Explanation of SCSI Error on Linux Boot: "sda: I/O error: dev 08:00, sector 0" (Doc ID 556776.1)

Last updated on SEPTEMBER 28, 2015

Applies to:

Linux OS - Version 2.4.21 to 2.6
Linux x86-64
Linux x86
Linux x86-64

Symptoms

When booting, even though the HDD's are registered in /proc/scsi/scsi,  error messages are reported:

sda : READ CAPACITY failed.
sda : status = 1, message = 00, host = 0, driver = 08
Current sd00:00: sense key Illegal Request
Additional sense indicates Logical unit not supported
sda : block size assumed to be 512 bytes, disk size 1GB.
SCSI device sda: 2097151 512-byte hdwr sectors (1074 MB)
sda: I/O error: dev 08:00, sector 0
I/O error: dev 08:00, sector 0
unable to read partition table
sdb : READ CAPACITY failed.
sdb : status = 1, message = 00, host = 0, driver = 08
Current sd00:00: sense key Illegal Request
Additional sense indicates Logical unit not supported
sdb : block size assumed to be 512 bytes, disk size 1GB.
SCSI device sdb: 2097151 512-byte hdwr sectors (1074 MB)
sdb: I/O error: dev 08:10, sector 0
I/O error: dev 08:10, sector 0
unable to read partition table

Changes

This occurs when the server has a CLARiiON Storage array. If configured for multipath, the error will occur for each path.

Cause

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