On Tue, Dec 22 2015, Tejas Rao wrote: > What if the application is doing the locking and making sure that only 1 > node writes to a md device at a time? Will this work? How are rebuilds > handled? This would be helpful with distributed filesystems like > GPFS/lustre etc. > You would also need to make sure that the filesystem only wrote from a single node at a time (or access the block device directly). I doubt GPFS/lustre make any promise like that, but I'm happy to be educated. rebuilds are handled by using a cluster-wide lock to block all writes to a range of addresses while those stripes are repaired. NeilBrown
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