Shaohua Li left as an exercise for the reader: > Thanks for the testing. We can't improve the quality of the new feature if > nobody tests it. Yep, the write journal isn't mature yet, but I can't imagine > the data loss. With write journal, data is written to the ssd first, then to > raid disks and IO is finished at that time. So if IO is finished, the data > should be in raid disks. The only possible way to data loss is the recovery. > But it's also possible filesystem/writeback hasn't flushed data to disk yet. > I'm wondering if you can reproduce it with/without journal, so we can narrow > down it a bit. I doubt it can be replaced without the journal -- like I said, I've been using mdadm RAID[56] for over a decade, and never seen such a problem. I'll attempt to reproduce with the journal enabled. Assuming I can, I can try to reproduce without, but I doubt it'll be fruitful. Are there any debugging options / flags I should enable prior reproducing in order to get a more complete report? Some state I should dump from my array and filesystems? Feel free to be technical. I owe a lot to Linux MD RAID, and am happy to put some effort into running this down. I'll report whether I can at least reproduce ASAP. --nick -- nick black -=- http://www.nick-black.com to make an apple pie from scratch, you need first invent a universe.
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