Date: Sun, 13 Jul 2003 13:26:07 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Andrea Venturoli <ml.ventu@flashnet.it> Cc: FreeBSD Questions <questions@FreeBSD.org> Subject: Re: vinum and hot-swapping Message-ID: <20030713035607.GF55186@wantadilla.lemis.com> In-Reply-To: <200307130245.h6D2j8HA000556@soth.ventu> References: <200307130245.h6D2j8HA000556@soth.ventu>
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--xaMk4Io5JJdpkLEb Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Sunday, 13 July 2003 at 4:45:08 -0500, Andrea Venturoli wrote: > ** Reply to note from "Greg 'groggy' Lehey" <grog@freebsd.org> Sat, 12 Jul 2003 17:13:29 +0930 > > >> The real performance penalty for RAID-5 is simply that writes require >> so much I/O. Expect 25% of the write performance of RAID-0. > > Ok, I must ask this: > Shouldn't SCSI system allow paralell writes on different disks? Yes, it does. > If so, why so much penalty? Take a look at the man page, section "Performance considerations". It's too long to repeat here. 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 --xaMk4Io5JJdpkLEb Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.0 (FreeBSD) iD8DBQE/ENhXIubykFB6QiMRAsMTAJ90rLANWjyE8xK7nlyciuKKwwb8MQCfaHAr BzDnggM1EJVbq2VPqoaNBGs= =jV2C -----END PGP SIGNATURE----- --xaMk4Io5JJdpkLEb--
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