From: n. federov (BldrxJ@netscape.net)
Date: Sat Jan 24 2004 - 01:18:21 EST
Thanks to Chris Bryant, Martin Roende, Adrian Hicks and Alan Rollow...
Mirroring swap has the advantage of availability should one of the swap disks fail (although this could be achieved with secondary rather than mirrored swap). The consensus seems to be that there is a performance hit, however this can be mitigated by mirroring across busses. I haven't noticed any degradation at all, and neither did a couple of other responders. Most likely, as Alan pointed out, how noticable or important that performance issue is would be configuration dependent. For a very swap intensive (meaning probably memory-bound) machine, it could possibly be an issue. My decision is to mirror the swap for availability and provide enough memory to keep paging to a minimum.
Thanks everyone!
nikolai
BldrxJ@netscape.net (n. federov) wrote:
>Dear Tru64 managers,
>
>I am running tru64 5.1b on an ES45, pk3.
>
>I'm wondering if there would be a performance hit from mirroring my swap volume in LSM. Intuitively, mirrored swap doesn't sound like it would be very performance-friendly, however this depends I think on how the LSM driver handles I/O.
>
>Could someone explain to me whether mirroring my swap space will cause a performance degradation, and if so, for what reason? If not, why not?
>
>Thanks very much in advance...
>--
>nikolai
>
>
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