I'm moving some data off an old machine to something reasonably new. Normally, the new machine performs better, but I have one case just now where the new system is terribly slow.
Old machine - V880 (Solaris 8) with SVM raid-5: # ptime du -kds foo 15043722 foo real 6.955 user 0.964 sys 5.492 And now the new machine - T5140 (latest Solaris 10) with ZFS striped atop a bunch of 2530 arrays: # ptime du -kds foo 15343120 foo real 2:55.210 user 2.559 sys 2:05.788 It's not just du; a find on that directory is similarly bad. I have other filesystems of similar size and number of files (there are only about 200K files) that perform well, so there must be something about this filesystem that is throwing zfs into a spin. Anybody else seen anything like this? I'm suspicious of ACL handling. So for a quick test I took one directory with approx 5000 files in it and timed du (I'm running all this as root, btw): 1. Just the files, no ACLs. real 0.238 user 0.050 sys 0.187 2. Files with ACLs: real 0.467 user 0.055 sys 0.411 3. Files with ACLs, and an ACL on the directory real 0.610 user 0.058 sys 0.551 I don't know whether that explains all the problem, but it's clear that having ACLs on files and directories has a definite cost. -- -Peter Tribble http://www.petertribble.co.uk/ - http://ptribble.blogspot.com/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
