On Sat, August 1, 2009 5:05 am, Fredrik Andersson wrote: > Hi, I have a bunch of machines running Linux 2.6.29.1 on x86_64 which > are running Linux software raid consisting of two disk partitions > merged into a single raid0 in /dev/md0. This setup is for performance > reasons. > The OS is not run from the raid, it is only used to hold a set of data > files. > > This seems to work great for weeks to months at a time, but then all > of a sudden access to the raid filesystem completely locks up. A > process trying to access any file in there hangs to the point where it > cannot be killed even with -9, so I suppose it's locked up in a > syscall. > I can't attach a debugger to the process, for then the terminal locks > up too. But the system is operational as long as I don't read anything > from the raid mount. > > Th only thing that helps is a reboot. Then the raid will function > correctly again. > > The version of mdadm is v2.6.7.1 - 15th October 2008. > > Here is my /etc/mdadm.conf: > DEVICE /dev/sda5 > DEVICE /dev/sdb3 > ARRAY /dev/md0 devices=/dev/sda5,/dev/sdb3 > > /proc/mdstat from a locked machine: > Personalities : [raid0] > md0 : active raid0 sda5[0] sdb3[1] > 898362368 blocks 256k chunks > > unused devices: <none> > > The raid has an ext4 filesystem on it. In that case, I would suggest that it is much more likely to be an ext4 problem than an md/raid problem. raid0 is very simple and is extremely unlikely to cause anything like that again. If you have a system with processes that are hung like this, I would recommend echo t > /proc/sysrq-trigger which will cause a stack trace of every process to be written to the kernel log. This can show exactly where processes are hanging. NeilBrown > > I can find no other logs or status files for the software raid system. > There's nothing in /var/log/messages or any other standard log. > > Does anybody know what is going on? Is this a known bug in md or the > kernel? > > Thank you for any help! > > Fredrik > -- > 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 > -- 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
