Oracle ASMFD (ASM Filter Driver) is the replacement for ASMLIB in Oracle 12.1.0.2 and later, providing OS-level protection for ASM disk devices by filtering non-Oracle writes to ASM disks – preventing accidental or malicious overwrites. This article covers migrating an existing ASMLIB-based ASM environment to ASMFD: verifying the current ASMLIB configuration, creating a test table in an ASM tablespace to verify data integrity, labelling the disks for ASMFD, shutting down the cluster stack, running the migration, starting the stack with ASMFD, and validating that all disk groups are online and data is intact.<\/strong><\/p>\n\n\n\n Prior to Oracle Grid Infrastructure (GI) release 12.1.0.2, ASM Library (ASMLIB) was the only method to access storage devices by means of ASM Disks and Diskgroups. There were serious limitations to this method. The ASM disks were owned by GI home owner and both the owner and any users belonging to an operating system group designated as the OSASM group could read from and write to ASM disks using OS commands like strings, echo, dd etc. This led to compromising the security of data as well as accidental corruption of the data in the ASM disks and ASM disks themselves.<\/p>\n\n\n\n With Oracle Grid Infrastructure release 12.1.0.2, Oracle has introduced a new component called Oracle Automatic Storage Management Filter Driver (Oracle ASMFD) which is installed with an Oracle Grid Infrastructure installation. It is intended to overcome the limitations mentioned earlier and replace traditional ASMLIB. ASMFD is currently available only on the Linux operating system and can be completely managed by the ASMCMD command Line interface.<\/p>\n\n\n\n Oracle ASMFD is a kernel module that resides in the I\/O path of the Oracle ASM disks. ASMFD uses the filter driver to validate write I\/O requests to Oracle ASM disks. Any write I\/O requests that are not issued by Oracle software (e.g. using dd command) are not committed to ASM disks. Thus it helps to prevent users, including those with administrative privileges, from inadvertently overwriting Oracle ASM disks, thereby preventing corruption of the data stored on ASM disk(s) within the disk group(s). In case ASM disks have been configured on disk partitions, the filter protects the area on the disk managed by Oracle ASMFD, assuming the partition table is left untouched by the user.<\/p>\n\n\n\n Besides, Oracle ASMFD eliminates the need to rebind disk devices used with Oracle ASM each time the system is restarted.<\/p>\n\n\n\n If you have an existing Oracle ASM library driver (Oracle ASMLIB) configuration, and you want to employ ASMFD, you would need to configure Oracle ASMFD. This will remove Oracle ASMLIB and Oracle ASM devices will be configured to use Oracle ASMFD. In this article, I will demonstrate configuration of Oracle ASMFD in a standalone environment.<\/p>\n\n\n\n Currently, I have Oracle ASMLIB configured on my standalone system. OS user oracle is the owner of both GI home and Database home.<\/p>\n\n\n\n <\/a><\/p>\n\n\n\n We can verify that Oracle ASMLIB is configured and driver for oracleasm is currently loaded.<\/strong><\/p>\n\n\n\n Let\u2019s check the permissions and location of ASM Disks.<\/strong><\/p>\n\n\n\n The ASM Disks are block devices in \/dev\/oracleasm\/disks owned by the GI owner \u201coracle\u201d user. OS user oracle and anyone belonging to OS group \u201cdba\u201d (which maps to OSASM privilege) can read from and write to ASM disks. Thus the ASM disks are vulnerable to accidental Disk and or Data corruption.<\/p>\n\n\n\n We can verify that ASMFD is not configured.<\/strong><\/p>\n\n\n\n <\/a><\/p>\n\n\n\n Let\u2019s find out candidate disks which are not part of any disk group yet.