metareplace(1M) 					  System Administration Commands					   metareplace(1M)

NAME

       metareplace - enable or replace components of submirrors or RAID5 metadevices

SYNOPSIS

       /usr/sbin/metareplace -h

       /usr/sbin/metareplace [-s setname] -e mirror component

       /usr/sbin/metareplace [-s setname] mirror component-old component-new

       /usr/sbin/metareplace [-s setname] -e RAID component

       /usr/sbin/metareplace [-s setname] [-f] RAID component-old component-new

DESCRIPTION

       The metareplace command is used to enable or replace components (slices) within a submirror or a RAID5 metadevice.

       When  you  replace  a  component, the metareplace command automatically starts resyncing the new component with the rest of the metadevice.
       When the resync completes, the replaced component becomes readable and writable. If the failed component has been hot spare  replaced,  the
       hot spare is placed in the available state and made available for other hot spare replacements.

       Note that the new component must be large enough to replace the old component.

       A  component  may  be  in one of several states. The Last Erred and the Maintenance states require action. Always replace components in the
       Maintenance state first, followed by a resync and validation of data. After components requiring  maintenance  are  fixed,  validated,  and
       resynced, components in the Last Erred state should be replaced. To avoid data loss, it is always best to back up all data before replacing
       Last Erred devices.

OPTIONS

       Root privileges are required for all of the following options except -h.

       -e		Transitions the state of component to the available state and resyncs the failed component. If the  failed  component  has
			been  hot  spare  replaced, the hot spare is placed in the available state and made available for other hot spare replace-
			ments. This command is useful when a component fails due to human error (for example, accidentally turning off a disk), or
			because  the  component  was physically replaced. In this case, the replacement component must be partitioned to match the
			disk being replaced before running the metareplace command.

       -f		Forces the replacement of an errored component of a metadevice in which multiple components are in  error.  The  component
			determined  by	the metastat display to be in the ``Maintenance'' state must be replaced first. This option may cause data
			to be fabricated since multiple components are in error.

       -h		Display help message.

       -s setname	Specifies the name of the diskset on which metareplace will work. Using the -s option will cause the  command  to  perform
			its  administrative  function  within the specified diskset. Without this option, the command will perform its function on
			local metadevices.

       mirror		The metadevice name of the mirror.

       component	The logical name for the physical slice (partition) on a disk drive, such as /dev/dsk/c0t0d0s2.

       component-old	The physical slice that is being replaced.

       component-new	The physical slice that is replacing component-old.

       RAID		The metadevice name of the RAID5 device.

EXAMPLES

       Example 1 Recovering from Error Condition in RAID5 Metadevice

       This example shows how to recover when a single component in a RAID5 metadevice is errored.

	 # metareplace d10 c3t0d0s2 c5t0d0s2

       In this example, a RAID5 metadevice d10 has an errored component, c3t0d0s2, replaced by a new component, c5t0d0s2.

       Example 2 Use of -e After Physical Disk Replacement

       This example shows the use of the -e option after a physical disk in a submirror (a submirror of mirror mymirror1, in this case)  has  been
       replaced.

	 # metareplace -e mymirror1 c1t4d0s2

       Note: The replacement disk must be partitioned to match the disk it is replacing before running the metareplace command.

EXIT STATUS

       The following exit values are returned:

       0     Successful completion.

       >0    An error occurred.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWmdu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Stable			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mdmonitord(1M),	metaclear(1M),	metadb(1M),  metadetach(1M),  metahs(1M),  metainit(1M),  metaoffline(1M),  metaonline(1M), metaparam(1M),
       metarecover(1M), metarename(1M), metaroot(1M), metaset(1M), metassist(1M), metastat(1M), metasync(1M), metattach(1M), md.tab(4),  md.cf(4),
       mddb.cf(4), md.tab(4), attributes(5), md(7D)

SunOS 5.11							    26 Mar 2006 						   metareplace(1M)