Andreas Dilger schrieb:
I'm CCing the linux-raid mailing list, since I suspect they will be interested in this result. I would suspect that the "journal guided RAID recovery" mechanism developed by U.Wisconsin may significantly benefit this workload because the filesystem journal is already recording all of these block numbers and the MD bitmap mechanism is pure overhead.
Also, using anticipatory IO scheduler seems to be the best option for an array with lots of seeks and random reads and writes (quite surprisingly, closely followed by NOOP - both were behaving much better than deadline or CFQ).
Here are some numbers I posted to BackupPC mailing list: http://thread.gmane.org/gmane.comp.sysutils.backup.backuppc.general/14009 -- Tomasz Chmielewski http://wpkg.org - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
