From: Green, Simon (Simon.Green@EU.ALTRIA.COM)
Date: Tue Apr 08 2003 - 11:56:53 EDT
I would advise against this, unless you have no choice.
I set up a BigVG a few years ago and it was a major pita!
The big problem was that all LVM commands seemed to take forever.
It's bad enough when you've got time for a cigarette between
issuing lsvg and getting any output; it's worse when a VG recovery
takes two hours instead of 20 minutes. (Trying to get it to work
correctly at our Disaster Recovery tests was a nightmare.)
If you have to do it, treat it as a temporary solution: try to
convince management to split the VG later on; it'll be much less
painful in the long run.
Simon Green
Altria ITSC Europe s.a.r.l.
AIX-L Archive at http://marc.theaimsgroup.com/?l=aix-l&r=1&w=2
AIX FAQ at http://www.faqs.org/faqs/aix-faq/
N.B. Unsolicited email from vendors will not be appreciated.
> -----Original Message-----
> From: pSeries AIX Geek [mailto:aixgeek@YAHOO.COM]
> Sent: 08 April 2003 16:30
> To: aix-l@Princeton.EDU
> Subject: Big VGs
>
>
> I inherited a system that has a volume group with
> thirty two 8GB Shark LUNs. Obviously, we're maxed
> out. The current plan is to move to a "big" VG.
> There's some 150 free PPS on one disk, so I do have
> the option of using lmigratepp to move the first {x}
> partitions from each disk to the free section in the
> VG.
>
> [Rebuilding a new VG or using another VG is also an
> option, but for various reasons, the DBAs are leaning
> toward this one.]
>
> My questions:
>
> 1. AIX 4.3.3 ML 10. Any known problems with big VGs?
> I couldn't see any APARs.
>
> 2. Exactly how many free PPs do I need at the start
> of each disk?
>
> Other than that, I assume that there aren't any issues
> with just shutting everything down and running "chvg
> -B VGname" (after running a database backup, of
> course).
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