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From: graichen@dirac.physik.fu-berlin.de (Thomas Graichen)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: 2 swap devices: does it make sense?
Date: 16 Jan 1996 12:32:55 GMT
Organization: Freie Universitaet Berlin
Lines: 29
Message-ID: <4dg5tn$9f5@fu-berlin.de>
References: <87u41zetl7.fsf@compi.hobby.nl> <4denac$re@vulture.dmem.strath.ac.uk> <MICHAELV.96Jan16000702@MindBender.HeadCandy.com>
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Michael L. VanLoon (michaelv@MindBender.HeadCandy.com) wrote:
: In article <4denac$re@vulture.dmem.strath.ac.uk> nbc@vulture.dmem.strath.ac.uk (Neil Brendan Clark) writes:
: Peter Mutsaers <plm@compi.hobby.nl> wrote:
: >If I define 2 swap devices, each on a different disk, and I'm doing
: >heavy disk I/O: will both swap devices be used by FreeBSD 2.1 to
: >divide the disk I/O over the two disks?
: Swap devices are interleaved, so the answer is yes. How effective this
: strategy is would (I imagine) depend on your hard disks; for example, I
: am unsure how useful two IDE disks would be since CPU time is used by
: data transfers, but SCSI drives would give a definite improvement. At least,
: that is, if the world is a fair place ;-)
: Three SCSI drives, each with a 32MB swap partition, work just great on
: my system (with a BusLogic bt747 EISA controller), yes...
also two IDE drives (each on its own controller) are also better than one
:-)
t
_______________________________________________________||___________________
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Perfection is reached, not when there is no __|| thomas graichen
longer anything to add, but when there __|| freie universitaet berlin
is no longer anything to take away __|| fachbereich physik
__||
- Antoine de Saint-Exupery - __|| graichen@mail.physik.fu-berlin.de
___________________________||__________________graichen@FreeBSD.org_________