<\/strong><\/p>\n\n\n\n <\/a><\/p>\n\n\n\n Let\u2019s find out disks in DATA and TEST disk groups<\/p>\n\n\n\n Let\u2019s make a note of current disk discovery path. It currently points to ASMLIB disks.<\/p>\n\n\n\n <\/a><\/p>\n\n\n\n Now, let\u2019s start with the migration. Once we label the disk, it will show up as AFD: and that name will be used for disk discovery.<\/p>\n\n\n\n AS GI owner , set the ASM discovery string to include AFD.* as well:<\/p>\n\n\n\n We have updated ASM disk discovery string. Now, when we configure ASMFD it would be able to discover and migrate the existing disks.<\/p>\n\n\n\n <\/a><\/p>\n\n\n\n Now, we are ready for the migration process. This step will deconfigure ASMLIB, configure ASMFD and migrate the disks from ASMLIB to ASMFD.<\/p>\n\n\n\n We can ignore the last error for now but we do have a working ASMFD now.<\/p>\n\n\n\n Note that the folder for oracleasm has been emptied and ASMFD has created a folder \/dev\/oracleafd where all the ASM disks are visible such that root is the owner of disks and only root can read from or write to ASM disks.<\/p>\n\n\n\n The disks can now be viewed from ASM Filter Driver Module.<\/p>\n\n\n\n We can verify that the configuration process has stopped the ASMLIB kernel module<\/p>\n\n\n\n We are almost done with the migration as ASMFD is loaded and the existing disks are already mapped. Once we start the Clusterware stack, we will update few configuration settings to make ASMFD persistent. We can verify that driver for ASMFD has been loaded.<\/p>\n\n\n\n <\/a><\/p>\n\n\n\n <\/a><\/p>\n\n\n\n Currently, parameter ASM_DISKSTRING points to both ASMLIB and ASMFD disks. Since ASMLIB has been deconfigured, we can remove ORCL:* from the parameter so that the parameter points to ASMFD disks only.<\/p>\n\n\n\n We can also set discovery string for ASMFD disks to \u2018AFD:*\u2019<\/p>\n\n\n\n <\/a><\/p>\n\n\n\n Validate if the diskgroups are migrated and using ASMFD<\/p>\n\n\n\n <\/a><\/p>\n\n\n\n Let\u2019s explore the disks located under \/dev\/oracleafd\/disks\/ .<\/p>\n\n\n\n These are actually just the text files owned by root pointing to the actual disks on which the ASM disks are configured as opposed to ASMLIB disks which were block devices owned by GI owner.<\/p>\n\n\n\n <\/a><\/p>\n\n\n\n We can check that filtering is enabled on AFD disks.<\/p>\n\n\n\n Now non-root users have no way to read directly from ASM disks using OS command \u201cstrings\u201d. Root user can still read the content of ASM disks cirectly.<\/p>\n\n\n\n For ASM disk writes, we get a layer of protection for both root and non-root users. I will demonstrate it for both \u201cecho<\/strong>\u201d and \u201cdd<\/strong>\u201d commands.<\/p>\n\n\n\n When we try to write to underlying disk using \u201cecho<\/strong>\u201d as a root user, although the echo command is successful, the I\/O were rejected by ASMFD which can be confirmed by looking into \/var\/log\/messages.<\/p>\n\n\n\n Similarly when we try to modify contents of ASM disk using \u2018dd<\/strong>\u2018 command, GI owner is denied permission where command succeeds for root without any effect though as can again be verified from \/var\/log\/messages.<\/p>\n\n\n\n Let us disable filter for all disks<\/p>\n\n\n\n Now that filter is disabled, let us try to perform write I\/O on ASMDISK10.<\/p>\n\n\n\n It can be seen although non-root user can still not write to ASM disk but root user can alter the contents of ASM Disks leading to corruption of Data in the ASM Disks and ASM disks themselves.