Date: Fri, 3 Apr 1998 12:42:33 +0100 From: nik@iii.co.uk To: Karl Pielorz <kpielorz@tdx.co.uk> Cc: questions@FreeBSD.ORG Subject: Re: Interleaved swapping... Message-ID: <19980403124233.05061@iii.co.uk> In-Reply-To: <3524C839.C3B5BA77@tdx.co.uk>; from Karl Pielorz on Fri, Apr 03, 1998 at 12:30:01PM %2B0100 References: <3524C839.C3B5BA77@tdx.co.uk>
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On Fri, Apr 03, 1998 at 12:30:01PM +0100, Karl Pielorz wrote:
> If I have multiple swap files on my system (running 2.2.6-R) - are they
> interleaved by default? - or does the system just swap to device 'a', until
> it's out of space - then start swapping to device 'b'?
It uses both. Anecdotal evidence suggests that if you plan on having
128 MB of swap (for example) and you have two disks, it's better to have
2 64MB swap partitions, since the system spreads the load over the disks.
I say "anecdotal" because I haven't seen any hard figures showing how
much of an improvement this is. Doubtless they exist, but I don't know
where.
(I've faked up this display because I only have one swap partition, but
I've used it with both)
# swapinfo
Device 512-blocks Used Avail Capacity Type
/dev/wd0s1b 262144 134752 127264 51% Interleaved
/dev/wd1s1b 262144 134752 127264 51% Interleaved
N
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