How to estimate storage vmotion migration time?

[andresousa]

Hello.

I have to plan a migration of virtual machines between two storage systems. Both are using 4Gb SAN (HBAs, switches and storage ports) and a misc of SAS/SATA drives. My question is what is the best way to estimate the transfer rate? I know it depends on storage performance, but does have a approximated formule? If no, what are your experience?

Thanks,

André

[mcowger]

(Size of VMDKs) / (test MB/s rate on test VM)

Its so variable based on host load, VMDK size, VAAI offloads, RAID levels, etc that the above is the best you are gonna get.

[andresousa]

Do you have some real rates in SAN environments?

Thanks,

André

[mcowger]

I've seen 100MB/s on a slower system and 1600MB/sec on a very fast one.

[andresousa]

Thanks, Matt.