Paolo Ornati wrote:
If mounting XFS with "nobarrier" fixes the problem it seems that more than one Seagate disk cannot handle the Cache Flush command while other commands are in fly...
It's not allowed to overlap NCQ (FPDMA read/write) commands with any other commands such as cache flushes. libata core guarantees that this doesn't happen by deferring such requests until the FPDMA commands are complete. (At least, it's supposed to..)
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