Date: Wed, 23 Apr 2003 11:34:10 -0500 From: David Kelly <dkelly@hiwaay.net> To: FreeBSD-Questions@FreeBSD.org Subject: block and fragment sizes with newfs Message-ID: <20030423163410.GA25333@grumpy.dyndns.org>
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Playing with UFS on CF (Compact Flash) cards where I'm concerned about wear and tear, and maximum efficiency. It would seem "newfs -b 4096 -f 512" would result in fine grained control over each and every 512 byte block on my CF card and eliminate writes to multiple blocks when a write to a single block would do. The above creates a lot of "superblock backups", leading me to suspect what I save in fragment size == block size, I lose in overhead to track all these fragments. The default is "-b 16384 -f 2048", which if I understand correctly means the minimum read/write to the filesystem will be 2048 bytes? A middle of the ground compromise is "-b 8192 -f 1024". What's the deal? -- David Kelly N4HHE, dkelly@hiwaay.net ===================================================================== The human mind ordinarily operates at only ten percent of its capacity -- the rest is overhead for the operating system.
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