Mark Lord wrote:
Tejun Heo wrote:
Hello,
Mark Lord wrote:
Tejun.. do we do a FLUSH CACHE before issuing a non-NCQ command ?
Nope.
If not, then I think we may need to add code to do it.
Hmm... can you explain a bit more? That seems rather extreme to me.
..
You may recall that I first raised this issue about a year ago,
when my own RAID0 array (MythTV box) started showing errors very
similar to what Chris is reporting.
These were easily triggered by running hddtemp once every few seconds
to log drive temperatures during Myth recording sessions.
hddtemp uses SMART commands.
The actual errors in the logs were command timeouts,
but at this point I no longer remember which opcode was
actually timing out. Disabling the onboard write cache
immediately "cured" the problem, at the expense of MUCH
slower I/O times.
..
Speaking of which..
Chris: I wonder if the errors will also vanish in your situation
by disabling the onboard write-caches in the drives ?
Eg. hdparm -W0 /dev/sd?
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