About a month ago, I upgraded my workstation to Nevada build 49. When
I ran "zpool status" on my existing zfs pool (a couple mirrored
partitions, one from each of the system's two disks), I discovered that
the existing on-disk format was at version 1 and that I could upgrade
to version 3. I chose to defer doing so, until I was sure that I would
no longer boot back into the partition holding my previous root (from
build 29).
Last week, I decided it was time to take the plunge and invoked
% zpool upgrade zfs
The upgrade completed successfully, with no error messages.
But since that upgrade I've been getting unremitting bursts of disk
i/o. When there's no activity on the system, they occur at a frequency
of 1/minute. (With activity, the frequency is higher. From listening
to my disks, there seems to be considerably more i/o traffic than
before the upgrade.) Here's iostat info from when the system is
essentially idle:
% iostat 20
tty sd0 sd1 sd3 nfs1 cpu
tin tout kps tps serv kps tps serv kps tps serv kps tps serv us sy wt id
0 3 273 29 120 280 29 93 0 0 0 0 0 9 26 6 0 69
0 12 11 5 20 11 5 17 0 0 0 0 0 0 2 1 0 97
0 4 0 0 0 1 1 20 0 0 0 0 0 0 2 1 0 97
0 4 2 0 3 1 0 6 0 0 0 0 0 0 2 1 0 97
0 4 11 5 20 11 5 18 0 0 0 0 0 0 1 1 0 98
0 4 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 98
0 4 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 98
0 4 11 5 18 11 5 17 0 0 0 0 0 0 1 1 0 98
0 4 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 98
0 4 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 98
0 4 11 5 19 11 5 17 0 0 0 0 0 0 1 1 0 98
^C%
This periodic activity did not occur before I upgraded my zfs pool, and
I can't think of any other change that might account for it. The pool
is completely healthy:
% zpool status zfs
pool: zfs
state: ONLINE
scrub: scrub completed with 0 errors on Fri Jan 12 15:34:05 2007
config:
NAME STATE READ WRITE CKSUM
zfs ONLINE 0 0 0
mirror ONLINE 0 0 0
c0t1d0s6 ONLINE 0 0 0
c0t0d0s6 ONLINE 0 0 0
errors: No known data errors
%
Have there been changes to the zfs implementation between builds 29 and
49 that a pool upgrade would trigger to cause periodic disk activity?
The noise from my disks is slowly driving me crazy (it's like Chinese
water torture...).
-- Glenn Skinner
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