Date: Wed, 12 Nov 2008 20:22:29 -0600 From: Kevin Day <toasty@dragondata.com> To: freebsd-fs@freebsd.org Subject: UFS Snapshot lock time Message-ID: <6EEFB17C-10DF-4CCD-AB07-83B4B75D033F@dragondata.com>
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Is there any documentation out there that explains how to optimize UFS snapshotting? Specifically, we've got a rather big filesystem that I'd like to do hourly snapshots of. I don't mind how long the snapshot itself takes, but the amount of time the filesystem is locked is a problem. We're "dead" for about 12 minutes per snapshotting. Is there anything to tweak to speed it up any? (memory v.s. time exchange somewhere?) Is the length of time it takes a function of the number of inodes, directories, or...? Relevant info: Filesystem 1K-blocks Used Avail Capacity iused ifree %iused Mounted on /dev/da0s1a 739339824 73453348 606739292 11% 1717543 93856471 2% / which is a 6 drive RAID-0 array. CPU: Dual-Core AMD Opteron(tm) Processor 2218 (2593.52-MHz K8-class CPU) usable memory = 17166548992 (16371 MB) FreeBSD/SMP: Multiprocessor System Detected: 4 CPUs In theory, this should be a rather fast box, but it is a rather large filesystem. -- Kevin
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