hp workstations zx6000, hp server rx2600 - operation and maintenance guide

Product Information
Hot-Swappable/Pluggable Devices
Chapter 1
26
The hot-plug process allows you to replace a defective disk drive in a high-availability
system while it is running.
HP-UX’s Hot-Plug Process
NOTE The ability to hot plug the hard disk drive(s) on an HP-UX operating system requires
MirrorDisk/UX (Product Number B2491BA on HP-UX TCOE 11i V1.6).
In the context of replacing a failed disk drive, the system administrator must determine
which disk has failed. Depending on how the system was set up, the identity of the failed
drive may or may not be obvious. This determination may be done in either of two ways:
• Tracking the error message written by the LVM (Logical Volume Manager) to the
system console and/or a log file. For information on LVM commands, see the man
pages for vgchange, lvreduce, vgfgrestore, lvlnboot, lvextend, lvsync, etc.
• If installed, run the diagnostic utility Support Tool Manager (xstm) to determine
disk malfunction.
The removal of a defective disk drive from an active file system is supported through
LVM commands if hot-pluggable disks have been configured into the HP-UX file system
with LVM. To provide high availability, without impact to users, the disks must also be
configured as mirrored disks. Disk-mirroring is accomplished through use of the
MirrorDisk/UX software (HP part number B2491BA); for information on classes, see
http://www.hgp.com/education/courses/h628s.html.
No graphical user interface is currently offered through the System Administrator
Manager (SAM) for doing the required LVM commands because manipulation of the
LVM requires specialized knowledge that only experienced system administrators are
expected to have (see below for details).
Hot-Plug Example
The following example describes a particular system problem where the solution is to
replace a hot-plug disk module.
Volume group /dev/vg00 contains the two disks, with the logical volume configuration
as shown:
hardware address 10/0/12/0.0 10/0/13/0.0
device file (/dev/dsk/) c2t6d0 c2t5d0
Table 1-1 Example Configuration
Volume Description Volume Description
Logical Volume 1 Logical Volume 3
Logical Volume 2 Logical Volume 4
Logical Volume 3 Logical Volume 5