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Commands Reference, Volume 1
Marks or unmarks mirror copy as a split mirror.
chlvcopy [ -f ] {
-B [ -s ] } | { -b [ -c
copy ] [ -f ] [
-P ] [ -l newlvname ] [ -w ] } LV
name
Notes:
- To use this command, you must either have root user authority or be a
member of the system group.
- If persistence is used either by using the -P flag or by
creating a child backup logical volume device by using the -l flag,
it will cause the volume group to be usable only on AIX 4.3.2 or
later. This is true even after removal of split mirror copy designation
of the parent logical volume and the child backup logical volumes.
- For chlvcopy to be successful in a concurrent volume group
environment, all the concurrent nodes must be at AIX 4.3.2 or
later.
All partitions of a logical
volume must be fresh before chlvcopy can mark a mirror copy as a
split mirror. Only one copy may be designated as an online split mirror
copy.
Although the chlvcopy command can mark online split mirror
copies on logical volumes that are open (including logical volumes containing
mounted file systems), this is not recommended unless the application is at a
known state at the time the copy is marked as a split mirror. The split
mirror copy is internally consistent at the time the chlvcopy
command is run, but consistency is lost between the logical volume and the
split mirror copy if the logical volume is accessed by multiple processes
simultaneously and the application is not at a known state. When
marking an open logical volume, data may be lost or corrupted. Logical
volumes should be closed before marking online split mirror copies in order to
avoid a potential corruption window.
If the persistence flag is not set to prevent the loss of backup data, the
volume group should be set to not automatically varyon and the -n
flag should be used with varyonvg to prevent stale partitions from
being resynced. If the persistence flag (-P) is set, the
following applies: In the event of a crash while an online split mirror
copy exists (or multiples exist), the existence of copies is retained when the
system is rebooted.
| -b
| Marks a mirror copy as a split mirror copy.
|
| -c copy
| Mirror copy to mark as split mirror copy. The allowed values of
copy are 1, 2, or 3. If this option is not specified the default for
copy is the last mirror copy of the logical volume.
|
| -B
| Unmarks a mirror as split mirror copy. It will also attempt to
remove the child backup logical volume, if one was created with the
-l option.
|
| -f
| Forces split mirror copy even if there are stale partitions. If
used with the -B option, the child backup logical volume if one was
created with the -l option, will be removed with the
force option.
|
| -l newlvname
| New name of the backup logical volume. Specifying the
-l flag also sets the persistence option, allowing applications to
access split mirror copy via newlvname.
|
| -P
| Maintains information about the existence of an online split mirror copy
across a reboot and also allows other nodes (in a concurrent mode environment)
to be aware of the existence of the online split mirror copy.
|
| -s
| Starts a background syncvg for the logical volume.
|
| -w
| Allows split mirror copy to be writable (default is to create the split
mirror copy as READ ONLY).
|
| LV name
| Logical volume to act on.
|
The readlvcopy and chfs commands.
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