Using mirroring to migrate data

Mirroring is an LVM task that you perform only on logical volumes to migrate data. The following example shows how to create a mirror copy of a logical volume using the mklvcopy command:

 
# mklvcopy -e m -s y -k datalv 2 hdisk3 hdisk7
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# splitlvcopy -y splitlv datalv 1 

The mklvcopy command options specify the following values:

(-e m)

To use minimum inter-disk allocation policy

(-s y)

To strictly allocate mirror copies on separate physical volumes

(-k)

To synchronize new copies immediately

datalv

The name of the logical volume where you want to start a mirroring operation

2

The number of copies that you want to make of the data (a maximum of 3)

hdisk3 and hdisk7

The physical volumes where the logical volume resides

hdisk3

The physical volume that already holds the data of datalv

hdisk7

The physical volume that will hold the mirror copy and where you want to move the data

The second example is similar to example 1. The mklvcopy command starts mirroring the infxlv logical volume.

# mklvcopy -e m -s y -k infxlv 2 hdisk4 hdisk10
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# rmlvcopy infxlv 1 hdisk4 

In this example, hdisk4 is where the data for infxlv already exists, and hdisk10 is where the mirror copy resides. It is also where you want to ultimately move the data.