I've been noticing regular writing activity to my data pool while the
system's relatively idle, just a little read IO. Turns out the
system's writing up to 20MB of data to the pool every 15-30 seconds.
Using iotop from the DTrace Toolkit, apparently the process
responsible is sched. What's going on here? Playing back a simple
video file wouldn't generate enough metadata changes to create that
much updates.
Did you disable 'atime' updates for your filesystem? Otherwise the file
access times need to be periodically updated and this would happen may
every 15-30 seconds.
Not disabled. But 20MB worth of metadata updates while the system
practically does nothing? Only real things happening is a video
playbacking and XChat logging relatively few things to disk.
-mg
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