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  meta-
     device2

     /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 con-
     tains a mounted file system, you would first need to unmount
     the file system.

     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 sub-
     mirrors, 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 dev-
     ice.

     When used to mirror an existing stripe  or  concatenatation,
     you must stop access to the device. For example, if the dev-
     ice 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 meta-
     devices 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 dev-
     ice 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 administrative 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  metadev-
         ice2.



     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 meta-
     device 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  attri-
     butes:

     ____________________________________________________________
    |       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.  Exist-
     ing  trans  devices are not logging--they pass data directly
     through to the underlying device. See mount_ufs(1M) for more
     information about UFS logging.