Date: Thu, 20 Sep 2007 12:45:00 +0200 From: Fluffles <etc@fluffles.net> To: freebsd-fs@FreeBSD.org Subject: Writing contigiously to UFS2? Message-ID: <46F24F2C.40205@fluffles.net>
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Hello list, I've setup a concat of 8 disks for my new NAS, using ataidle to spindown the disks not needed. This allows me to save power and noise/heat by running only the drives that are actually in use. My problem is UFS. UFS2 seems to write to 4 disks, even though all the data written so far can easily fit on just one disk. What's going on here? I looked at newfs parameters, but in the past was unable to make newfs write contigiously. It seems UFS2 always writes to a new cylinder. Is there any way to force UFS to write contigiously? Or at least limit the problem? If i write 400GB to a 4TB volume consisting of 8x 500GB disks, i want all data to be on the first disk. If the data spreads, then more disks will be 'awaken' when i read my data, which defeats the purpose of my power-saving NAS experiment. Any feedback is welcome. Using FreeBSD 6.2-RELEASE i386, used newfs -U -S 2048 <device>. - Veronica
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