DISK REPLACEMENT

• Reduce the mirror copies for the LVs from the faulty disk.
• #unmirrorvg vg_name hdiskX
• remove the faulty disk from the "database" volume group
• #reducevg vg_name hdiskX
• remove the hdisk devices for the faulty disk
• #rmdev –l hdiskX –d
• Set service mode on disk if possible
• #diag command  Task Selection (Diagnostics, Advanced Diagnostics, Service Aids, etc.)..
• Physically remove the disk from the system
• Insert the replacement disk
• Turn off service mode
• Run cfgmgr to make the replacement disk available
• Certify the replacement disk and assuming the disk certifies with no errors...
• #diag command  Task Selection (Diagnostics, Advanced Diagnostics, Service Aids, etc.)..
• Add the replacement disk to the "database" volume group
• Make the LV copies for the LVs
• resync the volume group

"Accept changes " I recommand bellow book
Who Moved My Cheese?: An Amazing Way to Deal with Change in Your Work and in Your Life