On re-reading the message I realized that my message was in danger of
being content-free.
gmirror whole-disk mirror of seagate 300gb drives
$ atacontrol list
ATA channel 0:
Master: ad0 <ST3300622A/3.AAH> ATA/ATAPI revision 7
Slave: ad1 <ST3300622A/3.AAH> ATA/ATAPI revision 7
$ gmirror list
Geom name: gm0
State: COMPLETE
Components: 2
Balance: round-robin
Slice: 4096
Flags: NONE
GenID: 0
SyncID: 1
ID: 575427344
Providers:
1. Name: mirror/gm0
Mediasize: 300069051904 (279G)
Sectorsize: 512
Mode: r5w5e6
Consumers:
1. Name: ad0
Mediasize: 300069052416 (279G)
Sectorsize: 512
Mode: r1w1e1
State: ACTIVE
Priority: 0
Flags: DIRTY
GenID: 0
SyncID: 1
ID: 3917165570
2. Name: ad1
Mediasize: 300069052416 (279G)
Sectorsize: 512
Mode: r1w1e1
State: ACTIVE
Priority: 0
Flags: DIRTY
GenID: 0
SyncID: 1
ID: 3874187635
On Nov 24, 2008, at 12:48 PM, Jo Rhett wrote:
I've spent about 3 months tracing down what was causing my personal
colo box to start getting "sluggish" right around dawn every
Saturday morning. It took so long because some mornings I simply
couldn't pull my head out of my tail enough to do proper debugging.
The cause was *really slow* filesystem response time. No cron jobs
in that period. No specific process ran any slower than another,
although I eventually learned that ones which did no file i/o were
fine. And finally I realized that just "ls -la" was very slow (~1
minute) even after I had killed off every disk-using process in the
system. SMTP and HTTP in particular were basically fubar.
No data loss, just *real slow*. Nothing other than a soft reboot
ever solved the problem. Even leaving it running only minimal
processes for 24 hours didn't bring it back to normal.
Finally I was browsing through Jeremy Chadwick's list of known ATA
problems and spotted his comments about smartd self-tests causing
problems. Sure enough, my long self test was scheduled for 5am on
Saturday mornings. Rechecking the observed slow-down periods
confirmed that the problem never became visible before 5am.
(sometimes it took up to 45 minutes before things slowed down enough
to set off monitoring alarms)
So, long story short, if you're having weirdness in system time
response - check the smartd configuration, and try disabling the
self tests. The short self test I was running daily didn't appear
to affect anything, but the long test was just bringing the system
to just shuddering and limping at best.
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