Storage vMotion vs SAN Replication
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Duncan Epping at Yellow Bricks yesterday posted a brief but very interesting article about the best approach to pursue when a company is about to replace its SAN arrays: Storage vMotion or SAN Replication.
Epping breaks down the pros and cons of both approaches:
SAN Replication
- Can utilize Array based copy mechanisms for fast replication (+)
- Per LUN migration, high level of concurrency (+)
- Old volumes still available (+)
- Need to resignature or mount the volume again (-)
- A resignature also means you will need to reregister the VM! (-)
- Downtime for the VM during the cut over (-)
Storage vMotion
- No downtime for your VMs (+)
- Fast Storage vMotion when your Array supports vStorage APIs for Array Integration (VAAI) (+)
- If your Array doesn’t support VAAI migrations can be slow (-)
- Induced cost if VAAI isn’t supported (-)
- Only intra Array not across arrays (-)
- No resignaturing or re-registering needed (+)
- Per VM migration (-)
- Limited concurrency (2 per host, 8 per VMFS volume) (-)
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