Date: Wed, 24 Nov 2004 09:02:11 +1030 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Ivan Voras <ivoras@fer.hr> Cc: current@freebsd.org Subject: Re: gvinum panic? Message-ID: <20041123223210.GL21905@wantadilla.lemis.com> In-Reply-To: <41A33907.5020703@fer.hr> References: <41A2488F.8030802@fer.hr> <20041122215228.J568@korben.in.tern> <41A33907.5020703@fer.hr>
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--Mit9XoPEfICDqq/V Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Tuesday, 23 November 2004 at 14:20:07 +0100, Ivan Voras wrote: > Lukas Ertl wrote: >> On Mon, 22 Nov 2004, Ivan Voras wrote: >> >>> I'm consistently getting a system panic, trap #12 in process g_event >>> when I try: >> >> Are you sure that kernel (modules) and userland are in sync? > > Thanks, it looks like they've been unsynced for a while :( > It's ok now. > > But, the performance is pretty bad (same with regular vinum). I tried > setting up graid3 class with same parameters, and got these results: > > linear read (1024 MB file, blocks of 32768) ................. 38.5 MB/s > linear write (1024 MB file, blocks of 32768) ................ 16.8 MB/s > random read (1024 MB file, blocks of 32768) ................. 41.9 MB/s > random write (1024 MB file, blocks of 32768) ................ 3.4 MB/s > > > with raid5, gvinum or vinum, I get these: > > linear read (1024 MB file, blocks of 32768) ................. 27.8 MB/s > linear write (1024 MB file, blocks of 32768) ................ 4.2 MB/s > random read (1024 MB file, blocks of 32768) ................. 44.2 MB/s > random write (1024 MB file, blocks of 32768) ................ 1.9 MB/s > > (random reads are really random, no clustering or anything). > My setup is 2 IDE channels with three discs, so one is a slave (and > contains the parity disc in case of raid3). Do these numbers make > sense? Not without clarifying what you're doing. If you're only doing one request at a time, there's no way that RAID can help you. I find it highly unlikely that all three RAID alternatives generate the same numbers. Greg -- See complete headers for address and phone numbers. --Mit9XoPEfICDqq/V Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (FreeBSD) iD8DBQFBo7pqIubykFB6QiMRAgpJAKCfsG6SCRzYCyfT3pTNG56rC0hlzwCcD0Jj 0YLJz+Kw4ZiJA/gxvq4SjIE= =+Q9O -----END PGP SIGNATURE----- --Mit9XoPEfICDqq/V--
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