<\/p>\n\n\n\n Oracle Automatic Storage Management Filter Driver (Oracle ASMFD) can overcome the limitations of and replace traditional ASMLIB. When filter is enabled,<\/p>\n\n\n\n \u2013 Contents of ASMFD disks can only be read using OS commands by root user<\/p>\n\n\n\n \u2013 Contents of ASMFD disks cannot be altered using OS commands by any user<\/p>\n\n\n\n Thus, any write I\/O performed to ASM disks by will be validated by the filter and corruption of data on ASM disks by non-oracle software will be eliminated. You may also be interested in:<\/strong> References:<\/strong><\/p>\n\n\n Oracle ASMFD (ASM Filter Driver) is a kernel module that sits between Oracle ASM and the operating system’s storage drivers, filtering out non-Oracle writes to ASM disk devices. ASMLIB (ASM Library) was the previous library-based approach for the same purpose – providing ASM disk discovery and protection. ASMFD replaces ASMLIB from Oracle Grid Infrastructure 12.1.0.2 onwards. Key differences: ASMFD is integrated with Oracle Grid Infrastructure (no separate ASMLIB RPM required), provides kernel-level filtering that ASMLIB does not, and supports AFD disk naming (AFD:diskname) for disk discovery.<\/p>\n <\/div>\n ASMLIB continues to work in Oracle 12.1.0.2+ – migration to ASMFD is not mandatory but is recommended for new installations. Oracle recommends ASMFD for new deployments, and some Oracle Engineered Systems require it. Migration is advisable when upgrading Grid Infrastructure versions as ASMLIB support may be deprecated in future releases. The migration requires a cluster stack downtime but is non-destructive to the ASM disk data.<\/p>\n <\/div>\n When ASMFD is configured, Oracle ASM disk devices are named with the AFD: prefix – for example, AFD:DATA_0001. This replaces the ORCL: prefix used by ASMLIB. The ASM_DISKSTRING parameter must be updated to ‘AFD:*’ to discover ASMFD disks, and AFD_DISKSTRING must also be set. The AFD: names appear in v$asm_disk and v$asm_diskgroup views after successful migration. Old ORCL: names in ASM_DISKSTRING should be removed after confirming all disks have migrated.<\/p>\n <\/div>\n Rolling back from ASMFD to ASMLIB is possible but complex – it requires bringing down the cluster stack, deconfiguring ASMFD, reconfiguring ASMLIB, updating the disk discovery parameters back to ORCL:*, and restarting the cluster. The ASM disk data itself is not modified during either migration direction, so the data is safe. However, a rollback should only be considered in a test environment or as an emergency measure – plan the migration thoroughly and test it in a non-production environment before applying to production.<\/p>\n <\/div>\n <\/section>\n","protected":false},"excerpt":{"rendered":" Migrate Oracle ASM storage from ASMLIB to Oracle ASMFD (ASM Filter Driver) in Oracle 12.1.0.2+. Complete step-by-step: verify ASMLIB, label disks, deconfigure ASMLIB, configure ASMFD, and validate the migrated disk groups.…<\/p>\n","protected":false},"author":316217,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[143533],"tags":[],"coauthors":[48555],"class_list":["post-73164","post","type-post","status-publish","format-standard","hentry","category-oracle-databases"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/posts\/73164","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/users\/316217"}],"replies":[{"embeddable":true,"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/comments?post=73164"}],"version-history":[{"count":8,"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/posts\/73164\/revisions"}],"predecessor-version":[{"id":110869,"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/posts\/73164\/revisions\/110869"}],"wp:attachment":[{"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/media?parent=73164"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/categories?post=73164"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/tags?post=73164"},{"taxonomy":"author","embeddable":true,"href":"https:\/\/www.red-gate.com\/simple-talk\/wp-json\/wp\/v2\/coauthors?post=73164"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Overview:<\/h2>\n\n\n
