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Top Forums UNIX for Dummies Questions & Answers what is disk mirroring in unix? Post 1712 by Neo on Monday 26th of March 2001 04:51:04 PM
In a nutshell, disk mirroring is when two disks are written with the same data at the same time. So, when you have critical data (critical SQL databases are a good example) the disks are often mirrored so if one disk crashes, a minimal amount of data is lost. You are correct, disk mirroring is related to system backup and recovery. Usually, backups are performed daily for critical systems. Disk mirroring provides for disk crash protection between backups, in almost real time.

BTW: Does anyone know of any good mirroring software for Linux? I think I'll mirror this site in the future! Many someday, the UNIX For Dummies archives will be 'critical' for users Smilie
Test Your Knowledge in Computers #756
Difficulty: Medium
The difference between EPROM and EEPROM is based on the way that the memory programs and erases.
True or False?

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volreattach(8)						      System Manager's Manual						    volreattach(8)

volreattach - Reattaches disk drives that have once again become accessible SYNOPSIS
/usr/sbin/volreattach [-rb] [accessname...] /usr/sbin/volreattach -c accessname OPTIONS
The volreattach utility has the following options: Calls the volrecover utility to attempt to recover stale plexes of any volumes on the failed disk. Performs the reattach operation in the background. Checks whether a reattach is possible. No operation is performed, but the name of the disk group and disk media name at which the disk can be reattached is displayed. DESCRIPTION
The volreattach utility attempts to reattach disks using the same disk group and media names they had before detachment. This operation may be necessary if a disk has a transient failure, or if some disk drivers are unloaded or unloadable when the Logical Storage Manager is started, causing disks to enter the failed state. If the problem is fixed, the volreattach command can be used to reattach the disks without plexes being flagged as stale, as long as the reattach happens before any volumes on the disk are started. The volreattach command is called from the voldiskadm menus as part of disk recovery. The volreattach utility tries to find a disk with a disk group and disk ID matching that of the disk(s) being reattached. If the matching disk is found, the reattach operation may still fail if the original cause (or some other cause) for the disk failure still exists. EXIT CODES
A zero exit status is returned if it is possible to perform a reattach. Otherwise, non-zero is returned. SEE ALSO
volintro(8), voldiskadm(8), volrecover(8) volreattach(8)

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