xfssyncd and disk spin down

[Stan Hoeppner]

Petre Rodan put forth on 12/24/2010 12:02 AM:

>> fs.xfs.xfssyncd_centisecs	(Min: 100  Default: 3000  Max: 720000)
>> fs.xfs.age_buffer_centisecs	(Min: 100  Default: 1500  Max: 720000)
> 
> just increasing the delay until an inevitable and seemingly redundant disk write is not what I want.
> I was searching for an option to make internal xfs processes not touch the drive after the buffers/log/dirty metadata have been flushed (once).

I'm not a dev Petre but just another XFS user.  This is the best
"solution" I could come up with for your issue.  I assumed this
"unnecessary" regularly scheduled activity was a house cleaning measure
and done intentionally; didn't dawn on me that it may be a bug.

Sorry I wasn't able to fully address your issue.  If/until there is a
permanent fix for this you may want to bump this to 720000 anyway as an
interim measure, if you haven't already, as it should yield a
significantly better situation than what you have now.  You'll at least
get something like ~1400 minutes of sleep per day instead of none,
decreasing your load/unload cycles from ~2880/day to ~120/day, if my
math is correct.

-- 
Stan