disk io error

its_ns_04
its_ns_04 used Ask the Experts™
on
Hi,

In my Red Hat 5 box, it is reporting weird message:

Device sdq not ready.
end_request: I/O error, dev sdq, sector 558727040
Device sdq not ready.
end_request: I/O error, dev sdq, sector 558727152
Device sdq not ready.
end_request: I/O error, dev sdq, sector 0
Device sdq not ready.
end_request: I/O error, dev sdq, sector 8
Device sdq not ready.
end_request: I/O error, dev sdq, sector 0
Device sdax not ready.
end_request: I/O error, dev sdax, sector 0
Device sdax not ready.
end_request: I/O error, dev sdax, sector 558727040
Device sdax not ready.
end_request: I/O error, dev sdax, sector 558727152
Device sdax not ready.
end_request: I/O error, dev sdax, sector 0
Device sdax not ready.
end_request: I/O error, dev sdax, sector 8
Device sdax not ready.
end_request: I/O error, dev sdax, sector 0
Device sds not ready.
end_request: I/O error, dev sds, sector 0
Device sds not ready.
end_request: I/O error, dev sds, sector 69185920
Device sds not ready.
end_request: I/O error, dev sds, sector 69186032
Device sds not ready.
end_request: I/O error, dev sds, sector 0
Device sds not ready.
end_request: I/O error, dev sds, sector 8
Device sds not ready.
end_request: I/O error, dev sds, sector 0
Device sdai not ready.
end_request: I/O error, dev sdai, sector 0
Device sdai not ready.
end_request: I/O error, dev sdai, sector 558727040
Device sdai not ready.
end_request: I/O error, dev sdai, sector 558727152
Device sdai not ready.
end_request: I/O error, dev sdai, sector 0
Device sdai not ready.
end_request: I/O error, dev sdai, sector 8
Device sdai not ready.
end_request: I/O error, dev sdai, sector 0
Device sdd not ready.
end_request: I/O error, dev sdd, sector 0
Device sdd not ready.
end_request: I/O error, dev sdd, sector 69185920
Device sdd not ready.
end_request: I/O error, dev sdd, sector 69186032
Device sdd not ready.
end_request: I/O error, dev sdd, sector 0
Device sdd not ready.
end_request: I/O error, dev sdd, sector 8
Device sdd not ready.
end_request: I/O error, dev sdd, sector 0
Device sdt not ready.
end_request: I/O error, dev sdt, sector 0
Device sdt not ready.

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I don't have any devices sdt,sdia,sds and so on... any ideas what could be going on wrong ?
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Check when they are happening, those look like boot messages before the drivers are loaded. As for references to devices that you don't have or have sector 8 or 0; do they show up in your fdisk -l? what about in the device tree /dev?
Information about timing would be very beneficial.  If it happens during boot-up or when a certain device gets plugged-in would be beneficial.  As recommended by jgiordano, it would be very helpful to see a listing of things in the "/dev" folder (i.e. "ls -l /dev/").
Commented:
is your RHEL 5 system attached with SAN disks? are you using device-mapper-multipath?
to solve this issue, modify the filter so that LVM commands scan /dev/mapper devices and do not scan the /dev/sdX devices (other than the root disk):

   1. Edit /etc/lvm/lvm.conf:

   2. Find the "filter" section that looks like:
       filter = [ "a/.*/" ]

   3. Change it to filter out all devices except the ones you specify with the add tag a|/dev/$. In the filter line you specify which devices you want LVM to access with the a|<my device>| tag and which devices you want to remove with the r/.*/ tag. For example:

      # By default we accept every block device:
      #filter = [ "a/.*/" ]
      filter = [ "a|/dev/mapper|", "a|/dev/sda|", "r/.*/" ]

For a list of disks on your system that you must include, run pvscan | grep PV.  Be sure to include your root disk physical volume (pv) in your filter.

Note: The I/O messages are not harmful and should not cause any issues on a system as long as only passive paths show this error.

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