\n
\n
Implementation:<\/h2>\n\n\n\n
Verify that currently ASMLIB has been configured and ASMFD is not configured yet<\/h3>\n\n\n\n
[root@host01 ~]# lsmod | grep oracle\n\noracleasm<\/span> 48660 1 \n\n[root@host01 ~]# oracleasm scandisks\n\n[root@host01 ~]# oracleasm listdisks\n\nASMDISK01\nASMDISK02\nASMDISK03\nASMDISK04\nASMDISK05\nASMDISK06\nASMDISK07\nASMDISK08\nASMDISK09\nASMDISK10<\/pre>\n\n\n\n[root@host01 disks]# ls -lrt \/dev\/oracleasm\/disks\ntotal 0\nbrw-rw---- 1 oracle dba 8, 6 Apr 20 11:02 ASMDISK01\nbrw-rw---- 1 oracle dba 8, 7 Apr 20 11:02 ASMDISK02\nbrw-rw---- 1 oracle dba 8, 8 Apr 20 11:02 ASMDISK03\nbrw-rw---- 1 oracle dba 8, 9 Apr 20 11:02 ASMDISK04\nbrw-rw---- 1 oracle dba 8, 10 Apr 20 11:02 ASMDISK05\nbrw-rw---- 1 oracle dba 8, 11 Apr 20 11:02 ASMDISK06\nbrw-rw---- 1 oracle dba 8, 12 Apr 20 11:02 ASMDISK07\nbrw-rw---- 1 oracle dba 8, 13 Apr 20 11:02 ASMDISK08\nbrw-rw---- 1 oracle dba 8, 14 Apr 20 11:02 ASMDISK09\nbrw-rw---- 1 oracle dba 8, 15 Apr 20 11:02 ASMDISK10<\/pre>\n\n\n\n
[oracle@host01 ~]$ asmcmd afd_lsdsk\nFailed to load AFD library.<\/span>\n\n[oracle@host01 disks]$ asmcmd afd_state\n\nASMCMD-9526: The AFD state is 'NOT INSTALLED' and filtering is 'DEFAULT' on host \n'host01.example.com'<\/span>\n\nASM>SELECT SYS_CONTEXT('SYS_ASMFD_PROPERTIES', 'AFD_STATE') FROM DUAL;\n\nSYS_CONTEXT('SYS_ASMFD_PROPERTIES','AFD_STATE')\n--------------------------------------------------------------------------------\nNOT AVAILABLE<\/span>\n<\/pre>\n\n\n\nCreate a table in an ASM tablespace<\/h3>\n\n\n\n
[oracle@host01 ~]$ asmcmd lsdsk --candidate\nPath\nORCL:ASMDISK05\nORCL:ASMDISK06\nORCL:ASMDISK07\nORCL:ASMDISK08\nORCL:ASMDISK09\nORCL:ASMDISK10\n\n\nASM> create diskgroup test external redundancy disk 'ORCL:ASMDISK10';\n\nORCL>create tablespace ASMTBS datafile '+TEST';\n\nORCL>create table hr.asm_tab tablespace ASMTBS as select * from hr.employees;\n\n select count(*) from hr.asm_tab where last_name = 'King';\n\n COUNT(*)\n----------\n 2\n<\/pre>\n\n\n\n
Migrate ASM disks to use ASMFD<\/h3>\n\n\n\n
[oracle@host01 disks]$ asmcmd lsdsk -G DATA\nPath\nORCL:ASMDISK01\nORCL:ASMDISK02\nORCL:ASMDISK03\nORCL:ASMDISK04\n\n[oracle@host01 disks]$ asmcmd lsdsk -G TEST\n\nPath\nORCL:ASMDISK10<\/pre>\n\n\n\n
[oracle@host01 disks]$ asmcmd dsget\nparameter:ORCL:*<\/span>\nprofile:ORCL:*<\/pre>\n\n\n\nMake sure ASM is using SPFILE<\/h4>\n\n\n\n
[oracle@host01 disks]$ srvctl config asm\n\nASM home: \nPassword file: +DATA\/orapwasm\nASM listener: LISTENER\nSpfile: +DATA\/ASM\/ASMPARAMETERFILE\/registry.253.872686839<\/span>\nASM diskgroup discovery string: ORCL:*\n<\/pre>\n\n\n\n
<\/a><\/p>\n\n\n\nUpdate the ASM Disk discovery path to enable ASMFD lookup<\/h4>\n\n\n\n
[oracle@host01 root]$ asmcmd dsset 'ORCL:*','AFD:*'\n\n[oracle@host01 disks]$ asmcmd dsget\n\nparameter:ORCL:*, AFD:*\nprofile:ORCL:*,AFD:*<\/pre>\n\n\n\n
Bring down the Clusterware stack<\/h4>\n\n\n\n
ORCL>shu immediate;\n\n[root@host01 dev]# srvctl stop asm -f\n [root@host01 dev]# crsctl stop has\nCRS-2791: Starting shutdown of Oracle High Availability Services-managed resources on 'host01'\nCRS-2673: Attempting to stop 'ora.evmd' on 'host01'\nCRS-2673: Attempting to stop 'ora.LISTENER.lsnr' on 'host01'\nCRS-2677: Stop of 'ora.LISTENER.lsnr' on 'host01' succeeded\nCRS-2677: Stop of 'ora.evmd' on 'host01' succeeded\nCRS-2673: Attempting to stop 'ora.cssd' on 'host01'\nCRS-2677: Stop of 'ora.cssd' on 'host01' succeeded\nCRS-2793: Shutdown of Oracle High Availability Services-managed resources on 'host01' has completed\nCRS-4133: Oracle High Availability Services has been stopped.\n<\/pre>\n\n\n\n
