Date: Fri, 17 Aug 2007 18:23:29 -0400 From: Kris Kennaway <kris@obsecurity.org> To: Mark Messier <mark@messier.com> Cc: "Michael K. Smith - Adhost" <mksmith@adhost.com>, FreeBSD Mailing List <freebsd-questions@freebsd.org> Subject: Re: performance hints (6.2) Message-ID: <20070817222329.GA32638@rot26.obsecurity.org> In-Reply-To: <289E327A-ED2B-4099-AAFF-8CF0FFE7C572@messier.com> References: <4B90A9A7-D8D6-49C5-B097-00094486EF4A@messier.com> <17838240D9A5544AAA5FF95F8D52031602504E94@ad-exh01.adhost.lan> <289E327A-ED2B-4099-AAFF-8CF0FFE7C572@messier.com>
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--mP3DRpeJDSE+ciuQ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, Aug 17, 2007 at 01:35:48PM -0700, Mark Messier wrote: > >> What does a gstat look like over time? >=20 > Oooh, didn't know about gstat.... it shows disks as being 102% busy =20 > at times :-) gstat's "busy" statistic is entirely meaningless for this context (rather, it has a meaning but it's not what you think it is). Instead you should be looking at the number of transactions/second and the average time/transaction. This tells how long processes are waiting before the disk controller can service the I/O, and you should compare those numbers to your performance requirements or your expectations from the hardware. Your data showed your CPU doing almost no work, so I/O is definitely your problem though. Kris --mP3DRpeJDSE+ciuQ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.4 (FreeBSD) iD8DBQFGxh/hWry0BWjoQKURAjeMAKDI1jjVsibN8f8TYKVQJ1vYNjAvRQCeL7qi am5YvKjIlNev0CQS+LZFIvA= =YiL3 -----END PGP SIGNATURE----- --mP3DRpeJDSE+ciuQ--
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