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Getting the following in /var/log/messages:

Sep 17 10:38:53 server1 kernel: end_request: I/O error, dev sde, sector 0
Sep 17 10:38:53 server1 kernel: end_request: I/O error, dev sde, sector 63
Sep 17 10:38:53 server1 kernel: end_request: I/O error, dev sde, sector 208845

In addition, any time an lvm utility runs, before the results are returned (properly), the following is shown:

/dev/sde: read failed after 0 of 4096 at 0: Input/output error
/dev/sde1: read failed after 0 of 2048 at 0: Input/output error
/dev/sde2: read failed after 0 of 2048 at 0: Input/output error

fdisk -l does not show such a device and returns no errors. Also nothing in mount or fstab. I can't find anything about this device, other than its listing in /dev and the errors show above. This is a live server, I would rather not have to resort to a reboot if it can be avoided.

CentOS 5.5 , LSI hardware SAS RAID , dual quad-core Xeon, 16GB RAM

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After a reboot, can you do ‛dmesg | grep sde‛ and show the results? –  ott-- Sep 17 '12 at 18:43
    
Eventually yes, I'm still waiting for some ideas from others that may not require a reboot. –  prl77 Sep 18 '12 at 16:26
    
Or try that without reboot, maybe your buffer is big enough. –  ott-- Sep 18 '12 at 19:30
    
It's a mix of the end_request errors as above, plus this: Buffer I/O error on device sde, logical block 0 Buffer I/O error on device sde, logical block 1 Buffer I/O error on device sde, logical block 2 Buffer I/O error on device sde, logical block 3 –  prl77 Sep 19 '12 at 21:00
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