On Fri, Nov 11 2016, Wols Lists wrote: > On 10/11/16 02:00, NeilBrown wrote: >>> [ 8664.858104] xfsaild/md1(658): WRITE block 0 on md1 (8 sectors) >> This is XFS doing something. md cannot possibly stop all IO while the >> filesystem performs occasional IO. If these continue, you need to >> discuss with xfs developers how to stop it. If the writes to individual >> drives continue after there are no writes to 'md1', then it is worth >> coming back here to ask. >> >> > Would the new journal feature be any help? Probably not, though until we know what is causing the writes, it is hard to say. > > I haven't dug in enough to understand it properly, and it would increase > the vulnerability of the system to a journal failure, but the feature > itself seems almost perfect for batching writes and enabling the disks > to spin down for extended periods. You might be able to build functionality onto the journal which allows the drives in the main array to stay idle for longer, but it doesn't try to do that at present. NeilBrown
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