Starting
12.1.0.2 we can use ASM Filter Drive (ASMFD) to create ASM disks to be used for
ASM diskgroups. I have already explain in this article that how we configure ASMFD during
GI installation, and this article for migration from ASMLib to ASMFD. In this article I will show you
how to create/add new ASM disks using ASMFD so that we can use them for
existing or new diskgroups.
Currently I have
a disk /dev/sdb1 that is already configured using ASMFD, and now I have a new
physical disk /dev/sdc1 that I will be configuring using ASMFD. On asmcmd
prompt, if you issue command “help”, you will see list of options starting with
“afd” and all these options are available for using ASM Filter Driver
afd_configure, afd_deconfigure,
afd_di, afd_dsget, afd_dsset, afd_filter, afd_label, afd_lsdsk, afd_lslbl,
afd_refresh, afd_scan, afd_state,
afd_unlabel
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You can further
issue help command for each of these options to find out the detailed working
of that option.
ASMCMD> help afd_label
afd_label
To set the given label to the specified disk
Synopsis
afd_label <label> <disk> [--rename | --migrate] [--init]
Description
The options for the afd_label command are described below.
'--init' option is not allowed if AFD is already loaded.
label - label
for the disk
disk - disk
path
--rename - to
relabel a disk that was labeled earlier
--migrate - to label a disk that was provisioned
for ASM
--init - to set
AFD label during initialize stage
Examples
The following example labels a disk /dev/sdq with label DATA1.
ASMCMD [+] >afd_label DATA1 /dev/sdq
See Also
afd_unlabel afd_lsdsk
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I will be using
afd_label option to label my new disk so that it can be used by ASM.
As root, execute following command
As root, execute following command
[root@salman11 disks]#
/u01/app/12.2.0/grid/bin/asmcmd afd_label DATA2 /dev/sdc1
[root@salman11 disks]#
/u01/app/12.2.0/grid/bin/asmcmd afd_lslbl
--------------------------------------------------------------------------------
Label Duplicate Path
================================================================================
DATA
/dev/sdb1
DATA2 /dev/sdc1
-- Labeled disks are also visible at OS level jut like previously
we had /dev/oracleasm directory to view disks labeled using ASMLib
[root@salman11 disks]# ls -l
/dev/oracleafd/disks/
total 8
-rwxrwx---. 1 grid oinstall 10 Mar 22
12:38 DATA
-rwxrwx---. 1 grid oinstall 10 Mar 22
13:27 DATA2
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Immediately
after labelling, disk can be seen under V$ASM_DISK view and can be made part of
a diskgroup. Log in as SYSASM and execute following. DATA2 is the newly labelled
disk.
SQL> conn sys as sysasm
Enter password:
Connected.
SQL> select path from v$asm_disk;
PATH
--------------------------------------------------------------------------------
AFD:DATA2
AFD:DATA
SQL> alter diskgroup data add disk 'AFD:DATA2';
Diskgroup altered.
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If disk is still
not visible in V$ASM_DISK, you can execute “afd_scan” and disk should be
visible now.
Removing Labels of Disk(s)
If you want to
remove a disk from ASM, drop it from the ASM diskgroup first (if it is part of
an ASM diskgroup), and then un-label it using ASMFD
-- Drop disk from diskgroup if disk is part of a diskgroup
(connect as SYSASM).
SQL> alter diskgroup data drop disk DATA2;
Diskgroup altered.
-- As root, unlabel the disk
[root@salman11 disks]# /u01/app/12.2.0/grid/bin/asmcmd afd_unlabel DATA2
[root@salman11 disks]#
/u01/app/12.2.0/grid/bin/asmcmd afd_lslbl
--------------------------------------------------------------------------------
Label Duplicate Path
=====================================================================
DATA /dev/sdb1
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