SAS controller on HPUX itanium disk replace

The SAS controller in the first generation BL860C (and other models) has some special commands in order to replace a failed disk.  I would recommend using the built-in RAID-1 capabilities of this controller - that way you no longer need to worry about LVM mirroring.  But if you need to use LVM mirroring then, add the couple steps below to your standard LVM mirror root/boot disk procedure:

#get the SAS controller dsf:

saslist get_info ctrl sasd

#get info on the disks:

sasmgr get_info -D /dev/sasd0 -q raid

#if the disk is working enough to turn on the attention LED:

sasmgr set_attr -D /dev/sasd0 -q lun=/dev/dsk/c0t1d0 -q locate_led=on

AFTER the disk is replaced:

#since each disk will have a unique WWID, the server will assign a new HW path and persistent dsf

#to change them first change the hardware path (legacy style)

sasmgr replace_tgt -D /dev/sasd0 -q old_tgt_hwpath=0/2/1/0.0.0.1.0 -q new_tgt_hwpath=0/2/1/0.0.0.2.0

#then change the persistent dsf

io_redirect_dsf -d /dev/disk/disk3 -n /dev/disk/disk8