Neil, While redoing the reboot test, I've also noticed this : When I first issue the --grow command, I see the following in dmesg : [192752.106467] md: reshape of RAID array md0 [192752.106473] md: minimum _guaranteed_ speed: 200000 KB/sec/disk. [192752.106479] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for reshape. The minimum guaranteed speed should be 1000KB/sec according to the entry in /proc/sys/dev/raid/speed_limit_min. Also, the performances are not really good. I have about 400K/sec according to /proc/mdstat. Now, if I stop the array and assemble it again, things are better. The output in dmesg displays the correct value : [193138.646204] md: minimum _guaranteed_ speed: 1000 KB/sec/disk. [193138.646210] md: using maximum available idle IO bandwidth (but not more than 200000 KB/sec) for reshape. And perf are much better, I now get ~1500K/s which shrinks the time of the reshape from ~2 weeks to 'only' a few days. Any thoughts ? HTH, Guy On Thu, 22 Oct 2009 10:44:53 +1100 Neil Brown <neilb@xxxxxxx> wrote: > Thanks for helping make mdadm even better! > > NeilBrown > -- 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