<\/a><\/p>\n\n\n\nConfigure ASMFD<\/h3>\n\n\n\n
[root@host01 ~]# asmcmd afd_configure\n\nConnected to an idle instance.\nAFD-627: AFD distribution files found.\nAFD-636: Installing requested AFD software.\nAFD-637: Loading installed AFD drivers.\nAFD-9321: Creating udev for AFD.\nAFD-9323: Creating module dependencies - this may take some time.\nAFD-9154: Loading 'oracleafd.ko' driver.\nAFD-649: Verifying AFD devices.\nAFD-9156: Detecting control device '\/dev\/oracleafd\/admin'.\nAFD-638: AFD installation correctness verified.\nModifying resource dependencies - this may take some time.\nASMCMD-9524: AFD configuration failed 'ERROR: OHASD start failed'\nModifying resource dependencies - this may take some time.\nASMCMD-9524: AFD configuration failed 'ERROR: OHASD start failed'<\/pre>\n\n\n\n
[root@host01 ~]# asmcmd afd_state\n\nConnected to an idle instance.\n\nASMCMD-9526: The AFD state is 'LOADED' and filtering is 'DEFAULT' on host 'host01.example.com'<\/span><\/pre>\n\n\n\n[[root@host01 dev]# cd \/dev\n ls -l |grep oraclea\n\ndrwxrwx--- 3 oracle dba 80 Apr 20 17:22 oracleafd<\/span>\ndrwxr-xr-x 2 root root 40 Apr 20 17:15 oracleasm\n\n[root@host01 oracleasm]# ls -l \/dev\/oracleasm\/*\n\nls: \/dev\/oracleasm\/*: No such file or directory<\/span>\n\n\n[root@host01 dev]# ls -l \/dev\/oracleafd\/disks\ntotal 40\n-rw-r--r-- 1 root root<\/span> 10 Apr 20 17:22 ASMDISK01\n-rw-r--r-- 1 root root<\/span> 10 Apr 20 17:22 ASMDISK02\n-rw-r--r-- 1 root root<\/span> 10 Apr 20 17:22 ASMDISK03\n-rw-r--r-- 1 root root<\/span> 10 Apr 20 17:22 ASMDISK04\n-rw-r--r-- 1 root root<\/span> 11 Apr 20 17:22 ASMDISK05\n-rw-r--r-- 1 root root<\/span> 11 Apr 20 17:22 ASMDISK06\n-rw-r--r-- 1 root root<\/span> 11 Apr 20 17:22 ASMDISK07\n-rw-r--r-- 1 root root<\/span> 11 Apr 20 17:22 ASMDISK08\n-rw-r--r-- 1 root root<\/span> 11 Apr 20 17:22 ASMDISK09\n-rw-r--r-- 1 root root<\/span> 11 Apr 20 17:22 ASMDISK10<\/pre>\n\n\n\n[root@host01 oracleasm]# asmcmd afd_lsdsk\nConnected to an idle instance.\n--------------------------------------------------------------------------------\nLabel Filtering Path\n================================================================================\nASMDISK01 ENABLED \/dev\/sda6\nASMDISK02 ENABLED \/dev\/sda7\nASMDISK03 ENABLED \/dev\/sda8\nASMDISK04 ENABLED \/dev\/sda9\nASMDISK05 ENABLED \/dev\/sda10\nASMDISK06 ENABLED \/dev\/sda11\nASMDISK07 ENABLED \/dev\/sda12\nASMDISK08 ENABLED \/dev\/sda13\nASMDISK09 ENABLED \/dev\/sda14\nASMDISK10 ENABLED \/dev\/sda15\n<\/pre>\n\n\n\n
[root@host01 dev]# service oracleasm status\n\nChecking if ASM is loaded: no<\/span>\nChecking if \/dev\/oracleasm is mounted: no<\/span><\/pre>\n\n\n\n
<\/a><\/p>\n\n\n\nStart Clusterware stack<\/h3>\n\n\n\n
[root@host01 disks]# crsctl start has\nCRS-4123: Oracle High Availability Services has been started.<\/pre>\n\n\n\n
root@host01 oracleasm]# lsmod | grep oracle\n\noracleafd<\/span> 221120 1\n\nroot@host01 dev]# srvctl start asm\n<\/pre>\n\n\n\nVerify that ASMFD has been successfully configured and ASM disks have been migrated<\/h3>\n\n\n\n
ASM> SELECT SYS_CONTEXT('SYS_ASMFD_PROPERTIES', 'AFD_STATE') FROM DUAL;\n\nSYS_CONTEXT('SYS_ASMFD_PROPERTIES','AFD_STATE')\n----------------------------------------------------------------------------------------------------------- \n CONFIGURED<\/span>\n\n\nASM> select name, path, total_mb, free_mb from v$asm_disk;\n \n\nNAME PATH TOTAL_MB FREE_MB\n--------------- -------------------- ---------- ----------\n AFD:ASMDISK09 0 0\n AFD:ASMDISK08 0 0\n AFD:ASMDISK05 0 0\n AFD:ASMDISK07 0 0\n AFD:ASMDISK06 0 0\nASMDISK01 AFD:ASMDISK01 3914 3865\nASMDISK02 AFD:ASMDISK02 3914 3862\nASMDISK03 AFD:ASMDISK03 3914 3867\nASMDISK04 AFD:ASMDISK04 3914 3871\nASMDISK10 AFD:ASMDISK10 3914 3761\n<\/pre>\n\n\n\nSet ASM_DISKSTRING and AFD_DISKSTRING to \u2018AFD:*\u2019<\/h3>\n\n\n\n
