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Media Processing Server System Operator’s Guide

Page 144 # P0602484 Ver: 2.7

Backing Up and Maintaining a Mirrored System Drive

The mirrorbu script backs up mirrored systems. The following is an overview of

mirrorbu execution. For complete details, refer to the MPS Disk Mirroring

Installation, Configuration and Recovery manual.

• Mirrorbu can only be run on systems that have active, synchronized mirrors.

• Each filesystem (except root) is write-locked momentarily while one of its

mirrors is taken offline. Anything that attempts to write to the locked

filesystem hangs until it is unlocked, therefore, run mirrorbu during a time

when the system is least active. Once the mirror is offline, the filesystem is

unlocked (write allowable). The filesystem is not mirrored while offline.

• ufsdump is executed to dump the offline mirror to tape. Filesystems are

dumped consecutively to the tape. If the tape becomes full, a prompt appears

to insert another tape. To place each filesystem dump on a separate tape,

specify the -o option on the mirrorbu command line. A prompt appears for

a new tape for every filesystem when the -o option is specified.

• The mirror is brought back online when the ufsdump is complete, and mirror

resynchronization occurs automatically.

• This procedure takes between 1 hour to several hours, depending on the

amount of data being backed up.

• Mirrorbu dumps the mirrored system drive only. Backup the mmf

filesystem(s) separately.

• If mirrorbu is invoked by a cron job, check the cron log in /var/log and the

mirrorbu log in /etc/mirrorBUdata. Also check mail for the root user.

The backup will not complete if it requires a tape change when invoked via

cron.

Preparation

Perform the following steps prior to executing mirrorbu. Some information must be

recorded for later restoration.

1. Login as root. (Execute su - ).

2. Choose a backup time when the system is least active. Since the mirror is

taken offline and dumped, it is not necessary to terminate applications.

However, there is a time when the filesystem is locked that can cause an

application write to hang. The filesystem is locked while the mirror is

taken offline, then immediately unlocked. The offline mirror is then

dumped and the mirror is taken online. Extensive writes to the unmirrored

primary slice could generate a small performance degradation when the

mirror is taken online and forced to synchronize.

3. Determine the number of tapes required. Execute df -k and add up the

usage for all the displayed system disk slices, to determine the number of

tapes required. The space allocation listed under the “used” heading is in

kbytes when the -k option is used. All system disk slices shown in the df

command output should be backed up, with the exception of swap. Swap

does not need to be backed up because it contains temporary data.

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