Anton B. Rang wrote:
I time mkfile'ing a 1 gb file on ufs and copying it [...] then did
the same thing on each zfs partition. Then I took snapshots,
copied files, more snapshots, keeping timings all the way. [ ... ]
Is this a sufficient, valid test?
If your applications do that -- manipulate large files, primarily
copying them -- then it may be.
If your applications have other access patterns, probably not. If
you're concerned about whether you should put ZFS into production,
then you should put it onto your test system and run your real
applications on it for a while to qualify it (just as you should for
any other file system or hardware).
I couldn't agree more.
That said, I would be extremely surprised if the presence of snapshots
or clones had any impact whatsoever on the performance of accessing a
given filesystem. I've never seen anything like that.
--matt
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