This is tested on AIX 6.1. When you try to add a disk to an existing VG, by doing:
#extendvg vgdata hdisk20
you may receive the following error message:
0516-1714 /usr/sbin/extendvg: The total number of partitions on the disks for this volume group would be 184302, which exceeds the current maxpps value of 131072. Increase the maxpps value to 262144 using the chvg -P command, then retry. 0516-792 /usr/sbin/extendvg: Unable to extend volume group"
The cause?
bash-3.00# lsvg vgdata VOLUME GROUP: vgdata VG IDENTIFIER: 00c39a0200004c000000012bb22891c2 VG STATE: active PP SIZE: 8 megabyte(s) VG PERMISSION: read/write TOTAL PPs: 122871 (182952 megabytes) MAX LVs: 256 FREE PPs: 1 (8 megabytes) LVs: 2 USED PPs: 111870 (982960 megabytes) OPEN LVs: 2 QUORUM: 2 (Enabled) TOTAL PVs: 2 VG DESCRIPTORS: 3 STALE PVs: 0 STALE PPs: 0 ACTIVE PVs: 2 AUTO ON: yes MAX PPs per VG: 131072 MAX PVs: 1024 LTG size (Dynamic): 256 kilobyte(s) AUTO SYNC: no HOT SPARE: no
As you can see, the current maxpps per vg for the vgdata volume group is 131072 pps, and to increase the size of the vg from 1TB to 1.5TB requires 184302. To solve this problem, we need to increase the value of the maxpps parameter for the vgdata volume group. Just follow the on screen clue to perform:
#chvg -P 262144 vgdata
Now, make sure that the maxpps value has been altered:
bash-3.00# lsvg dumpvg VOLUME GROUP: dumpvg VG IDENTIFIER: 00c39a0200004c000000012bb22891c2 VG STATE: active PP SIZE: 8 megabyte(s) VG PERMISSION: read/write TOTAL PPs: 122871 (182952 megabytes) MAX LVs: 256 FREE PPs: 1 (8 megabytes) LVs: 2 USED PPs: 122870 (982960 megabytes) OPEN LVs: 2 QUORUM: 2 (Enabled) TOTAL PVs: 2 VG DESCRIPTORS: 3 STALE PVs: 0 STALE PPs: 0 ACTIVE PVs: 2 AUTO ON: yes MAX PPs per VG: 262144 MAX PVs: 1024 LTG size (Dynamic): 256 kilobyte(s) AUTO SYNC: no HOT SPARE: no BB POLICY: relocatable
Add the new disk to the vg:
#extendvg vgdata hdisk20
The number of free PPs should be increased
bash-3.00# lsvg vgdata VOLUME GROUP: vgdata VG IDENTIFIER: 00c39a0200004c000000012bb22891c2 VG STATE: active PP SIZE: 8 megabyte(s) VG PERMISSION: read/write TOTAL PPs: 184302 (1474416 megabytes) MAX LVs: 256 FREE PPs: 61432 (491456 megabytes) LVs: 2 USED PPs: 122870 (982960 megabytes) OPEN LVs: 2 QUORUM: 2 (Enabled) TOTAL PVs: 2 VG DESCRIPTORS: 3 STALE PVs: 0 STALE PPs: 0 ACTIVE PVs: 2 AUTO ON: yes MAX PPs per VG: 262144 MAX PVs: 1024 LTG size (Dynamic): 256 kilobyte(s) AUTO SYNC: no HOT SPARE: no BB POLICY: relocatable
Next, to increase the size of the LV. Oops, another error:
0516-787 extendlv: Maximum allocation for logical volume fslv01 is 122869.
this is basically the same problem, but with lv instead of vg
bash-3.00# lslv fslv01
LOGICAL VOLUME: fslv01 VOLUME GROUP: vgdata
LV IDENTIFIER: 00c39a0200004c000000012bb22891c2.2 PERMISSION: read/write
VG STATE: active/complete LV STATE: opened/syncd
TYPE: jfs2 WRITE VERIFY: off
MAX LPs: 122869 PP SIZE: 8 megabyte(s)
COPIES: 1 SCHED POLICY: parallel
LPs: 122869 PPs: 122869
STALE PPs: 0 BB POLICY: relocatable
INTER-POLICY: minimum RELOCATABLE: yes
INTRA-POLICY: middle UPPER BOUND: 1024
MOUNT POINT: /dump LABEL: /dump
MIRROR WRITE CONSISTENCY: on/ACTIVE
EACH LP COPY ON A SEPARATE PV ?: yes
Serialize IO ?: NO
DEVICESUBTYPE : DS_LVZ
COPY 1 MIRROR POOL: None
COPY 2 MIRROR POOL: None
COPY 3 MIRROR POOL: None
The max lps value should be increased in accordance to the additional space that we are planning to add. In my case it’s 500GB. To translate that to PPs, divide the volume size that you want to add with the size of your PP size, in my case it’s 512000 / 8 = 64000. Edit the max LP value with chlv -x (current PP + additional PP):
#chlv -x 186869 fslv01
The LV should be ready to be resized
bash-3.00# lslv fslv01 LOGICAL VOLUME: fslv01 VOLUME GROUP: vgdata LV IDENTIFIER: 00c39a0200004c000000012bb22891c2.2 PERMISSION: read/write VG STATE: active/complete LV STATE: opened/syncd TYPE: jfs2 WRITE VERIFY: off MAX LPs: 186869 PP SIZE: 8 megabyte(s) COPIES: 1 SCHED POLICY: parallel LPs: 122869 PPs: 122869 STALE PPs: 0 BB POLICY: relocatable INTER-POLICY: minimum RELOCATABLE: yes INTRA-POLICY: middle UPPER BOUND: 1024 MOUNT POINT: /dump LABEL: /dump MIRROR WRITE CONSISTENCY: on/ACTIVE EACH LP COPY ON A SEPARATE PV ?: yes Serialize IO ?: NO DEVICESUBTYPE : DS_LVZ COPY 1 MIRROR POOL: None COPY 2 MIRROR POOL: None COPY 3 MIRROR POOL: None
We should now be able to resize the lv using “smit jfs2” or the “extendlv” command.