Date: Tue, 25 Mar 2008 10:58:07 +0100 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-performance@freebsd.org Subject: Re: performance tuning on perc6 (LSI) controller Message-ID: <fsai10$c2p$1@ger.gmane.org> In-Reply-To: <47E85C00.4010601@umich.edu> References: <47E85C00.4010601@umich.edu>
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This is an OpenPGP/MIME signed message (RFC 2440 and 3156) --------------enig15D4D51D86A039EFE88DFDD8 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Benjeman J. Meekhof wrote: > My baseline was this - on linux 2.6.20 we're doing 800MB/s write and > greater read with this configuration: 2 raid6 volumes volumes striped > into a raid0 volume using linux software raid, XFS filesystem. Each > raid6 is a volume on one controller using 30 PD. We've spent time > tuning this, more than I have with FreeBSD so far. > time dd if=3D/dev/zero of=3D/test/deletafile bs=3D1M count=3D10240 > 10737418240 bytes transferred in 26.473629 secs (405589209 bytes/sec) > time dd if=3D/test/deletafile of=3D/dev/null bs=3D1M count=3D10240 > 10737418240 bytes transferred in 157.700367 secs (68087465 bytes/sec) I had similar ratio of results when comparing FreeBSD+UFS to most high-performance Linux file systems (XFS is really great!), so I'd guess it's about as fast as you can get with this combination. > Any other suggestions to get best throughput? There is also HW RAID > stripe size to adjust larger or smaller. ZFS is also on the list for > testing. Should I perhaps be running -CURRENT or -STABLE to be get bes= t > results with ZFS? ZFS will be up to 50% faster on tests such as yours, so you should definitely try it. Unfortunately it's not stable and you probably don't want to use it in production. AFAIK there are no significant differences between ZFS in -current and -stable. --------------enig15D4D51D86A039EFE88DFDD8 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFH6My1ldnAQVacBcgRAqn2AJwISFhr2Pp6AnjW+UEuqJJ7e6TI9QCg8Yzn 4BhFANWhF+5RMgVTQ17zR94= =SVSi -----END PGP SIGNATURE----- --------------enig15D4D51D86A039EFE88DFDD8--
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