Hi all I am struggling to diagnose a strange freeze of software RAID5 array. My RAID5 consists of 4 Toshiba SATA drives and has ext4 filesystem on top of it. It works fine unless I start several process writing intensively to it. At first, it looks like the system is under high pressure, then the system starts lagging a lot and a hard freeze always follows after several minutes. No errors in system log, nothing is emitted to console. Just hard freeze with HDD light always on. I tried enabling kernel network logging to another machine and again no information when hanging. After reboot, my array starts reconstruction and finishes without errors. I tried disabling quotas and barriers for ext4. After disabling barriers, it almost seemed to work, but after some time the same hard freeze happens. I tested the same hardware configuration under Linux v3.10, 3.11, 3.12 and now 3.13.5 (all x86 arch) behaves the same way. The same issue can be reproduced easily. So now I tested everything Google suggests on the matter. Could you give a hint on how to debug this issue? BR, Denis -- 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
