Re: Mirror rootvg questions

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Date:         Fri, 11 Apr 2003 06:29:50 -0500
From: John Jolet <john.jolet@FXFN.COM>
To: aix-l@Princeton.EDU

ah, I was confused. I was thinking of the dump device mirroring. my
apologies!

-----Original Message-----
From: Green, Simon [mailto:Simon.Green@EU.ALTRIA.COM]
Sent: Friday, April 11, 2003 5:37 AM
To: aix-l@Princeton.EDU
Subject: Re: Mirror rootvg questions

He most definitely SHOULD mirror hd6 and any other swap spaces - whether
they're in the rootvg or not!

If a disk with an unmirrored paging space fails, the system will crash as
soon as it tries to access it. Why bother mirroring if you're going to
leave yourself open to that? You wouldn't even (necessarily) be able to
re-boot afterwards: the system specifically requires hd6 to be available in
order to start.

The only LVs which should not be mirrored are dedicated dump LVs, if they're
present. The dump code will only write to one copy, so there's no
particular advantage in mirroring. A good approach is to have two similar
dump LVs, one on each disk, set up as primary and secondary dump devices.
That way there should always be one available for a system dump.

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: John Jolet [mailto:john.jolet@FXFN.COM]
> Sent: 10 April 2003 22:10
> To: aix-l@Princeton.EDU
> Subject: Re: Mirror rootvg questions

<SNIP>

> I would remove one of the copies of hd6, though, you don't
> want to mirror
> your swap. i'd add a second swap, the same size as the first
> on the other
> spindle.

• Previous message: Green, Simon: "Re: Mirror rootvg questions"
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