Date: Tue, 19 Aug 2003 18:32:07 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Niklas Saers Mailinglistaccount <niklasmls@doriath.saers.com> Cc: freebsd-questions@freebsd.org Subject: Re: Vinum performance Message-ID: <20030819090207.GA20240@wantadilla.lemis.com> In-Reply-To: <20030819095355.C34268@doriath.saers.com> References: <20030819095355.C34268@doriath.saers.com>
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--zAIN9dnKNiFxaW1E Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Tuesday, 19 August 2003 at 9:56:13 +0200, Niklas Saers Mailinglistaccou= nt wrote: > Hi all, > I was wondering if anyone can tell me about their experience of Vinum and > its performance on RAID5 systems? I've built a vinum-raid of 4 160Gb disks > that each do a dd if=3D/dev/zero of=3D/dev/adNd of about 60Mb/sec. Howeve= r, > when I've set up my raid, performance drops to 6Mb/sec, and with only > three disks it drops to 4.5Mb/sec. Is this usual?=20 No. You should expect about =BC the write performance of a single disk under these rather contrived circumstances. > Because with this speed I cannot run the system at all. Have you built this system for writing single sectors to a volume using dd? > Any good way of tuning the system? There are some ideas in the man page and the web site. But in general, RAID-5 isn't designed for heavy write accesses. Greg -- When replying to this message, please copy the original recipients. If you don't, I may ignore the reply or reply to the original recipients. For more information, see http://www.lemis.com/questions.html See complete headers for address and phone numbers --zAIN9dnKNiFxaW1E Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.0 (FreeBSD) iD8DBQE/QeePIubykFB6QiMRAowAAJ9QYbANb5YDElhFK8W31prFTn5t1ACePehf OmMBStLvb54wspmfAAy9xU0= =yY5A -----END PGP SIGNATURE----- --zAIN9dnKNiFxaW1E--
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