We have a PS4000E which is about to take some of our datastores for VMware. What i was wondering is it worth enabling Snapshotting for vmware Volumes on the SAN?
Is it worth using twice the space? Are they used by the vmware Storage APIs?
Thanks for the help.
It depends. I personally don't think (for most use cases) that the space used for these snapshots is justified. In most use cases, one can leverage VMware snapshots or true backup methods to provide the required restore points. If your business/customer requires more options than this approach provides, then the snapshots can be a viable option. Again, for most workloads I will set the snapshot reserve space to 0 and move on.
Yeah, snapshot reserve usage on EQL boxes is huge. EQL uses 16MB block sizes so each time your VM writes to disk (and it will do this 1-3 times/second) you might be writing out a new 16MB block into snap reserve.
Same issues with replication, replication deltas are huge on EQL.