Date: Wed, 17 Dec 1997 21:01:07 +0100 From: "Jesus A. Mora Marin" <amora@zoom.es> To: "John S. Dyson" <toor@dyson.iquest.net> Cc: questions@FreeBSD.ORG Subject: Re: MFS related questions Message-ID: <199712172101.WAA10767@silvester.zoom.es> In-Reply-To: <199712170259.VAA01348@dyson.iquest.net> References: <199712162137.WAA09873@silvester.zoom.es> from "Jesus A. Mora Marin" at "Dec 16, 97 09:38:08 pm"
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Thank you, John. > MFS performs very well in FreeBSD. Paging only happens when the > files on the MFS filesystem get too big. There is a signficant > design flaw that the buffer cache is synced into the MFS server, > but that really doesn't have a severe performance hit. Yes, I think this point was remarked in McKusick et al's book (pp 305 & 306). It seems this flaw was a result of the virtual memory system implementation when MFS was originally designed. Well, I have thought further about this subject and guess that the MFS_ROOT specifies the size of the mfs root directory when mounted, but I assume this value can be overridden by actual parameters in the mfs_mount command. One last question: how many mfs filesystems can be mounted at any time? Jesus ------ Jesus A. Mora Marin, MD. (aka EA7HAC, ex-EC7DVE)
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