Software RAID issues (was Re: Suggestions solicited, server bring up)
Bill McGonigle
bill at bfccomputing.com
Wed Nov 25 01:25:24 EST 2009
On 11/24/2009 05:36 PM, Alan Johnson wrote:
> Nice! Ok, so you get the multi-level, compression, encryption, error
> checking, and RAIDZs? Anything else significant I am forgetting?
coming soon to a ZFS near you: block-level de-duplication. If a block
with the same SHA-256 exists on disk it gets pointer counted (optional,
there's a chance of collisions before the heat death of the universe -
there's also a verify mode for the truly paranoid).
> Can ZFS take an iSCSI block device as a pool member? (Did I use pool
> right there? Like and LVM volume group, right?)
yes, right, the iSCSI target would be a vdev in the pool.
> If so, risk of
> infinite recursion asside, that could be a very powerful way to leverage
> a local FusionIO device to buffer an iSCSI storage cloud/SAN.
Sure, and ZFS knows what to do with faster drives (it uses them to cache
stuff from slower drives automagically - well once you tell it to do so).
-Bill
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