Need a little help with AIX 4.3.3 and VG limitations


I have a 7026-6F1 server with 12x18GB internal SSA disks and an external D40 with 16x18GB disks.
This is an Oracle Database server that reports High IO rates some times on the 2 hdisks I have configured as RAID10 for datafiles.
I'm running out of space so I am planning on growing that storage by utilizing another D40 I have with 16-36GB disks.
I'm just trying to recall my limitations with respect to PP size and # of physical disks etc.

I'd like to just add this extra space to my existing 'non-rootvg' but if I check that VG I see:
VOLUME GROUP: myvg VG IDENTIFIER: 000203cfb9985aca
VG STATE: active PP SIZE: 128 megabyte(s)
VG PERMISSION: read/write TOTAL PPs: 2166 (277248 megabytes)
MAX LVs: 256 FREE PPs: 168 (21504 megabytes)
LVs: 32 USED PPs: 1998 (255744 megabytes)
OPEN LVs: 32 QUORUM: 5
TOTAL PVs: 8 VG DESCRIPTORS: 8
STALE PVs: 0 STALE PPs: 0
ACTIVE PVs: 8 AUTO ON: yes
MAX PPs per PV: 1016 MAX PVs: 32

So I see MAX PV's=32 and I'm already at 12+16=28.

If I recall there was some discussion previously about using the chvg with the -B option as in:
"-B Changes the volume group to big vg format. This can accommodate up to 128
physical volumes and 512 logical volumes."
I believe there were some mixed reviews here.

Otherwise depending on how my disk is configured (RAID types) I might be able to migrate some data
via migratepv if I could add some 36GB disks and make a few smaller RAID10 hdisks to stage to?
I'm trying to do this without any downtime or going through a big backup/restore process if possible.

Sorry for the general ramble but if something obvious jumps out at someone let me hear it.

TIA, Mark



<html><body><font face = "arial" size = "1">
DISCLAIMER: The information transmitted is intended only
for the addressee and may contain confidential,
proprietary and/or privileged material. Any
unauthorized review, distribution or other use
of or the taking of any action in reliance upon
this information is prohibited. If you received
this in error, please contact the sender and
delete or destroy this message and any copies.
</font><body></html>

Relevant Pages

  • Re: hdisks missing
    ... So some disks are used by one node, ... After cfgmgr the hdisks are still ... What sort of SSA drawer is it? ... deliberate changes to the SSA loop it's possible that the cables were ...
    (AIX-L)
  • Re: hdisks missing
    ... Hdisks will not be configured if they are in use by another machine. ... So some disks are used by one node, ... What sort of SSA drawer is it? ... Only when both nodes' SSA config is OK should you start ...
    (AIX-L)
  • Re: Need a little help with AIX 4.3.3 and VG limitations
    ... I'd like to add space to them by moving from the 18GB disks to the 36GB disks but I can't ... add them all based on the number of drives I have now and the fact I'm trying to add ... you can use migratepv or mklvcopy to increase the number of spindles that the LVs in question reside upon. ... This is an Oracle Database server that reports High IO rates some times on the 2 hdisks I have configured as RAID10 for datafiles. ...
    (AIX-L)
  • Re: hdisks missing
    ... >Hdisks will not be configured if they are in use by another machine. ... So some disks are used by one node, ... What sort of SSA drawer is it? ... Only when both nodes' SSA config is OK should you start ...
    (AIX-L)
  • Re: large RAID volume partition strategy
    ... RAID10. ... RAID10 and RAID0+1 are very different beasts. ... In this case, you divide the disks into two equal sets, ... create a RAID0 stripe over each set and then a RAID1 mirror over the ...
    (freebsd-stable)