Date: Mon, 28 May 2001 18:08:53 +0000 (GMT) From: "E.B. Dreger" <eddy+public+spam@noc.everquick.net> To: hackers@FreeBSD.ORG Subject: Re: brainstorm: "intermediate" disk caching Message-ID: <Pine.LNX.4.20.0105281800050.6337-100000@www.everquick.net> In-Reply-To: <3B128FB4.70AE7C69@i-clue.de>
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> Date: Mon, 28 May 2001 19:49:40 +0200 > From: Christoph Sold <so@server.i-clue.de> > >> My gut feel is that this would be more trouble than it's worth, would >> not net any overall performance*reliability (expressed as a >> product) gain, and that one might actually realize a p*r decrease. > > IMHO it would speed up your DB significantly to have it a) run on a RAID > 10 array and b) have it run on the raw disk. Two layers of lag reduced > (well, for reads it is possibly only one layer). RAID 1+0 is what I use... but I was thinking of scalibility. In a five- drive array (using one as a hot spare), RAID 1+0 has 67% the capacity of RAID 5. More expensive per megabyte, but handles more db ops. However, the numbers become less favorable with bigger RAID 1+0 arrays. Also, intermediate caching *does not* inherently defeat the purpose of RAID. IO could be cached to a RAID 1 volume, then transferred to the RAID 5 volume... my question was if it was worth the hassle. Of course, with 36 GB drives readily available, maybe I shouldn't worry until I have a database larger than 72 GB. ;-) Eddy --------------------------------------------------------------------------- Brotsman & Dreger, Inc. EverQuick Internet Division Phone: (316) 794-8922 --------------------------------------------------------------------------- Date: Mon, 21 May 2001 11:23:58 +0000 (GMT) From: A Trap <blacklist@brics.com> To: blacklist@brics.com Subject: Please ignore this portion of my mail signature. These last few lines are a trap for address-harvesting spambots. Do NOT send mail to <blacklist@brics.com>, or you are likely to be blocked. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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