Date: Thu, 10 Aug 2000 11:48:56 -0500 From: Dan Nelson <dnelson@emsphone.com> To: Francisco Reyes <fran@reyes.somos.net> Cc: FreeBSD questions <questions@FreeBSD.ORG> Subject: Re: Suggested minimun memory for light use 100Gb filesystem? Message-ID: <20000810114856.B3892@dan.emsphone.com> In-Reply-To: <200008101551.LAA08460@sanson.reyes.somos.net>; from "Francisco Reyes" on Thu Aug 10 12:01:11 GMT 2000 References: <20000809104757.A12045@dan.emsphone.com> <200008101551.LAA08460@sanson.reyes.somos.net>
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In the last episode (Aug 10), Francisco Reyes said: > On Wed, 9 Aug 2000 10:47:57 -0500, Dan Nelson wrote: > > 64MB should be fine, 128MB is probably better. I've got a 200gb > > volume used as a staging area for dumping files to DLT, and the > > machine has 128MB of RAM. As long as you're just doing sequential > > I/O, the amount of RAM you have isn't that important. > > Thanks. I am planning on giving it 128MB of ram and see how that > works. How can one tell if the amount of memory is not enough for > caching? Left 3 columns on vmstat? The 'flt' column might be useful, but FreeBSD really doesn't have any VM cache statistics; i.e. how many times a read() request had to read from disk vs RAM. The "vfs.cache" tree in sysctl looks interesting, but I wouldn't know how to interpret it. -- Dan Nelson dnelson@emsphone.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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