metarename(1M)						  System Administration Commands					    metarename(1M)

NAME

       metarename - rename metadevice or switch layered metadevice names

SYNOPSIS

       /usr/sbin/metarename [-s setname] metadevice1 metadevice2

       /usr/sbin/metarename [-s setname] [-f] -x metadevice1 metadevice2

       /usr/sbin/metarename -h

DESCRIPTION

       There  are two ways to use metarename, one with and one without the -x option. The first method (without -x) renames an existing metadevice
       to a new name. This makes managing the metadevice namespace easier. The metadevice being renamed cannot be mounted or open, nor can the new
       name  already exist. For example, to rename a metadevice that contains a mounted file system, you would first need to unmount the file sys-
       tem.

       With the second way to use metarename, using the -x option, metarename switches (exchanges) the names of an existing layered metadevice and
       one  of	its  subdevices. In Solaris Volume Manager terms, a layered metadevice can be either a mirror or a trans metadevice. The -x option
       enables you to switch the metadevice names of a mirror and one of its submirrors, or a trans metadevice and its master device.

       metarename -x makes it easier to mirror or unmirror an existing stripe or concatenation, and to remove a trans device.

       When used to mirror an existing stripe or concatenatation, you must stop access to the device.  For  example,  if  the  device  contains  a
       mounted file system, you must first unmount the file system before doing the rename.

       You  can  also use the metarename -x command to untrans a trans metadevice from an existing device. This applies only to the master device.
       You cannot remove a logging device with metarename. Before you can rename a trans device, you must detach the logging device. Then you must
       stop access to the trans metadevice itself.

       You  cannot  rename  or switch metadevices that are in an error state or that have subcomponents in an error state, or metadevices actively
       using a hot spare replacement.

       You can only switch metadevices that have a direct child/parent relationship. You could not, for example, directly exchange a stripe  in  a
       mirror that is a master device with the trans metadevice.

       You must use the -f flag when switching members of a trans metadevice.

       Only metadevices can be switched, not slices.

OPTIONS

       The following options are supported:

       -f

	   Force the switching of trans metadevice members.

       -h

	   Display a help message.

       -s setname

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

       -x

	   Exchange the metadevice names metadevice1 and metadevice2.

       metadevice1

	   Specifies the metadevice to be renamed or switched.

       metadevice2

	   Specifies the target metadevice name for the rename or switch operation.

EXAMPLES

       Example 1: Renaming a Metadevice

       This example renames a metadevice named d10 to d100. Note that d100 must not exist for the rename to succeed.

       # metarename d10 d100

       Example 2: Creating a Two-Way Mirror

       This example creates a two-way mirror from an existing stripe named d1 with a mounted file system, /home2.

       # metainit d2 1 1 c13d0s1
       # metainit -f d20 -m d1
       # umount /home2
       # metarename -x d20 d1
       # metattach d1 d2
       # mount /home2

       First, a second concatenation d2, is created. (d1 already exists.) The metainit command creates a one-way mirror, d20, from d1.	Next,  you
       umount  the  file  system  and switch d1 for d20, making d1 the top-level device (mirror). You attach the second submirror, d2, to create a
       two-way mirror. Lastly, you remount the file system.

       Example 3: Mounting a Mirrored File System on Stripe

	This example takes an existing mirror named d1 with a mounted file system, and ends up with the file system mounted on a stripe d1.

       # umount /fs2
       # metarename -x d1 d20
       # metadetach d20 d1
       # metaclear -r d20
       # mount /fs2

       First, you unmount the file system, then switch the mirror d1 and its submirror d20. This makes the mirror into d20. Next,  you	detach	d1
       from d20, then delete the mirror d20 and its other submirror. You then remount the file system.

       Example 4: Deleting a Trans Metadevice

       This  example deletes a trans metadevice named d10 while its mount point is /myhome. The master device, which is a stripe, is named d2. The
       logging device, also a stripe, is named d5.

       # umount /myhome
       # metadetach d10
       # metarename -f -x d10 d2
       # metaclear d2
       # metaclear d5
       # fsck /dev/md/dsk/d10
       # mount /myhome

       You umount the file system first, then detach the trans metadevice's logging device. The trans  metadevice  is  switched  with  the  master
       device, making the trans metadevice d2 and the underlying stripe d10. You clear the trans metadevice d2 and the logging device d5. d10 must
       be fsck'd, and then the file system is remounted.

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			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mdmonitord(1M), metaclear(1M),  metadb(1M),  metadetach(1M),  metahs(1M),  metainit(1M),  metaoffline(1M),  metaonline(1M),  metaparam(1M),
       metarecover(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)

       Solaris Volume Manager Administration Guide

LIMITATIONS

       Renaming and exchanging metadevice names can only be used for metadevices. A physical slice cannot be renamed to a metadevice,  nor  can  a
       metadevice be exchanged with a physical slice name.

       Metadevice names are strings of the pattern  d<xyz> where xyz is a value between 0 and 8192. You cannot use logical names for metadevices.

NOTES

       Trans  metadevices have been replaced by UFS logging. Existing trans devices are not logging--they pass data directly through to the under-
       lying device. See mount_ufs(1M) for more information about UFS logging.

SunOS 5.10							    8 Aug 2003							    metarename(1M)