+++ Kent Overstreet [2012-10-04 12:51:30]: > On Thu, Oct 04, 2012 at 04:06:25PM +0530, Kingsly John wrote: > > Hi! > > > > In the archives I found a thread from a few months ago where it was > > recommended that it's best to use bcache on the RAID layer.(rather than the > > disks themselves or LVM) > > > > Wouldn't this affect bcache's ability to recover from an unclean shutdown? > > ie, if the raid array itself can't be brought up, bcache wouldn't be able to > > write caches to disk? (Or is that not a possibility) > > Not sure what you're asking...
If /dev/md0 is the backing device, in the event of an unclean shutdown during a write it would be dirty(at the raid level) and there would be a resync etc. If the individual disks that make make up /dev/md0 were backing devices instead, wouldn't bcache ensure that /dev/md0 would never end up dirty when recovering from an unclean shutdown and eliminate the need for a forced resync? Is one better than the other in terms of maintaining data integrity or would they both be equally reliable? Kingsly -- -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
