3tcdgwg3 wrote: > If there is a plan to do a "intelligent resync", like some of the raid > controller > vendors offer? The resync process will be hold on, if there are IO requests > from upper level, and resumed when there is no IO. By doing that, the > system > performance always be on the top. I am very interested in having something > like that. This wasn't exactly what I meant by intelligent resync, but...I think what you're asking about is something that the md driver already does to some extent. It will slow down a resync if there is active I/O on the device. This can even be tuned by the user by manipulating a couple of kernel sysctls: apache:~# cat /proc/sys/dev/raid/speed_limit_min 100 apache:~# cat /proc/sys/dev/raid/speed_limit_max 10000 apache:~# echo 1000000 > /proc/sys/dev/raid/speed_limit_max apache:~# cat /proc/sys/dev/raid/speed_limit_max 1000000 These are in KB/s. The "min" refers to the maximum I/O bandwidth that will be consumed by resyncs before the resyncs get throttled, when there is other I/O activity on the device. The "max" refers to the maximum I/O bandwidth that will be consumed by resyncs before the resyncs get throttled, even if there is no other I/O activity on the device. -- Paul - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
