On Sun, 20 Jul 2014 21:15:31 +0200 Bob Marley <bobmarley@xxxxxxxxxxxxx> wrote: > Hi TM, are you doing other significant filesystem activity during this > rebuild, especially random accesses? > This can reduce performances a lot on HDDs. > E.g. if you were doing strenous multithreaded random writes in the > meanwhile, I could expect even less than 5MB/sec overall... I believe the problem here might be that a Btrfs rebuild *is* a strenuous random read (+ random-ish write) just by itself. Mdadm-based RAID would rebuild the array reading/writing disks in a completely linear manner, and it would finish an order of magnitude faster. -- With respect, Roman
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