On Wed, 27 Oct 2010 09:35:17 +0200 Martin Hamrle <martin.hamrle@xxxxxxxx> wrote: > Hi, > > I'm having this issue on several boxes with several configuration. > One of them is a box with 8 drives attached to ARC-1160 in pass through > mode and build sw raid5 from these drives. There is also one drive to OS. > > During resync or check and heavy IO load, process tscpd (tscpd is IO > load maker) hungs, the machine is still alive but there are many blocked > processes. > After tscpd hungs, IO load is generated only by resync. In traceback you > can see blocked processes (ps, htop cat) accessing tscpd cmdline in > proc. Some tscpd threads is blocked during writing files into fs on > raid5. Reading these files is also blocking, reading other files in > filesystem is fast as usual. This state takes 110 minutes. After that > all blocked processes continue their work. > > I am not sure what is the reason of the end of the weird state. I think > the end was caused by starting copying kernel source into array. > > Note that this is first time when hung processes wake up I never wait so > long. > > I think that it is related to sw raid because I do not see this issue on > hw raid or on sw raid without resync. > > kern.log contains initial "INFO: task collectd:2577 blocked for more > than 120 seconds" > and two dumps > echo w > /proc/sysrq-trigger > > log is located http://files.nangu.tv/kernel/kern.log > Let me know if you need more info. > When I try to access your kern.log I get 403 - Forbidden Just include it in-line in the email. 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
