yet another zfs diff question

Discussion:

Ian Collins via illumos-zfs

2014-06-16 22:23:03 UTC

Another observation that may have a simple explanation...

While running daily a diff on a fairly large filesystem, I've noticed
the diff completes faster during the week when there are many changes
than over the weekend when there are few. For example Friday and today:

Thursday-00:00 -> Friday-00:00 50 minutes, 51,000 diffs.
Monday-00:00 -> Tuesday-00:00 68 minutes, 32,000 diffs.

Over the weekend:

Saturday-00:00 -> Sunday-00:00 591 minutes, 221 diffs.
Sunday-00:00 -> Monday-00:00 551 minutes, 54 diffs.

I've seen the same pattern for a couple of weeks now.

Is there an obvious reason for this?

--
Ian.

Robert Milkowski via illumos-zfs

2014-06-17 10:02:28 UTC

Permalink

Do you perhaps run zpool scrub over weekend?

-----Original Message-----
Sent: 16 June 2014 23:23
Subject: [zfs] yet another zfs diff question
Another observation that may have a simple explanation...
While running daily a diff on a fairly large filesystem, I've noticed
the diff completes faster during the week when there are many changes
Thursday-00:00 -> Friday-00:00 50 minutes, 51,000 diffs.
Monday-00:00 -> Tuesday-00:00 68 minutes, 32,000 diffs.
Saturday-00:00 -> Sunday-00:00 591 minutes, 221 diffs.
Sunday-00:00 -> Monday-00:00 551 minutes, 54 diffs.
I've seen the same pattern for a couple of weeks now.
Is there an obvious reason for this?
--
Ian.
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Ian Collins via illumos-zfs

2014-06-17 20:35:49 UTC

Permalink

Post by Robert Milkowski via illumos-zfs

Do you perhaps run zpool scrub over weekend?

No, there should be very little activity on the pool.

--
Ian.