AIX extend VG error Post: 303033654

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Operating Systems AIX AIX extend VG error Post 303033654 by Phat on Wednesday 10th of April 2019 03:05:23 AM

04-10-2019

Registered User

Hi Bakunin,
Like you said, we can increase LUNs in size at storage by adding 1 or more disks to the LUN.

Quote:

Most storage systems offer the possibility to increase LUNs in size. If your system does you can use chvg -g to make the VG aware of such an increased LUN instead of adding new LUNs to the VG to accomodate increased storage demands over time

I have 1 concern here, currently, the max PP of PV is limited at 2032 PPs x 128 MB = 260 GB. Because of this limitation, I cannot add the 1 TB PV whose PPs are greater than 2032 PPs.

If we grow the LUN in size example 500GB in total, it will breach the limits of 2032 PPs. Still acceptable from VG side?

Yes. Exactly.

Quote:

Really? To quote yourself:

I copy here again. Note that below info is taken from another machine which has big VG and scalable VG.
Big VG it has 2 parameters: Max PPs per VG and 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 with the scalable VG, we have only Max PPs per VG, the Max PPs per PG disappeared. PP size still remains unchanged like you said (never able to change without recreate)
This disappearance of Max PPs per PG, according to my thinking, remove the limit of max PPs per PV, it means that we can add any PV regardless of its size/PPs while PP size unchanged.

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

--- Post updated at 07:05 AM ---

---- correct some typos ---

Phat

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