ASMFD disks only. \nASM>sho parameter diskstring\n\nNAME TYPE VALUE\n------------------------------------ ----------- ------------------------------\nasm_diskstring string ORCL:*, AFD:*<\/span>\n\n[oracle@host01 ~]$ asmcmd dsget\n\nparameter:ORCL:*, AFD:*<\/span>\nprofile:ORCL:*,AFD:*\n\nASM>ALTER SYSTEM set asm_diskstring = 'AFD:*';\n\n[oracle@host01 ~]$ asmcmd dsget\n\nparameter:AFD:*<\/span>\nprofile:AFD:*\n<\/pre>\n\n\n\nASM>ALTER SYSTEM AFD_DISKSTRING SET 'AFD:*';\n\n[oracle@host01 ~]$ asmcmd afd_dsget\n\nAFD discovery string: 'AFD:*'<\/span>\n\nASM>SELECT SYS_CONTEXT('SYS_ASMFD_PROPERTIES', 'AFD_DISKSTRING') FROM DUAL;\n\nSYS_CONTEXT('SYS_ASMFD_PROPERTIES','AFD_DISKSTRING')\n----------------------------------------------------------------------------------------------------------- \n\n'AFD:*'<\/span>\n\n[oracle@host01 ~]$ srvctl config asm\n\nASM home: \nPassword file: +DATA\/orapwasm\nASM listener: LISTENER\nSpfile: +DATA\/ASM\/ASMPARAMETERFILE\/registry.253.872686839\nASM diskgroup discovery string: AFD:*<\/span>\n<\/pre>\n\n\n\nValidate that ASM Diskgroups have migrated and are using ASMFD<\/h3>\n\n\n\n
[oracle@host01 ~]$ srvctl status diskgroup -diskgroup DATA\nDisk Group DATA is running on host01<\/span>\n\n[oracle@host01 ~]$ srvctl status diskgroup -diskgroup TEST\nDisk Group TEST is running on host01<\/span>\n<\/pre>\n\n\n\n[oracle@host01 ~]$ asmcmd lsdsk -G DATA\n\nPath\nAFD:ASMDISK01\nAFD:ASMDISK02\nAFD:ASMDISK03\nAFD:ASMDISK04\n\n[oracle@host01 ~]$ asmcmd lsdsk -G TEST\n\nPath\nAFD:ASMDISK10\n\nroot@host01 disks]# crsctl stat res -t\n\n--------------------------------------------------------------------------------\nName Target State Server State details \n--------------------------------------------------------------------------------\nLocal Resources\n--------------------------------------------------------------------------------\nora.DATA.dg<\/span>\n ONLINE ONLINE<\/span> host01<\/span> STABLE<\/span>\nora.LISTENER.lsnr\n ONLINE ONLINE host01 STABLE\nora.TEST.dg<\/span>\n OFFLINE OFFLINE<\/span> host01<\/span> STABLE<\/span>\nora.asm\n ONLINE ONLINE host01 Started,STABLE\nora.ons\n OFFLINE OFFLINE host01 STABLE\n--------------------------------------------------------------------------------\nCluster Resources\n--------------------------------------------------------------------------------\nora.cssd\n 1 ONLINE ONLINE host01 STABLE\nora.diskmon\n 1 OFFLINE OFFLINE STABLE\nora.evmd\n 1 ONLINE ONLINE host01 STABLE\n-------------------------------------------------------------------------------\n\n\n\n[oracle@host01 ~]$ asmcmd afd_scan\n[oracle@host01 ~]$ asmcmd afd_lsdsk\n--------------------------------------------------------------------------------\nLabel Filtering Path\n================================================================================\nASMDISK01 ENABLED \/dev\/sda6\nASMDISK02 ENABLED \/dev\/sda7\nASMDISK03 ENABLED \/dev\/sda8\nASMDISK04 ENABLED \/dev\/sda9\nASMDISK05 ENABLED \/dev\/sda10\nASMDISK06 ENABLED \/dev\/sda11\nASMDISK07 ENABLED \/dev\/sda12\nASMDISK08 ENABLED \/dev\/sda13\nASMDISK09 ENABLED \/dev\/sda14\nASMDISK10 ENABLED \/dev\/sda15\n<\/pre>\n\n\n\nVerify that our data is intact after migration<\/h3>\n\n\n\n
ORCL> select tablespace_name, file_name from dba_data_files where tablespace_name = 'ASMTBS' ;\n\nTABLESPACE_NAME FILE_NAME\n------------------------------ ------------------------------\nASMTBS +TEST\/ORCL\/DATAFILE\/asmtbs.256.877540769\n\nORCL> select count(*) from hr.asm_tab where last_name = 'King';\n\n COUNT(*)\n----------\n 2\n<\/pre>\n\n\n\n
