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Full Discussion: AIX extend VG error
Operating Systems AIX AIX extend VG error Post 303033636 by Phat on Tuesday 9th of April 2019 12:32:01 PM
Old 04-09-2019
Hi Bakunin,

Thank for reply and sorry for late response.

I still not understand well your point here. Yes the disks are LUN. What do you mean when saying to recreate at most 3-4 disks? I guess you mean to create a LUN which contains 3-4 disk like this. Then increase will be done at storage and reflect the change of LUN growth by chvg -g?
Quote:
Second, you have 29 disks in this VG. Most probably many of these disks are very small compared to the size of the VG. I suppose most of these disks are LUNs anyway therefore it makes sense to recreate at most 3-4 of these disks with the same total size and put the VG on it there.
This
Quote:
Short answer: you can't so backup, recreate and restore. You should do that anyway as i will explain further on:
and this:
Quote:
For this to work you want to do away with the 1019-PP-per-disk maximum and hence it makes sense to recreate the new VG as a scalable VG where a PV can have a (practically) unlimited number of PPs. The slight penalty when managing scalable VGs in comparison to classical VGs is negligible.
I understand fro your point that we cannot convert that VG (it's big VG) to scalable to avoid "backup, recreate, restore".

But please see the things here:
on another server ( for illustration my thinking) below is the big VG, I can see we have the parameter "Max PPs per PV"
Code:
[root@abc] / > lsvg vg_abc
VOLUME GROUP:       vg_abc                     VG IDENTIFIER:  00c1cc1400004c0000000128174b7c57
VG STATE:           active                   PP SIZE:        64 megabyte(s)
VG PERMISSION:      read/write               TOTAL PPs:      19188 (1228032 megabytes)
MAX LVs:            512                      FREE PPs:       3826 (244864 megabytes)
LVs:                10                       USED PPs:       15362 (983168 megabytes)
OPEN LVs:           7                        QUORUM:         7 (Enabled)
TOTAL PVs:          12                       VG DESCRIPTORS: 12
STALE PVs:          0                        STALE PPs:      0
ACTIVE PVs:         12                       AUTO ON:        yes
MAX PPs per VG:     130048
MAX PPs per PV:     2032                     MAX PVs:        64
LTG size (Dynamic): 256 kilobyte(s)          AUTO SYNC:      no
HOT SPARE:          no                       BB POLICY:      relocatable
PV RESTRICTION:     none                     INFINITE RETRY: no
DISK BLOCK SIZE:    512                      CRITICAL VG:    no

But on the scalable VG, the parameter "Max PPs per PV" seems disappeared
Code:
[root@abc] / > lsvg vg_pa3
VOLUME GROUP:       vg_pa3                    VG IDENTIFIER:  00fa6d1200004c0000000169ec4b083d
VG STATE:           active                   PP SIZE:        128 megabyte(s)
VG PERMISSION:      read/write               TOTAL PPs:      1599 (204672 megabytes)
MAX LVs:            256                      FREE PPs:       1599 (204672 megabytes)
LVs:                0                        USED PPs:       0 (0 megabytes)
OPEN LVs:           0                        QUORUM:         2 (Enabled)
TOTAL PVs:          1                        VG DESCRIPTORS: 2
STALE PVs:          0                        STALE PPs:      0
ACTIVE PVs:         1                        AUTO ON:        yes
MAX PPs per VG:     32768                    MAX PVs:        1024
LTG size (Dynamic): 256 kilobyte(s)          AUTO SYNC:      no
HOT SPARE:          no                       BB POLICY:      relocatable
MIRROR POOL STRICT: off
PV RESTRICTION:     none                     INFINITE RETRY: no
DISK BLOCK SIZE:    512                      CRITICAL VG:    no

--> based on this I think if we convert the big VG to scalable VG, we can override that settings, in another word, we can add more disks with any size (without limited by 2032 or 3048 PPs)

How about your idea with that?
 

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