On Tue, Feb 28, 2012 at 12:48:13PM +1100, Dave Chinner wrote: > > Write cache: enabled > > There's your problem. You should read all the relevant sections on > write caches in the XFS FAQ. e.g: > > http://xfs.org/index.php/XFS_FAQ#Q._Which_settings_does_my_RAID_controller_need_.3F As a side question to this: if I am using Linux's md software RAID with an HBA, and XFS is using write barriers (as I believe it does by default), is it still necessary to disable write caching on the drives? My reading of the FAQ suggests that the write barrier by itself should be sufficient - but this requires that the md RAID driver implements write barriers correctly. I seem to remember reading a long time ago that LVM and/or dmraid didn't, although that may be different now. Incidentally I'm using 'mdadm ... -b internal' to ensure that the RAID array marks dirty areas, so that if a write part-completes (e.g. a block is written to only one half of a RAID1) then at next power-up this should be made consistent again. Regards, Brian. _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