[root@host01 disks]# file \/dev\/oracleafd\/disks\/ASM*\n\n\/dev\/oracleafd\/disks\/ASMDISK01: ASCII text<\/span>\n\/dev\/oracleafd\/disks\/ASMDISK02: ASCII text<\/span>\n\/dev\/oracleafd\/disks\/ASMDISK03: ASCII text<\/span>\n\/dev\/oracleafd\/disks\/ASMDISK04: ASCII text<\/span>\n\/dev\/oracleafd\/disks\/ASMDISK05: ASCII text<\/span>\n\/dev\/oracleafd\/disks\/ASMDISK06: ASCII text<\/span>\n\/dev\/oracleafd\/disks\/ASMDISK07: ASCII text<\/span>\n\/dev\/oracleafd\/disks\/ASMDISK08: ASCII text<\/span>\n\/dev\/oracleafd\/disks\/ASMDISK09: ASCII text<\/span>\n\n[root@host01 disks]# ls -l \/dev\/oracleafd\/disks\/ASM*\ntotal 40\n-rw-r--r-- 1 root root<\/span> 10 Apr 20 17:22 ASMDISK01\n-rw-r--r-- 1 root root<\/span> 10 Apr 20 17:22 ASMDISK02\n-rw-r--r-- 1 root root<\/span> 10 Apr 20 17:22 ASMDISK03\n-rw-r--r-- 1 root root<\/span> 10 Apr 20 17:22 ASMDISK04\n-rw-r--r-- 1 root root<\/span> 11 Apr 20 17:22 ASMDISK05\n-rw-r--r-- 1 root root<\/span> 11 Apr 20 17:22 ASMDISK06\n-rw-r--r-- 1 root root<\/span> 11 Apr 20 17:22 ASMDISK07\n-rw-r--r-- 1 root root<\/span> 11 Apr 20 17:22 ASMDISK08\n-rw-r--r-- 1 root root<\/span> 11 Apr 20 17:22 ASMDISK09\n-rw-r--r-- 1 root root<\/span> 11 Apr 20 17:22 ASMDISK10\n\n[root@host01 disks]# cat \/dev\/oracleafd\/disks\/ASM*\n\n\/dev\/sda6\n\/dev\/sda7\n\/dev\/sda8\n\/dev\/sda9\n\/dev\/sda10\n\/dev\/sda11\n\/dev\/sda12\n\/dev\/sda13\n\/dev\/sda14\n\/dev\/sda15\n\n\n[root@host01 log]# ls -l \/dev\/sda*\n\nbrw-r----- 1 root disk 8, 0 Apr 20 17:14 \/dev\/sda\nbrw-r----- 1 root disk 8, 1 Apr 20 17:14 \/dev\/sda1\nbrw-r----- 1 root disk 8, 10 Apr 20 17:14 \/dev\/sda10\nbrw-r----- 1 root disk 8, 11 Apr 20 17:14 \/dev\/sda11\nbrw-r----- 1 root disk 8, 12 Apr 20 17:14 \/dev\/sda12\nbrw-r----- 1 root disk 8, 13 Apr 20 17:14 \/dev\/sda13\nbrw-r----- 1 root disk 8, 14 Apr 20 17:14 \/dev\/sda14\nbrw-r----- 1 root disk 8, 15 Apr 27 11:23 \/dev\/sda15\nbrw-r----- 1 root disk 8, 2 Apr 20 17:14 \/dev\/sda2\nbrw-r----- 1 root disk 8, 3 Apr 20 17:14 \/dev\/sda3\nbrw-r----- 1 root disk 8, 4 Apr 20 17:14 \/dev\/sda4\nbrw-r----- 1 root disk 8, 5 Apr 20 17:14 \/dev\/sda5\nbrw-r----- 1 root disk 8, 6 Apr 27 10:52 \/dev\/sda6\nbrw-r----- 1 root disk 8, 7 Apr 20 17:14 \/dev\/sda7\nbrw-r----- 1 root disk 8, 8 Apr 20 17:14 \/dev\/sda8\nbrw-r----- 1 root disk 8, 9 Apr 20 17:14 \/dev\/sda9\n<\/pre>\n\n\n\nVerify that when filter is enabled it does not allow OS commands to alter the contents of ASM disks<\/h3>\n\n\n\n
[oracle@host01 ~]$ asmcmd afd_scan\n[oracle@host01 ~]$ asmcmd afd_lsdsk\n--------------------------------------------------------------------------------\nLabel Filtering Path\n================================================================================\nASMDISK01 ENABLED<\/span> \/dev\/sda6\nASMDISK02 ENABLED<\/span> \/dev\/sda7\nASMDISK03 ENABLED<\/span> \/dev\/sda8\nASMDISK04 ENABLED<\/span> \/dev\/sda9\nASMDISK05 ENABLED<\/span> \/dev\/sda10\nASMDISK06 ENABLED<\/span> \/dev\/sda11\nASMDISK07 ENABLED<\/span> \/dev\/sda12\nASMDISK08 ENABLED<\/span> \/dev\/sda13\nASMDISK09 ENABLED<\/span> \/dev\/sda14\nASMDISK10 ENABLED<\/span> \/dev\/sda15\n<\/pre>\n\n\n\n[oracle<\/span>@host01 disks]$ strings \/dev\/sda15 | grep King\n\nstrings: \/dev\/sda15: Permission denied<\/span>\n\n[root<\/span>@host01 log]# strings \/dev\/sda15 | grep King\n\nKing<\/span>\nKing<\/span>\n<\/pre>\n\n\n\n[oracle<\/span>@host01 disks]$ echo 'corrupt' > \/dev\/sda15\n\nbash: \/dev\/sda15: Permission denied<\/span><\/pre>\n\n\n\n[root<\/span>@host01 log]# echo 'corrupt' > \/dev\/sda15\n\n[root@host01 log]# more \/var\/log\/messages\n\n....