Volume Management with asmcmd
July 17, 2011 Leave a Comment
Creating Volumes with the volcreate command
ASMCMD> volcreate -G lobdata -s 4g vol_lob2
Note:
You can not create a mirror or high redundancy volume on an external redundant disk group.
ASMCMD> volcreate -G lobdata -s 4g --redundancy mirror vol_lob2 ORA-15032: not all alterations performed ORA-15471: volume redundancy incompatible with diskgroup redundancy (DBD ERROR: OCIStmtExecute)
Displaying volume information with the volinfo command
With the -a option (and do not specify a diskgroup and volume), you will get a detailed information about every volume for every diskgroup
ASMCMD> volinfo -a
Diskgroup Name: DATA
Volume Name: VOL_LOGFILE
Volume Device: /dev/asm/vol_logfile-340
State: ENABLED
Size (MB): 3072
Resize Unit (MB): 256
Redundancy: UNPROT
Stripe Columns: 4
Stripe Width (K): 128
Usage: ACFS
Mountpath: /apps/oracle/acfsmounts/data_vol_logfile
Volume Name: VOL_RPTS
Volume Device: /dev/asm/vol_rpts-340
State: ENABLED
Size (MB): 5120
Resize Unit (MB): 256
Redundancy: UNPROT
Stripe Columns: 4
Stripe Width (K): 128
Usage: ACFS
Mountpath: /apps/oracle/acfsmounts/data_vol_rpts
Diskgroup Name: LOBDATA
Volume Name: VOL_LOB
Volume Device: /dev/asm/vol_lob-484
State: ENABLED
Size (MB): 4096
Resize Unit (MB): 256
Redundancy: UNPROT
Stripe Columns: 4
Stripe Width (K): 128
Usage: ACFS
Mountpath: /apps/oracle/acfsmounts/lobdata
Volume Name: VOL_LOB2
Volume Device: /dev/asm/vol_lob2-484
State: ENABLED
Size (MB): 4096
Resize Unit (MB): 256
Redundancy: UNPROT
Stripe Columns: 4
Stripe Width (K): 128
Usage:
Mountpath:
To display volume information for a specific diskgroup, use the -G option:
ASMCMD> volinfo -G lobdata -a
Diskgroup Name: LOBDATA
Volume Name: VOL_LOB
Volume Device: /dev/asm/vol_lob-484
State: ENABLED
Size (MB): 4096
Resize Unit (MB): 256
Redundancy: UNPROT
Stripe Columns: 4
Stripe Width (K): 128
Usage: ACFS
Mountpath: /apps/oracle/acfsmounts/lobdata
Volume Name: VOL_LOB2
Volume Device: /dev/asm/vol_lob2-484
State: ENABLED
Size (MB): 4096
Resize Unit (MB): 256
Redundancy: UNPROT
Stripe Columns: 4
Stripe Width (K): 128
Usage:
Mountpath:
To display volume information for a specific volume, use the -G option followed by the volume name of interest:
ASMCMD> volinfo -G DATA VOL_RPTS
Diskgroup Name: DATA
Volume Name: VOL_RPTS
Volume Device: /dev/asm/vol_rpts-340
State: ENABLED
Size (MB): 5120
Resize Unit (MB): 256
Redundancy: UNPROT
Stripe Columns: 4
Stripe Width (K): 128
Usage: ACFS
Mountpath: /apps/oracle/acfsmounts/data_vol_rpts
You can reverse query based on a volume device and lookup the volume information:
ASMCMD> volinfo --show_volume /dev/asm/vol_lob2-484 vol_lob2
Likewise, you can reverse lookup the disk group information based on the volume device:
ASMCMD> volinfo --show_diskgroup /dev/asm/vol_lob2-484 lobdata
Report volume I/O statistics
ASMCMD> volstat -G data
DISKGROUP NUMBER / NAME: 1 / DATA
---------------------------------------
VOLUME_NAME
READS BYTES_READ READ_TIME READ_ERRS
WRITES BYTES_WRITTEN WRITE_TIME WRITE_ERRS
-------------------------------------------------------------
VOL_LOGFILE
49862 3219816448 37565 0
3349 167577600 80043 0
VOL_RPTS
125 71168 306 0
10 12288 90 0
If the –show_volume is not specified, I/O statistics for all volumes of the disk group are displayed. To display a specific volume, use the show_volume parameter as shown below:
ASMCMD> volstat -G data --show_volume vol_logfile
DISKGROUP NUMBER / NAME: 1 / DATA
---------------------------------------
VOLUME_NAME
READS BYTES_READ READ_TIME READ_ERRS
WRITES BYTES_WRITTEN WRITE_TIME WRITE_ERRS
-------------------------------------------------------------
VOL_LOGFILE
49862 3219816448 37565 0
3349 167577600 80043 0
Enable/Disable a volume
ASMCMD> voldisable -G lobdata vol_lob2 ASMCMD> ASMCMD> volenable -G lobdata vol_lob2 ASMCMD> voldisable -G lobdata vol_lob2
Use the -a option to enable all the volumes for the disk gruop
ASMCMD> volenable -G lobdata -a
Note:
You cannot disable a volume that is currently being accessed:
ASMCMD> voldisable -G lobdata vol_lob ORA-15032: not all alterations performed ORA-15468: volume 'VOL_LOB' in diskgroup 'LOBDATA' is currently being accessed (DBD ERROR: OCIStmtExecute) Resizing an existing volume [code language='sql'] ASMCMD> volresize -G LOBDATA -s 5G VOL_LOB2 ASMCMD> volresize -G LOBDATA -s 2G VOL_LOB2 The volume is not ACFS and the requested size is smaller than the current size. Data corruption may occur. Are you sure? [y/n]: y
Note:
You cannot volresize a volume that is being accessed. I wish the error message was more accurate.
ASMCMD> volresize -G LOBDATA -s 5G VOL_LOB ORA-15032: not all alterations performed ORA-15476: resize of ACFS volume must use ACFS resize command (DBD ERROR: OCIStmtExecute)
Deleting an existing volume from a disk group
You can use the voldelete command followed by the -G option for the diskgroup followed by the volume name to drop a volume from the diskgroup
ASMCMD> voldelete -G lobdata VOL_LOB2
You can set attributes for volumes. The attributes that are available are:
1. --usagestring
2. --mountpath
These attributes are information only and used for informational purposes only by ASM and not used by ASM. Here's couple of examples with volset
[oracle@jin1 ~]$ asmcmd volset -G data --usagestring 'To Store temporary reports' VOL_RPTS
[oracle@jin1 ~]$ asmcmd volset -G data --mountpath 'We should mount this volume as /data/reports' VOL_RPTS
[oracle@jin1 ~]$ asmcmd volinfo -G data VOL_RPTS
Diskgroup Name: DATA
Volume Name: VOL_RPTS
Volume Device: /dev/asm/vol_rpts-340
State: ENABLED
Size (MB): 5120
Resize Unit (MB): 256
Redundancy: UNPROT
Stripe Columns: 4
Stripe Width (K): 128
Usage: To Store temporary reports
Mountpath: We should mount this volume as /data/reports
Posted by Charles Kim, Oracle ACE