Originally posted by: gangister

We are trying to do a migration from one storage to another. We have tries cplv and mirrorvg. We are getting 50MB/s and its actually slow. One of the storage has 400MBps capacity and the other 1000MBps, and they are not even with load now. We suppose AIX might be slowing the transfer rate. What alternate method could we use or how could we speed up the mirrorvg or other command?

Originally posted by: j.gann

mirrorvg -s

syncvg -P 8 or -P 16

enjoy

jg

Originally posted by: gangister

The test went good, the speed went up to 650MB/s!

Thanks for the tip.

When the mirror finished, we run a lsvg -l and some hdisks apperared missing.

Then a unmirrorvg was run with the followin result: The unmirror of the volume group failed.
        The volume group is still partially or fully mirrored.

Then we run a lspath and the paths were shown as missing too.

Why could this be? The syncvg doesnt fully sync the VGs?

Originally posted by: gangister

Just for the record. The problem we had initially (the unmirror failing) was due to a disconnection of one of the arrays that became full.

Later we tried the process again and we reached 900MB/s! Almost 3TB per hour.

We used mirrorvg - s and syncvg -P 32, faster than sound. Thanks j.gann for the tip!

Originally posted by: gangister

When syncvg is running, will it be syncing forever? Or it will just sync until the moment then the sync command was run?

The syncvg can be run with the application working? or it has to be down?

Originally posted by: aschauhan

if offline migration can be performed then you can use thin copy at storage level. on host level mirrorvg -m <vg name> <pv Names>  is the good option,