\n\nquest_fn: write IO on ASM managed device (major=8\/minor=15) not supported i<\/span>=10 \nstart=186868143 seccnt=4 \n\npstart=186868143 pend=194884515\nApr 27 11:28:51 host01 kernel: Buffer I\/O error on device sda15, logical block 0\n\nApr 27 11:28:51 host01 kernel: lost page write due to I\/O error on sda15<\/span>\n....\n<\/pre>\n\n\n\n[oracle<\/span>@host01 disks]$ dd if=\/dev\/zero of=\/dev\/sda6 count=100 bs=2M\n dd: opening `\/dev\/sda6': Permission denied<\/span>\n[root<\/span>@host01 log]# dd if=\/dev\/zero of=\/dev\/sda15 count=10 bs=2M\n10+0 records in\n10+0 records out\n20971520 bytes (21 MB) copied, 0.013702 seconds, 1.5 GB\/s<\/span>\n[root@host01 log]# more \/var\/log\/messages\n...\nApr 27 11:34:06 host01 kernel: F 4306319.693\/150427060406 pdflush[363] afd_mkrequest_fn: write IO on ASM managed device (major=8\/minor=15) not supported<\/span> i=10 start=186868143 seccnt=4 pstart=186868143 pend=194884515<\/pre>\n\n\n\n[oracle@host01 root]$ asmcmd afd_filter -d\n[oracle@host01 root]$ asmcmd afd_lsdsk\n--------------------------------------------------------------------------------\nLabel Filtering Path\n================================================================================\nASMDISK01 DISABLED<\/span> \/dev\/sda6\nASMDISK02 DISABLED<\/span> \/dev\/sda7\nASMDISK03 DISABLED<\/span> \/dev\/sda8\nASMDISK04 DISABLED<\/span> \/dev\/sda9\nASMDISK05 DISABLED<\/span> \/dev\/sda10\nASMDISK06 DISABLED<\/span> \/dev\/sda11\nASMDISK07 DISABLED<\/span> \/dev\/sda12\nASMDISK08 DISABLED<\/span> \/dev\/sda13\nASMDISK09 DISABLED<\/span> \/dev\/sda14\nASMDISK10 DISABLED<\/span> \/dev\/sda15\n<\/pre>\n\n\n\n[oracle<\/span>@host01 disks]$ echo 'corrupt' > \/dev\/sda15\n\nbash: \/dev\/sda15: Permission denied<\/span>\n\n[root<\/span>@host01 log]# echo 'corrupt' > \/dev\/sda15\n\n[root@host01 ~]# strings \/dev\/sda15 | grep corrupt\n\ncorrupt<\/span>\n\n[oracle<\/span>@host01 disks]$ dd if=\/dev\/zero of=\/dev\/sda15 count=100 bs=2M\n\n dd: opening `\/dev\/sda6': Permission denied<\/span>\n \n[root<\/span>@host01 ~]# dd if=\/dev\/zero of=\/dev\/sda15 count=1000 bs=2M\n1000+0 records in\n1000+0 records out\n2097152000 bytes (2.1 GB) copied, 4.38152 seconds, 479 MB\/s<\/span>\n\nORCL>alter system flush buffer_cache;\n\nSystem altered.\n\nORCL>select count(*) from hr.asm_tab where last_name = 'King';\n\nselect count(*) from hr.asm_tab where last_name = 'King'\n *\nERROR at line 1:\nORA-01578: ORACLE data block corrupted (file # 2, block # 130)<\/span>\nORA-01110: data file 2: '+TEST\/ORCL\/DATAFILE\/asmtbs.256.877540769'<\/span>\nASM>select name, STATE from v$asm_diskgroup;\n\nNAME STATE\n------------------------------ -----------\nDATA MOUNTED\n\nASM>alter diskgroup test mount;\nalter diskgroup test mount\n*\nERROR at line 1:\nORA-15032: not all alterations performed\nORA-15017: diskgroup \"TEST\" cannot be mounted<\/span>\nORA-15040: diskgroup is incomplete\n\nASM> select name, path, total_mb, free_mb from v$asm_disk; \n\nNAME PATH TOTAL_MB FREE_MB\n--------------- -------------------- ---------- ----------\n AFD:ASMDISK10 0 0<\/span>\n AFD:ASMDISK09 0 0\n AFD:ASMDISK08 0 0\n AFD:ASMDISK05 0 0\n AFD:ASMDISK07 0 0\n AFD:ASMDISK06 0 0\nASMDISK01 AFD:ASMDISK01 3914 3865\nASMDISK02 AFD:ASMDISK02 3914 3862\nASMDISK03 AFD:ASMDISK03 3914 3867\nASMDISK04 AFD:ASMDISK04 3914 3871\n\n10 rows selected.\n<\/pre>\n\n\n\nConclusion:<\/h2>\n\n\n\n
<\/p>\n\n\n\n
Converting Oracle single instance to RAC where ASM storage configuration is required<\/a><\/p>\n\n<\/div>\n<\/div> \n\n\n\n
FAQs: Oracle Automatic Storage Management Filter Driver (Oracle ASMFD)<\/h2>\n\n
1. What is Oracle ASMFD and how is it different from ASMLIB?<\/h3>\n
2. Is migration from ASMLIB to ASMFD required in Oracle 12.1.0.2+?<\/h3>\n
3. What does the AFD disk naming convention mean in Oracle ASMFD?<\/h3>\n
4. Can I roll back from ASMFD to ASMLIB?<\/h3>\n