VERITAS Volume Manager 4.1 Administrator's Guide

Administering Hot-Relocation

Moving and Unrelocating Subdisks

Chapter 9348

subdisk is moved back to the original disk or to a new disk using

vxunreloc, the information is erased. The original disk-media name and

the original offset are saved in the subdisk records. To print all of the

subdisks that were hot-relocated from disk01 in the rootdg disk group,

use the following command:

# vxprint -g rootdg -se 'sd_orig_dmname="disk01"'

Restarting vxunreloc After Errors

vxunreloc moves subdisks in three phases:

Step 1. vxunreloc creates as many subdisks on the speciﬁed destination disk as

there are subdisks to be unrelocated. The string UNRELOC is placed in the

comment ﬁeld of each subdisk record.

Creating the subdisk is an all-or-nothing operation. If vxunreloc cannot

create all the subdisks successfully, none are created, and vxunreloc

exits.

Step 2. vxunreloc moves the data from each subdisk to the corresponding newly

created subdisk on the destination disk.

Step 3. When all subdisk data moves have been completed successfully,

vxunreloc sets the comment ﬁeld to the null string for each subdisk on

the destination disk whose comment ﬁeld is currently set to UNRELOC.

The comment ﬁelds of all the subdisks on the destination disk remain

marked as UNRELOC until phase 3 completes. If its execution is

interrupted, vxunreloc can subsequently re-use subdisks that it created

on the destination disk during a previous execution, but it does not use

any data that was moved to the destination disk.

If a subdisk data move fails, vxunreloc displays an error message and

exits. Determine the problem that caused the move to fail, and ﬁx it

before re-executing vxunreloc.

If the system goes down after the new subdisks are created on the

destination disk, but before all the data has been moved, re-execute

vxunreloc when the system has been rebooted.

CAUTION Do not modify the string UNRELOC in the comment ﬁeld of a subdisk

record.