Date: Sat, 12 Jul 2003 17:13:29 +0930 From: Greg 'groggy' Lehey <grog@FreeBSD.org> To: Mike Maltese <mike@pcmedx.com> Cc: freebsd-questions@freebsd.org Subject: Re: vinum and hot-swapping Message-ID: <20030712074329.GO24420@wantadilla.lemis.com> In-Reply-To: <001b01c34835$6cc93ca0$f9f0a8c0@pcmedx.com> References: <000e01c34830$6e543bb0$f9f0a8c0@pcmedx.com> <20030712045247.GL24420@wantadilla.lemis.com> <001b01c34835$6cc93ca0$f9f0a8c0@pcmedx.com>
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--McmgqJn15zuLm7T+ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Friday, 11 July 2003 at 22:21:19 -0700, Mike Maltese wrote: >> Depends on what you mean. Vinum isn't a hardware device driver, so it >> doesn't need to understand hot swapping. If you hot swap a drive, >> Vinum handles the resulting events correctly. > > So if I have a drive fail, say in a RAID 5 configuration, I don't have to > detach it at all? Just swap them out and vinum will automatically begin > rebuilding the array? Well, not quite. See http://www.vinumvm.org/vinum/replacing-drive.html for the real story. > Also, what would you say the minimum processor requirement would be? > I know RAID 5 is quite taxing compared to mirroring or plain > striping. I developed Vinum on a 66 MHz i486. I didn't notice any significant processor load. Remember that modern CPUs are an order of magnitude faster than most RAID controllers. 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. 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 --McmgqJn15zuLm7T+ Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.0 (FreeBSD) iD8DBQE/D7whIubykFB6QiMRAmd7AKCGExPNxUeyfl+cUQ45s5MvzOHmewCgoheB SLRcQ9Pj1tk0qDYu5IP7w1A= =N4Up -----END PGP SIGNATURE----- --McmgqJn15zuLm7T+--
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