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. Martin -- 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
