vxrecover(1M)															     vxrecover(1M)

NAME

       vxrecover - perform volume recovery operations

SYNOPSIS

       vxrecover [-bcEmnpsvV] [-d defaults_file] [-g diskgroup] [-o options]
	   [-t tasktag] [volume | volume_set | medianame...]

DESCRIPTION

       The  vxrecover  utility performs plex attach, RAID-5 subdisk recovery, and resynchronize operations for the specified volumes, for all vol-
       umes under the specified volume sets, or for volumes residing on the disks specified by medianame.  If no medianame, volume  or	volume_set
       is  specified,  the  operation applies to all volumes, or to all volumes in the specified disk group.  If -s is specified, disabled volumes
       are started.  With -s and -n, volumes are started, but no other recovery takes place.

       Recovery operations are started in an order that prevents two concurrent operations on the same disk.  Operations  that	involve  unrelated
       disks run in parallel.

OPTIONS

       -b	 Performs  recovery  operations  in the background.  With this option, vxrecover runs in the background to attach stale plexes and
		 subdisks, and to resynchronize mirrored volumes and RAID-5 parity.  If this is used with -s, volumes are started before  recovery
		 begins in the background.

       -c	 Operates  on cluster-sharable disk groups.  This option is used by the cluster reconfiguration utility to effect recovery on vol-
		 umes in shared disk groups after the failure of a node in the cluster.  Do not use -c as a command-line option.   Available  only
		 if the Veritas Volume Manager (VxVM) cluster feature is enabled and a license is installed.

       -d defaults_file
		 Specifies  the  absolute  pathname  of a defaults file to use instead of /etc/default/vxrecover. The defaults file can be used to
		 define new values for the I/O region size and delay time when reattaching plexes. The following attributes may be defined in this
		 file:

		 iosize=size
		      Specifies  the  size  (in  standard length units as defined in vxintro(1M)) of the regions that are used to perform recovery
		      operations.  Specifying a larger size typically causes the operation to complete sooner, but with greater  impact  on  other
		      processes using the volume.  The default I/O size is 2048 sectors (1 megabyte).

		 slow=iodelay
		      Allows  the  impact  on  system performance of copy operations to be reduced.  Plex recovery operations usually consist of a
		      number of short operations on small regions of the volume.  This attribute inserts a delay between the recovery of each such
		      region.  A specific delay is specified as a number of milliseconds.  The default value is 250 milliseconds.

		 The following settings are suggested for a clustered environment with a large number of mirrored volumes:

		   iosize=4m
		   slow=1000

		 corresponding to an I/O size of 4 megabytes, and an I/O delay of 1000 milliseconds.

       -E	 Starts  disabled volumes or plexes even when they are in the EMPTY state.  This is useful for starting up volumes restored by the
		 vxmake utility when specified along with the -s option.

       -g diskgroup
		 Limits operation of the command to the given disk group, as specified by disk group ID or disk group name.  If no volume or medi-
		 aname is specified, all disks in this disk group are recovered, otherwise, the volume and medianame are evaluated relative to the
		 given disk group.

		 Without the -g option, if no volume and medianame is specified, all volumes in all imported disk groups are recovered; otherwise,
		 the disk group for each medianame specified is determined based on name uniqueness within all disk groups.

       -m	 Recognizes and enables volumes that were moved as a result of a disk group move, split or join operation.

       -n	 Does  not  perform  any recovery operations.  If used with -s, volumes are started, but no other actions are taken.  If used with
		 -p, vxrecover only prints a list of startable volumes.

       -o options
		 Passes the given option arguments to the -o options for the vxplex att and vxvol start operations generated  by  vxrecover.   You
		 can specify an option argument in the form

			prefix:options

		 to restrict the set of commands that the -o option is applied to.  Defined prefixes are:

		 o  vol  applies  to  all invocations of the vxvol utility (volume starts, mirror resynchronizations, RAID-5 partity rebuilds, and
		    RAID-5 subdisk recoveries)

		 o  plex, applies to all invocations of the vxplex utility (used only for attaching plexes)

		 o  attach applies specifically to plex attach operations

		 o  start applies specifically to volume start operations

		 o  recover applies to subdisk recoveries

		 o  resync applies to mirror resynchronization and RAID-5 parity recovery.

       -p	 Prints the list of selected volumes that are startable.  For each startable volume, a line is printed containing 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 include:

		 o  kdetach indicates that one of the mirrors was detached by an I/O failure

		 o  stale means that one of the mirrors needs recovery, but that the recovery is related to an administrative  operation,  not	an
		    I/O failure

		 o  stopped prints if neither kdetach nor stale is appropriate for the volume.

       -s	 Starts  disabled  volumes  that  are selected by the operation.  Volumes are started before any other recovery actions are taken.
		 Volumes are started with the -o delayrecover start option.  This requests that any operations that can be delayed in  starting  a
		 volume  are  delayed.	That is, only those operations necessary to make a volume available for use occur.  Other operations, such
		 as mirror resynchronization, attaching of stale plexes and subdisks, and recovery of stale RAID-5 parity, are typically delayed.

       -t tasktag
		 If any tasks are registered to track the progress of the operation, marks them with the tag tasktag.  This option is also  passed
		 to  any  utilities called to perform recoveries, so all tasks registered by any utility to perform the recoveries are also tagged
		 with tasktag.

       -v	 Displays information about each task started by vxrecover.  For recovery operations (as opposed to start  operations),  prints  a
		 completion status when each task completes.

       -V	 Displays  each  command executed by vxrecover.  The ouput generated is more verbose than the job descriptions printed with the -v
		 option.

EXAMPLES

       To recover, in the background, any detached subdisks or plexes that resulted from replacement of a specified disk, use the command:

	      vxrecover -b medianame

       To monitor the operations, use the command:

	      vxrecover -v medianame

FILES

       /etc/default/vxplex Standard defaults file for vxplex that determines whether FastResync is used when attaching plexes.	See vxplex(1M) for
			   details.

       /etc/default/vxrecover
			   Standard defaults file for vxrecover that is used to set the I/O size and I/O delay values for recovery operations.

SEE ALSO

       vxintro(1M), vxmake(1M), vxplex(1M), vxvol(1M), vxvset(1M)

VxVM 5.0.31.1							    24 Mar 2008 						     vxrecover(1M)