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Compression and vSphere drive mapping.

We are planning on purchasing a NAS to map our non-critical SQL Server drives to, so we can free up our costly production SSDs on our SAN. We currently use Oracle ZFS shares between vSphere and our SAN disks. Its all NFS. The compression is like 300gb on the SAN is 1tb of usable space for the VMs. So a question about the way we want to go about this with mapping drives to SAN project- Do we want to do the mapping straight from the VM drive to the SAN, or do we want to setup another NFS share that does the compression and such for these particular drives that go to the NAS in order to get more out of the space we would have on the SAN? Is the "best practice" in this case to just map direct or to do another NFS share with compression to the cheaper drives on the NAS?
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new_to_networksAuthor Commented:
Let clarify that a bit more- what my question is, is, when attaching the NAS space in vSphere- does the compression still take place in the same way it does on the SAN, or is it 1 to 1 from the VMs to the NAS? Is it done in another NFS share or are these mapped drives done in a different way that have nothing to do with shares and compression?
Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Setup another NFS share, unless you want to use RDM and iSCSI, and create RAW RDMs.

What VMs will you be using?
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