ZFS: raid VS copies=n
c.kworr at gmail.com
Fri Jun 7 16:18:49 UTC 2013
07.06.2013 18:52, Quartz:
> How does the ZFS option 'copies=n' and raid relate to and interact with
> each other? specifically recovery in the event of a failure. For
> example, is having three disks in a raid-1 configuration with copies=1
> effectively the same as having three disks in a raid-0 with copies=3?
> Are the copies distributed uniformly across all drives in the pool, or
> concentrated, or what? What happens with configs like a raid-z2 with
> copies=2? Which / how many disks can you lose?
> (I'm aware that like a lot of other ZFS options copies=n doesn't have to
> be global to the entire pool / directory structure, but for the sake of
> simplicity let's assume it is in this case).
copies=n tries to allocate blocks on different disks but doesn't
guarantee this nor that any single disk can be used to retrieve data.
Sphinx of black quartz, judge my vow.
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