Veritas Volume Manager 5.0.1 Administrator's Guide, HP-UX 11i v3, First Edition, November 2009

Figure 12-1
Example of hot-relocation for a subdisk in a RAID-5 volume
mydg01
mydg01-01
mydg02
mydg02-01
mydg02-02
mydg03
mydg03-01
mydg03-02
mydg04
mydg04-01
mydg05
Disk group contains five disks. Two RAID-5 volumes are configured
across four of the disks. One spare disk is availavle for hot-relocation.
a
mydg01
mydg01-01
mydg02
mydg02-01
mydg02-02
mydg03
mydg03-01
mydg03-02
mydg04
mydg04-01
mydg05
Subdisk mydg02-01 in one RAID-5 volume fails. Hot-relocation replaces it with
subdisk mydg05-01 that it has created on the spare disk, and then initiates
recovery on the RAID-5 volume.
b
mydg01
mydg01-01 mydg05-01
mydg05-01
mydg02
mydg02-01
mydg02-02
mydg03
mydg03-01
mydg03-02
mydg04
mydg04-01
mydg05
Spare disk
RAID-5 recovery recreates subdisk mydg02-01's data and parity on subdisk
mygd05-01 from the data and parity information remaining on subdisks
mydg01-01 and mydg03-01.
c
Partial disk failure mail messages
If hot-relocation is enabled when a plex or disk is detached by a failure, mail
indicating the failed objects is sent to root. If a partial disk failure occurs, the
mail identifies the failed plexes. For example, if a disk containing mirrored volumes
fails, you can receive mail information as shown in the following example:
To: root
Subject: Volume Manager failures on host teal
Failures have been detected by the Veritas Volume Manager:
failed plexes:
home-02
src-02
435Administering hot-relocation
How hot-relocation works