On Thursday June 15, niccolo@xxxxxxxxxxx wrote: > On Wed, Jun 14, 2006 at 10:46:09AM -0500, Bill Cizek wrote: > > Niccolo Rigacci wrote: > > > > >When the sync is complete, the machine start to respond again > > >perfectly. > > > > > I was able to work around this by lowering > > /proc/sys/dev/raid/speed_limit_max to a value > > below my disk thruput value (~ 50 MB/s) as follows: > > > > $ echo 45000 > /proc/sys/dev/raid/speed_limit_max > > Thanks! > > This hack seems to solve my problem too. So it seems that the > RAID subsystem does not detect a proper speed to throttle the > sync. The RAID subsystem doesn't try to detect a 'proper' speed. When there is nothing else happening, it just drives the disks as fast as they will go. If this is causing a lockup, then there is something else wrong, just as any single process should not - by writing constantly to disks - be able to clog up the whole system. Maybe if you could get the result of alt-sysrq-P or even alt-sysrq-T while the system seems to hang. 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
