On Thu, Jan 16, 2014 at 11:51:52AM -0800, Ivan Novick wrote: > Hello, > > I am running a server with heavy workload on a XFS mount: > /dev/mapper/v2-d1 on /d/d1 type xfs (rw,nodev,noatime,inode64,allocsize=16m) > 2.6.32-424.el6.x86_64 #1 SMP Mon Oct 14 20:11:50 EDT 2013 x86_64 x86_64 > x86_64 GNU/Linux > > We get errors in log indicating processes are blocked for more than 120 > seconds. > > 1) Is this expected during heavy workload? > 2) What would be the impact on the processes? Are they basically hung in > userspace waiting for IO? > 3) Is there anything we tune here? > > Below is the output. > > Cheers, > Ivan Novick > > INFO: task flush-253:1:6882 blocked for more than 120 seconds. > Tainted: P --------------- 2.6.32-424.el6.x86_64 #1 Proprietary kernel module taint on a RHEL/centos kernel, so there's no guarantee anyone will be able to debug this here. If it's RHEL you are using, please report it through your support channels... > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > flush-253:1 D 0000000000000000 0 6882 2 0x00000000 > ffff881011fa5690 0000000000000046 0000000000000000 ffff881013cba040 > 0000000000000001 ffff88012a447d40 ffff881013cba040 ffff881016eb4830 > ffff881013cba5f8 ffff881011fa5fd8 000000000000fbc8 ffff881013cba5f8 > Call Trace: > [<ffffffff815289d3>] io_schedule+0x73/0xc0 > [<ffffffff81267d18>] get_request_wait+0x108/0x1d0 > [<ffffffff8109b4a0>] ? autoremove_wake_function+0x0/0x40 > [<ffffffff812618ce>] ? elv_merge+0x17e/0x1c0 > [<ffffffff81267e79>] blk_queue_bio+0x99/0x620 > [<ffffffff81266f00>] generic_make_request+0x240/0x5a0 Waiting for IO completion. Looks like you've either severely overloaded your storage subsystem, or it's died and isn't responding anymore. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
