Migrate VMs from 3PAR to Netapp FAS

What is the best practice to do a SAN to SAN VM data migration using Storage Vmotion ?

Details

- Current setup is (23) ESX 4.1 hosts with FC datastores on 3PAR storage.
- Booting from SAN
- Bought a new Netapp FAS array and need to move all the VMs over to the FAS array, boot from FAS array. Total 23 TB of data to be moved.
- Decommission 3PAR array after migration

Questions

-  What are the steps involved in the right order ?
- Any caveats in using Storage VMotion after carving and presenting LUNs from new Netapp array to all the hosts ?
- How many storage vmotion migrations can we do per day ?
- How does boot from SAN affect this migration and what is the best way to make the ESX boot from new SAN, I'm guessing downtime is imminent ?

This is the first time we are doing this. Any one has ideas ?
verman09Asked:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Some steps - -
What are the steps involved in the right order ?

0. Check a non critical service or server first.

1. Make sure no VMs have snapshots attached.

2. Preferably do this out of your core hours, or when the servers are "less active", because of the snapshot which is created stores the "delta" active data, it gets written back on the merge, heavy transaction servers, can barf, e.g. Exchange at the Snapshot Merge (at the end of Storage vMotion).

3. I would complete 1 or 2 concurrently.

4. Disable any Backups that are scheduled to run.

5. Disable DRS, you do not want them vMotioning around whilst doing this.

- Any caveats in using Storage VMotion after carving and presenting LUNs from new Netapp array to all the hosts ?
- Check it works, if iSCSI check multipath. Install NetApp plugins to help you later.

- How many storage vmotion migrations can we do per day ?

As many as you like, depends how fast the data is going to move, I would recommend 2 concurrent.

How does boot from SAN affect this migration and what is the best way to make the ESX boot from new SAN, I'm guessing downtime is imminent ?

It does not affect Storage vMotion.

Do you really want to boot ESX from the new SAN? it's rather old and outdated?

Install ESXi on USB flash drive or SD cards....


Here is the VMware KB on installing 5.0 on USB/SD:
http://kb.vmware.com/kb/2004784

We do not install; boot from SAN anymore, waste of valuable SAN space, for ESXi. and we've been doing USB/SD card installs since 2004
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verman09Author Commented:
Thanks, appreciate it. The ESX server HW is not being refreshed yet, so we may have to maintain boot from SAN. In that case, what are the steps to move the ESX OS form 3PAR boot luns to Netapp ?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
You would need to re-install ESXi OS onto the new NetApp LUNs, like any OS which is installed to a LUN.
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