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Commands Reference, Volume 1
chlvcopy Command
Purpose
Marks or unmarks mirror copy as a split mirror.
chlvcopy [ -f ]
{ -B
[ -s ] } |
{ -b
[ -c copy ]
[ -f ] [ -P ]
[ -l newlvname ]
[ -w ] }
LV name
Description
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 4.3.2.0 or later versions of AIX.
This is true even after removal of split mirror copy designation of the parent
logical volume and the child backup logical volumes.
- For chvlcopy to be successful in a concurrent volume group
environment, all the concurrent nodes must be at AIX Version 4.3.2 or later.
All
partitions of a logical volume must be freshed before chvlcopy 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.
Flags
-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. |
Related Information
The readlvcopy
and chfs commands.
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