[linux-lvm] Swap/DB devices
Heinz Mauelshagen
mauelsha at ez-darmstadt.telekom.de
Thu Apr 15 16:24:10 UTC 1999
>
> I'm in the process of re-jigging all the file systems to sit in volume
> groups.
>
> Two questions :-
>
> a) Can I setup swap to run from a volume group is it a good idea?
Yes.
It's as good as partition based swap (very low LVM driver overhead).
Please take i/o amounts into consideration and avoid to allocate swap LVs
and other i/o intensive LVs on the same PVs.
>
> b) I have database devices running in cooked file systems for Oracle,
> Sybase and Informix.
>
> Vendor recommendations for sybase and Informix are normally raw, here we
> carve our database devices from HP volume groups is this a good idea for
> linux?
There is a raw device patch available by Stephen Tweedie.
IIRC it will make it into the 2.3 kernel (what do you say Stephen?).
LVM has to be enhanced a little bit to support that patch.
>
> Anybody done this?
>
Yes, i did successfull tests with a lot of swap LVs.
Anybody out there with (big) database installations on LVM?
BTW: you can have performance boosts by setting up striped LVs
if your hardware setup is o.k. (enough i/o bandwith on scsi busses,
several busses ...)
Regards,
Heinz
--
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Systemmanagement C/S Deutsche Telekom AG
Entwicklungszentrum Darmstadt
Heinz Mauelshagen Otto-Roehm-Strasse 71c
Senior Systems Engineer Postfach 10 05 41
64205 Darmstadt
mge at ez-darmstadt.telekom.de Germany
+49 6151 886-425
FAX-386
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