Hello,
I've recently joined this list, primarily because of a thread I found from late
April ("Is file cloning anywhere on ZFS roadmap") asking about file-level
cloning in ZFS. Based on that thread I understand that it's not currently
possible to 'clone' files instead of 'copying' them, but the thread didn't
answer the original question about whether this was a reasonable feature or one
being considered for future development.
My limited understanding of how ZFS actually stores data makes me think a
'clone' vs. a 'copy' would be very easy since we have deduplication now - some
new file/filesystem metadata entries, some manipulation of the deduplication
table and the clone is complete. Is this a gross oversimplification? Would this
be much harder to implement than it seems?
VMware vSphere uses NFSv3 and requires a separate mount for each filesystem. It
also specifies a maximum number of NFS mounts per host (64) and maximum number
of iSCSI LUNs per host (256). In a cluster environment this means the existing
filesystem/zvol cloning techniques would only work well in very specific
configurations.
Thanks,
-Will
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