Date: Thu, 15 Aug 2013 11:37:02 -0700 From: aurfalien <aurfalien@gmail.com> To: Charles Swiger <cswiger@mac.com> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: copying milllions of small files and millions of dirs Message-ID: <6483A298-6216-4306-913C-B3E0F4A3BC8D@gmail.com> In-Reply-To: <CC3CFFD3-6742-447B-AA5D-2A4F6C483883@mac.com> References: <7E7AEB5A-7102-424E-8B1E-A33E0A2C8B2C@gmail.com> <CC3CFFD3-6742-447B-AA5D-2A4F6C483883@mac.com>
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On Aug 15, 2013, at 11:26 AM, Charles Swiger wrote: > On Aug 15, 2013, at 11:13 AM, aurfalien <aurfalien@gmail.com> wrote: >> Is there a faster way to copy files over NFS? >=20 > Probably. Ok, thanks for the specifics. >> Currently breaking up a simple rsync over 7 or so scripts which = copies 22 dirs having ~500,000 dirs or files each. >=20 > There's a maximum useful concurrency which depends on how many disk = spindles and what flavor of RAID is in use; exceeding it will result in = thrashing the disks and heavily reducing throughput due to competing I/O = requests. Try measuring aggregate performance when running fewer rsyncs = at once and see whether it improves. Its 35 disks broken into 7 striped RaidZ groups with an SLC based ZIL = and no atime, the server it self has 128GB ECC RAM. I didn't have time = to tune or really learn ZFS but at this point its only backing up the = data for emergency purposes. > Of course, putting half a million files into a single directory level = is also a bad idea, even with dirhash support. You'd do better to break = them up into subdirs containing fewer than ~10K files apiece. I can't, thats our job structure obviously developed by scrip kiddies = and not systems ppl, but I digress. >> Obviously reading all the meta data is a PITA. >=20 > Yes. >=20 >> Doin 10Gb/jumbos but in this case it don't make much of a hoot of a = diff. >=20 > Yeah, probably not-- you're almost certainly I/O bound, not network = bound. Actually it was network bound via 1 rsync process which is why I broke = up 154 dirs into 7 batches of 22 each. I'll have to acquaint myself with ZFS centric tools to help me determine = whats going on. But=20
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