1)check the errot messages like kernel and I/O related

errors in /var/adm/messages file.if any disk having 2 write

errore and 10 read errors it is supposed toe Bad disk.

2)check logical and phsical path of that bad hard disk

using the command eeprom show-devs.

3)after that we have to genetae the ticket to the concern

team

4)take the full backup of that disk.

5)After taking the permission we need to change the disk

with timestamps.