On 01/22/2013 12:05 AM, Sage Weil wrote: > We observed an interesting situation over the weekend. The XFS volume > ceph-osd locked up (hung in xfs_ilock) for somewhere between 2 and 4 > minutes. ... FWIW I see this often enough on cheap sata drives: they've a failure mode that makes sata driver timeout, reset the link, resend the command, rinse, lather, repeat. (You usually get "slow to respond, please be patient" and/or "resetting link" in syslog & console.) It's at the low enough level to freeze the whole system for minutes. -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu
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