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Test Your Knowledge in Computers #107
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Each Unix kernel subsystem has key features like concurrency, virtual memory, paging, and a virtual file system.
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volrecover(8) [osf1 man page]

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

NAME
volrecover - Performs volume recovery operations SYNOPSIS
/sbin/volrecover [-g diskgroup] [-sb] [-o options] [volume | medianame...] OPTIONS
Options that can be specified to volrecover are: Starts disabled volumes that are selected by the operation. Volumes will be started before any other recovery actions are taken. Volumes will be started with the -o delayrecover start option. This requests that any opera- tions that can be delayed in starting a volume will be delayed. In other words, only those operations necessary to make a volume available for use will occur. Other operations, such as mirror resynchronization, attaching of stale plexes and subdisks, and recovery of stale RAID5 parity will normally be delayed. Performs recovery operations in the background. With this option, volrecover will put itself in the back- ground to attach stale plexes and subdisks, and to resynchronize mirrored volumes and RAID5 parity. If this is used with -s, volumes will be started before recovery begins in the background. Performs no recovery operations. If used with -s, volumes will be started, but no other actions will be taken. If used with -p, the only action of volrecover will be to print a list of startable volumes. Prints the list of selected volumes that are startable. For each startable volume, a line is printed containing the following information: the volume name, the disk group ID of the volume, the volume's usage type, and a list of state flags pertaining to mirrors of the volume. State flags and their meanings are: One of the mirrors was detached by an I/O failure One of the mirrors needs recovery, but the recovery is related to an administrative operation, not an I/O failure Neither kdetach nor stale is appropriate for the volume. Displays information about each task started by volrecover. For recovery operations (as opposed to start operations), a completion status is printed when each task completes. Displays commands that volrecover would execute without actually executing them. Lim- its operation of the command to the given disk group, as specified by disk group ID or disk group name. If no volume or medianame operands are given, all disks in this disk group will be recovered; otherwise, the volume and medianame operands will be evaluated relative to the given disk group. Without the -g option, if no operands are given, all volumes in all imported disk groups will be recovered; otherwise, the disk group for each medianame operand will be determined based on name uniqueness within all disk groups. Passes the given option argu- ments to the -o options for the volplex att and volume start operations generated by volrecover. An option argument of the form pre- fix:options can be specified to restrict the set of commands that the -o option should be applied to. Defined prefixes are: Applies to all invocations of the volume utility (volume starts, mirror resynchronizations, RAID5 partity rebuilds, and RAID5 subdisk recoveries) Applies to all invocations of the volplex utility (currently used only for attaching plexes) Applies specifically to plex attach operations applies specifically to volume start operations Applies to subdisk recoveries Applies to mirror resynchronization and RAID5 parity recovery DESCRIPTION
The volrecover program performs plex attach, RAID5 subdisk recovery, and resynchronize operations for the named volumes, or for volumes residing on the named disks (medianame). If no medianame or volume operands are specified, the operation applies to all volumes (or to all volumes in the specified disk group). If -s is specified, disabled volumes will be started. With -s and -n, volumes are started, but no other recovery takes place. Recovery operations will be started in an order that prevents two concurrent operations from involving the same disk. Operations that involve unrelated disks will run in parallel. EXAMPLES
To recover, in the background, any detached subdisks or plexes that resulted from replacement of a specified disk, use the command: # volrecover -b medianame If you want to monitor the operations, use the command: # volrecover -v medianame SEE ALSO
volintro(8), volplex(8), volume(8) volrecover(8)

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