Most of the storage arrays nowadays provide the feature of dynamic LUN expansion. This feature allows you to grow your existing volume on the fly without affecting existing data or I/O. Dynamic LUN expansion increases the capacity of the physical storage. You must then make Solaris-aware that the device has grown, and if a file system resides on the device, it must also be grown.
Before LUN expansion
1. Here is the disk that was used to create the zpool as seen in the format command output :
# format
< . . . .>
98. c7t600A0B80002FBC6700001AE352B29DDBd0 [SUN-LCSM100_F-0670 cyl 51198 alt 2 hd 64 sec 64] zfs-vol
/scsi_vhci/ssd@g600a0b80002fbc6700001ae352b29ddb
format> partition
partition> print
Part Tag Flag First Sector Size Last Sector
0 usr wm 256 99.99GB 209698782
2. Here are the sequence of commands used to create the zpool with the above disk :
# zpool create zfsvol c7t600A0B80002FBC6700001AE352B29DDBd0
# zpool list zfsvol
NAME SIZE ALLOC FREE CAP HEALTH ALTROOT
zfsvol 99.5G 79.5K 99.5G 0% ONLINE -
# df -k /zfsvol
Filesystem kbytes used avail capacity Mounted on
zfsvol 102703104 21 102703029 1% /zfsvol
After LUN expansion
There are 2 ways to do the expansion of zpool. The simple approach is to set the zpool autoexpand property to ON. The alternate method using format to repartition the disk device should only be used in the case of an older version of ZFS that does not support autoexpand.
Method 1 : zpool autoexpand
# zpool get autoexpand zfsvol
NAME PROPERTY VALUE SOURCE
zfsvol autoexpand off default
# zpool set autoexpand=on zfsvol
# zpool online -e zfsvol c7t600A0B80002FBC6700001AE352B29DDBd0
# zpool export zfsvol
# zpool import zfsvol
# zpool list zfsvol
NAME SIZE ALLOC FREE CAP HEALTH ALTROOT
zfsvol 150G 97.5K 149G 0% ONLINE -
Method 2 : repartition the disk
# NOINUSE_CHECK=1
# export NOINUSE_CHECK
# format -e c7t600A0B80002FBC6700001AE352B29DDBd0
selecting c7t600A0B80002FBC6700001AE352B29DDBd0: zfs-vol
format> type
AVAILABLE DRIVE TYPES:
0. Auto configure
1. other
Specify disk type (enter its number)[1]: 0
c7t600A0B80002FBC6700001AE352B29DDBd0: configured with capacity of 150.00GB
[SUN-LCSM100_F-0670-150.00GB]
format> partition
partition> 0
Enter partition id tag[usr]: [Enter]
Enter partition permission flags[wm]: [Enter]
Enter new starting Sector[34]: 256 (256 was the value prior to the expansion)
Enter partition size[314556349b, 314556604e, 153591mb, 149gb, 0tb]: $
partition> lab
[0] SMI Label
[1] EFI Label
Specify Label type[1]: 1
Ready to label disk, continue? yes
partition> quit
format> quit
# zpool online -e zfsvol c7t600A0B80002FBC6700001AE352B29DDBd0
# zpool list zfsvol
NAME SIZE ALLOC FREE CAP HEALTH ALTROOT
zfsvol 150G 147K 149G 0% ONLINE -
# df -k /zfsvol
Filesystem kbytes used avail capacity Mounted on
zfsvol 154312704 21 154312629 1% /zfsvol
The volume on the storage array has been expanded. Additional space has been given to the zpool.