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Issue with increasing size of SAN disks on AIX

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HI, I have had an issue last night while trying to extend a filesystsem . chvg -g <vg> command cameback with an error

Code:

0516-1790 chvg: Failed bootinfo -s hdisk9.
        Ensure the physical volume is available and try again.
0516-732 chvg: Unable to change volume group u01vg.

the VG has 1 filesystem

Code:

lslv -l <LV> command
PV                COPIES        IN BAND      DISTRIBUTION
hdisk9            2659:000:000  20%          533:533:532:532:529
hdisk10          2658:000:000  20%          533:533:532:532:528
hdisk36          2658:000:000  20%          533:533:532:532:528
hdisk37          2658:000:000  20%          533:533:532:532:528


I have tried umounting the filesystem and varying off and on the VG but same issue.

its a production DB2 database so i really cant easily get outages like this. Any ideas anyone.

---------- Post updated at 07:30 AM ---------- Previous update was at 07:28 AM ----------

its AIX version 6.1 btw and lsvg <vg> command
Code:

VOLUME GROUP:      u01vg                    VG IDENTIFIER:  00f6917e00004c000000013214f41318
VG STATE:          active                  PP SIZE:        128 megabyte(s)
VG PERMISSION:      read/write              TOTAL PPs:      10652 (1363456 megabytes)
MAX LVs:            256                      FREE PPs:      19 (2432 megabytes)
LVs:                1                        USED PPs:      10633 (1361024 megabytes)
OPEN LVs:          1                        QUORUM:        3 (Enabled)
TOTAL PVs:          4                        VG DESCRIPTORS: 4
STALE PVs:          0                        STALE PPs:      0
ACTIVE PVs:        4                        AUTO ON:        yes
MAX PPs per VG:    32768                    MAX PVs:        1024
LTG size (Dynamic): 1024 kilobyte(s)        AUTO SYNC:      no
HOT SPARE:          no                      BB POLICY:      non-relocatable
MIRROR POOL STRICT: off
PV RESTRICTION:    none                    INFINITE RETRY: no

Moderator's Comments:
edit by bakunin: Please view this code tag video for how to use code tags when posting code and data.

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