Mirror Break

[Joyce Suganthy]

Hi All,

Could someone help me here,
I have two disk mirrrored and I would like to break the mirror.

Please help me with the steps.

Thanks in advance

Joyce

[Norman_21 · Accepted solution]

Hi,
# lvreduce -m 0 /dev/vg00/lvol1 /dev/dsk/
will break the mirror. repeat the same with all lvs.

Also, here is a good step by step thread:

http://forums.itrc.hp.com/cm/QuestionAnswer/1,,0x6967c1c4ceddd61190050090279cd0f9,00.html

Thanks.

[Norman_21]

add to your notes to make a recovery tape backup before proceeding.

Thanks.

[T G Manikandan]

First do a
vgdisplay -v /dev/vg00

Note down the volumes you are trying to break the mirror.
Then just do a

#lvreduce -m 0 /dev/vg00/lvol1 /dev/dsk/cXtYdZ

Here cXtYdZ is the mirror disk
Here above will remove the mirror of lvol1.

Likewise remove the volumes which need mirror break.

After doing that you can remove the mirror drive (that was just un-mirrored) using

#vgreduce /dev/vg00 /dev/dsk/cXtYdZ

Thanks

[Jakes Louw_1]

Use LVSPLIT to split the mirror with the option to merge them again later:

lvsplit -s m lv_path

This will create an LVOL with a suffix of "m" attached to the original LVOL name. You can then use LVMERGE to merge them again later, but NOTE!!! the manpage entry for LVMERGE, especially the destination and source paths....

lvchange -m 0 simply throws the mirror away.