Date: Thu, 17 Dec 1998 22:15:28 -0500 From: Dan Swartzendruber <dswartz@druber.com> To: Greg Lehey <grog@lemis.com> Cc: Matthew Patton <patton@sysnet.net>, freebsd-isp@FreeBSD.ORG Subject: Re: RAID solutions? Message-ID: <3.0.5.32.19981217221528.009cb980@mail.kersur.net> In-Reply-To: <19981218134159.S486@freebie.lemis.com> References: <3.0.5.32.19981217220842.009d5cf0@mail.kersur.net> <3.0.5.32.19981217220152.009c6100@mail.kersur.net> <l03110705b29e428c72d1@[192.168.1.10]> <3.0.5.32.19981215231329.00966ae0@mail.kersur.net> <l03110705b29e428c72d1@[192.168.1.10]> <19981218131434.M486@freebie.lemis.com> <3.0.5.32.19981217220152.009c6100@mail.kersur.net> <19981218133502.Q486@freebie.lemis.com> <3.0.5.32.19981217220842.009d5cf0@mail.kersur.net>
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At 01:41 PM 12/18/98 +1030, Greg Lehey wrote: >On Thursday, 17 December 1998 at 22:08:42 -0500, Dan Swartzendruber wrote: >> At 01:35 PM 12/18/98 +1030, Greg Lehey wrote: >>> On Thursday, 17 December 1998 at 22:01:52 -0500, Dan Swartzendruber wrote: >>>> >>>> Greg, are there any performance ramifications with RAID5? When not in >>>> degraded mode, of course... >>> >>> Yes, big ones. Every write in normal mode requires at least one >>> additional I/O to the parity block. >> >> That's what I wondered about. Probably not worth it for a news spool... > >It depends. Matthew was recommending RAID-1 (mirroring). That >requires significantly more disk. If you are concerned about the >integrity of your news spool, you have the choice between RAID-5 and >RAID-1. Mirroring sucks for this, no? Twice the space, and you still have to do an extra write, don't you? I know it can be faster when reading (I work at a company that does fault-tolerant TP systems, so we have to deal with these issues...) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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