Buffer IO error on Device /dev/sdb

[vishnu_sonde]

Hi All,
I have a one problem when i mapped a SAN to the linux box RHEL 5.3
i show the following messeage
Buffer IO error on Device /dev/sdb
and unable to find it in fdisk -l

Can somebody help me ?

[Irithori]

You dont provide much information,
but it sounds like the device sdb was there at a point in time
and then something/someone forcefully removed it again.

Possible causes can include:
- FC cable removed or
- zoning wrongfully enforced on the switch, so that the hba cannot connect to the disk anymore
- you mentioned mapping: are you sure, you mapped the disk to the correct hba?

[vishnu_sonde]

Hi Irithori,
I have done zoning successfully also FC cable is not removed.
It shows in cat /proc/partitions but does not show in fdisk -l


Thanks,
Vishnu