on 26/11/2010 08:05 Adam Vande More said the following: > As a follow-up, after applying both patches presented in this thread(FreeBSD > 8.2-PRERELEASE #5: Thu Nov 25 19:14:00 CST 2010), > > http://lists.freebsd.org/pipermail/freebsd-stable/2010-November/060298.html > > "top -m io" now displays much more info and is generally consistent with > gstat in that IO spikes occer around the same time. However, gstat and "top > -m io" are still not displaying any stats for 90%+ of my hard drive > indicator light blinks. Since the issue effects gstat as well, it doesn't > seem like it could be related to ZFS. When the system is basically idling, > the only consistent IO related entries are these; > > 6 root 15 0 1 12 0 13 20.00% > {l2arc_feed_threa} > 6 root 15 0 1 12 0 13 20.00% > {arc_reclaim_thre} > 6 root 15 0 1 12 0 13 20.00% {zvol > zoot/usr/ho} > 6 root 15 0 1 12 0 13 20.00% > {txg_thread_enter} > 6 root 15 0 1 12 0 13 20.00% > {txg_thread_enter} > > Entries like these occur like clockwork on 30 sec intervals. My theory here > is that since the ZVOL has UFS + SU, this is causing a sync? > > What I'm trying to diagnose is a much more frequent hard drive access which > occurs on approximately 2 sec intervals. I timed this by pinging localhost > and comparing the response to the blinks. It's very consistent although not > completely so as once in awhile the blink occurs every second. If I listen > carefully I can hear increased drive activity during many of these intervals > so the indicator light seems to be working correctly. > > If anyone has ideas or tests they'd like me to run, it would be appreciated. >
Perhaps it's some external component? E.g. hald is known to perform some disk/media checks every two seconds. -- Andriy Gapon _______________________________________________ freebsd-stable@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-stable To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
