Re: 'Device not ready' issue on mpt2sas since 3.1.10

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Hello Tejun,

Am 22.07.2012 19:31, schrieb Tejun Heo:>
> I haven't consulted SAT but it seems like a bug in SAS driver or
> firmware.  If it's a driver bug, we better fix it there.  If a
> firmware bug, working around those is one of major roles of drivers,
> so I think setting allow_restart is fine.

as it turns out my workaround (setting allow_restart=1) isn't all that
useful after all. There are no more i/o errors because the drive just
never goes to standby mode anymore (at least 'hdparm -y /dev/sda' does
not seem to have any effect anymore). I don't really understand why - do
sas drives ever get to standby mode? (they have allow_restart=1 set by
default) And is this desired or expected behavior for sata disk on sas

For the moment the only way for me to have my sata drives sleeping
without i/o errors is to revert your original commit
(85ef06d1d252f6a2e73b678591ab71caad4667bb - tested with kernels 3.1.10,
3.4.4, 3.4.5, 3.4.6 and 3.5.0)


P.S. I hope I'm not getting on everybody's nerves here (especially yours
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