Re: Rootvg mirroring

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Date:         Thu, 9 Sep 2004 15:05:14 -0500
To: aix-l@Princeton.EDU

Good points. We have taken care of the pp size, but thanks for the
heads up.

For us we like to put little more than the OS on the internal disks, so
140Gb is an overkill.

For D/R purposes the difference between a mksysb on a 140Gb drive and a
34Gb drive is less visible if we use rootvg.exclude. We prefer to
backup our 3rd party software (most anyway) via our backup software and
keep the mksysb's as reasonable as possible.

Make sense or do others make mksysb's from full rootvgs? If so where do
you store them? We kill our minimal images with our NIM master, this
has worked for us.

-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU] On Behalf Of
Green, Simon
Sent: Thursday, September 09, 2004 12:23 PM
To: aix-l@Princeton.EDU
Subject: Re: Rootvg mirroring

LVM will cope quite happily with mirroring across dissimilar disk:
different size, different speed, completely different type of hardware.

One thing worth considering, (in my opinion), is if the system is
critical enough that rootvg (most of it) must be mirrored, what is there
that you can do without? If you put application data on there, for
example, there's little point in having the system up if you don't have
the application!

I would also give some thought to recovery. Once the rootvg is created
it will not be possible to restore the mksysb unless at least one 140GB
disk is available. This may have implications for Disaster Recovery and
other situations.

--
Simon Green
Altria ITSC Europe Ltd
AIX-L Archive at https://new-lists.princeton.edu/listserv/aix-l.html
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> -----Original Message-----
> From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU] On Behalf
> Of Robert Miller
> Sent: 09 September 2004 17:24
> To: aix-l@Princeton.EDU
> Subject: Re: Rootvg mirroring
>
>
> Hmm, can you mirror LV's across different-sized drives now?  I was
> always under the impression that you had to have basically identical
> drives... perhaps that was just a suggestion.
>
> If you can, one thing that might cause an issue is if the drives are
> different speeds - say one is 10k rpm and the other is 15k... I'd
> wonder if there were going to be timing issues there, or if the LVM
> code would
> take care of the speed difference.  That may be a non-issue, but it's
> about the only thing I can think of offhand.
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• Previous message: Bob.Kelley_at_BRINKSINC.COM: "Where's your DBA access level?"
• Maybe in reply to: Page, Jennifer: "Rootvg mirroring"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]