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dmesg: "BLK_EH_NOT_HANDLED" and "Enter sas_scsi_recover_host"



Hello,

today I found the following in the dmesg log:

[Tue Jul 22 01:19:55 2014] sas: command 0xffff880836c239c0, task
0xffff8804d2801800, timed out: BLK_EH_NOT_HANDLED
[Tue Jul 22 01:19:55 2014] sas: command 0xffff8807ba958780, task
0xffff8806e111ed80, timed out: BLK_EH_NOT_HANDLED
[Tue Jul 22 01:19:55 2014] sas: command 0xffff880833b0a480, task
0xffff8803992cd380, timed out: BLK_EH_NOT_HANDLED
[Tue Jul 22 01:19:58 2014] sas: Enter sas_scsi_recover_host
[Tue Jul 22 01:19:58 2014] sas: trying to find task 0xffff8804d2801800
[Tue Jul 22 01:19:58 2014] sas: sas_scsi_find_task: aborting task
0xffff8804d2801800
[Tue Jul 22 01:19:58 2014] sas: sas_scsi_find_task: task
0xffff8804d2801800 is done
[Tue Jul 22 01:19:58 2014] sas: sas_eh_handle_sas_errors: task
0xffff8804d2801800 is done
[Tue Jul 22 01:19:58 2014] sas: trying to find task 0xffff8806e111ed80
[Tue Jul 22 01:19:58 2014] sas: sas_scsi_find_task: aborting task
0xffff8806e111ed80
[Tue Jul 22 01:19:58 2014] sas: sas_scsi_find_task: task
0xffff8806e111ed80 is done
[Tue Jul 22 01:19:58 2014] sas: sas_eh_handle_sas_errors: task
0xffff8806e111ed80 is done
[Tue Jul 22 01:19:58 2014] sas: trying to find task 0xffff8803992cd380
[Tue Jul 22 01:19:58 2014] sas: sas_scsi_find_task: aborting task
0xffff8803992cd380
[Tue Jul 22 01:19:58 2014] sas: sas_scsi_find_task: task
0xffff8803992cd380 is done
[Tue Jul 22 01:19:58 2014] sas: sas_eh_handle_sas_errors: task
0xffff8803992cd380 is done
[Tue Jul 22 01:19:58 2014] sas: --- Exit sas_scsi_recover_host
[Tue Jul 22 02:37:44 2014] sas: command 0xffff8805d646b1c0, task
0xffff88011b92d080, timed out: BLK_EH_NOT_HANDLED
[Tue Jul 22 02:37:44 2014] sas: command 0xffff8805d646b3c0, task
0xffff880429903940, timed out: BLK_EH_NOT_HANDLED
...

It seems there is something wrong with scsi.
Perhaps the controller or the disk?
What does this mean?
What should I do?

Best Regards,
basti


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