Re: [bug report] raid0 array mkfs.xfs hang

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Keith,

> Your change looks fine, though it sounds odd that md raid is changing
> queue_limit values outside the limits_lock. The stacking limits should
> have set the md device to 0 if one of the member drives doesn't
> support write_zeroes, right?

SCSI can't reliably detect ahead of time whether a device supports WRITE
SAME. So we'll issue a WRITE SAME command and if that fails we'll set
the queue limit to 0. So it is "normal" that the limit changes at
runtime.

I'm debugging a couple of other regressions from the queue limits
shuffle so I haven't looked into this one yet. But I assume that's
what's happening.

-- 
Martin K. Petersen	Oracle Linux Engineering




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