Hello Peter,
Friday, February 13, 2009, 10:41:54 AM, you wrote:
PT> I'm moving some data off an old machine to something reasonably new.
PT> Normally, the new machine performs better, but I have one case just now
PT> where the new system is terribly slow.
PT> Old machine - V880 (Solaris 8) with SVM raid-5:
PT> # ptime du -kds foo
PT> 15043722 foo
PT> real 6.955
PT> user 0.964
PT> sys 5.492
PT> And now the new machine - T5140 (latest Solaris 10) with ZFS striped
PT> atop a bunch of 2530 arrays:
PT> # ptime du -kds foo
PT> 15343120 foo
PT> real 2:55.210
PT> user 2.559
PT> sys 2:05.788
PT> It's not just du; a find on that directory is similarly bad.
Maybe you have some extra tuning on the old server like increased
DNLC? I would check how many IOs (if any) you are doing during find
(not a 1st run of course)
On the other hand your find/du will depend mostly on a single thread
performance and as you can see above you spending relative high
percentage on CPU and your T2+ will most probably deliver less single
thread performance than your V880.
--
Best regards,
Robert Milkowski
http://milek.blogspot.com
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