[zfs-discuss] ...couple of issues/misunderstandings, hoping for clarification...
chessdoter at googlemail.com
Tue Apr 10 08:51:31 EDT 2012
while augmenting my use of the lovely zfs filesystem,i few questions/
- what does the snapshot.property "compression" mean? Isnt this really
a filesystem property? What is it for?
- when i moved a volume (zfs create -V...) around by means of the
rename sub-comand, i found: neither the link at /dev/zvol nor the one
at /dev/<poolname>/<volpath> got updated. I was able to work around
this one by exporting and reimporting the pool.
- after taking a snapshot from a volume, the used size for the volume
immediately doubles (1x volume + 1x per snapshot). This does not take
into consideration, how many changes - if any - are made to the
volume. Is this just a miscalculation or doesnt zfs use COW at the
block level only (as would some dedup-algorithm do)? That was
confusing and unexpected!
- After creating a pool with dev/disk/by-id names, exporting it and
reimporting, the names were replaced by names like sdb1. So what is
the benefit from finding the by-id names in the first place? I was
expecting those names to stay to avoid issues due to renaming of
devices depending on the connecting sequence or caused by connecting
different external drives to the same port.
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