How long to convert LVM to VxVM

[Mohamed Amine]

Hi all,

We need to convert a VG of 38 PV and 500 GB of data to VxVM in order to set up a CFS Cluster.
As the operation requires a downtime, we need to evaluate the time the conversion would take. Does anyone have a clue about how to guesstimate it ?

Thanks for your help.

[TTr]

How are you planning to do this? The long way (save data, create diskgroups, restore data)? That can take a while. The backup and restore of the 500GB should take the least time if you have an enterprise backup system. Manually creating volumes with 38 disks can take a while.

Alternatively you can look in to the vxvmconvert utility. Search on the HP site for the "Veritas volume manager migration guide hp-ux". The VXVM 3.5 version is here
http://www.docs.hp.com/en/5187-1372/index.html

[Steven E. Protter]

Shalom,

I would suggest scripting as much of this as possible.

doing it in a test environment and using the keyboard logs, or creative use of awk could be a real time saver.

CFS Cluster requires vxVM?

I like LVM better and would not do this conversion unless forced.

SEP

[Mohamed Amine]

Hi,

Thanks for you answer.

I plan to use vxvmconvert, and this is the point : does it take a long time to convert from LVM to VxVM ?

CFS does require VxVM to my knowledge, does it not !? It is from Veritas.

Thanks.

[Pete Randall]

If possible, I would suggest setting up a couple of test runs for timing purposes. If you could allocate a 1GB and a 10GB LVM scenario, then run both through vxvmconvert. Assuming the 10GB convert takes 10 times longer than the 1GB, the math for 500GB becomes pretty simple.


Pete