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 redun‐
dancy is lost while one submirror is offline.) The metaoffline command
differs from the metadetach command because it does not sever the logi‐
cal 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 different
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 vol‐
umes 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 requir‐
ing 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 func‐
tion within the specified diskset. Without this
option, the command will perform its function 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, d9, offline from mirror d10.
# metaoffline d10 d9
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 ALSOmdmonitord(1M), metaclear(1M), metadb(1M), metadetach(1M), metahs(1M),
metainit(1M), metaparam(1M), metarecover(1M), metarename(1M), metare‐
place(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
NOTES
The metaonline and metaoffline commands are not applicable to mirrors
in application-based recovery (ABR) mode.
SunOS 5.10 12 Apr 2004 metaoffline(1M)
