metaoffline(1M) 					  System Administration Commands					   metaoffline(1M)

NAME

       metaoffline, metaonline - place submirrors offline and online

SYNOPSIS

       /usr/sbin/metaoffline -h

       /usr/sbin/metaoffline [-s setname] [-f] mirror submirror

       /usr/sbin/metaonline -h

       /usr/sbin/metaonline [-s setname] mirror submirror

DESCRIPTION

       The  metaoffline  command  prevents Solaris Volume Manager from reading and writing to the submirror that has been taken offline. While the
       submirror is offline, all writes to the mirror will be kept track of (by region) and will be written when the  submirror  is  brought  back
       online.	The  metaoffline command can also be used to perform online backups: one submirror is taken offline and backed up while the mirror
       remains accessible. (However, if this is a two-way mirror, data redundancy is lost while one submirror is offline.) The metaoffline command
       differs	from  the metadetach command because it does not sever the logical association between the submirror and the mirror. To completely
       remove a submirror from a mirror, use the metadetach command.

       A submirror that has been taken offline will only remain offline until the metaonline command is invoked or the system is rebooted.

       When the metaonline command is used, reading from and writing to the submirror resumes. A resync is automatically  invoked  to  resync  the
       regions	written while the submirror was offline. Writes are directed to the submirror during resync. Reads, however, will come from a dif-
       ferent submirror. Once the resync operation completes, reads and writes are performed on that submirror. The  metaonline  command  is  only
       effective on a submirror of a mirror that has been taken offline.

       The metaoffline and metaonline commands can not be used on RAID 1 volumes in application-based recovery (ABR) mode.

       A submirror that has been taken offline with the metaoffline command can only be mounted as read-only.

OPTIONS

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

       -f	     Forces offlining of submirrors that have slices requiring maintenance.

       -h	     Displays usage message.

       -s setname    Specifies	the  name of the diskset on which metaoffline and metaonline 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  func-
		     tion on local metadevices.

       mirror	     Specifies the metadevice name of the mirror from which the submirror will be either taken offline or put online.

       submirror     Specifies the metadevice name of the submirror to be either taken offline or put online.

EXAMPLES

       Example 1 Taking a Submirror Offline

       This example takes one submirror, mymirror_sub1, offline from mirror mymirror.

	 # metaoffline mymirror mymirror_sub1

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),  metaparam(1M),  metarecover(1M), metarename(1M),
       metareplace(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)

NOTES

       The metaonline and metaoffline commands are not applicable to mirrors in application-based recovery (ABR) mode.

SunOS 5.11							    26 Mar 2006 						   metaoffline(1M)