Some Quick Questions?

[Mario Di Natale]

1) Is it possible to stack lessfs ontop of btier?

2) Is there a recommended underlying filesystem for lessfs? (xfs/zfs?)
3) Has Leveldb been considered for a key/value backend?

[Mark Ruijter]

Some quick answers.
See inline.

On 04/05/2014 10:21 PM, Mario Di Natale wrote:

1) Is it possible to stack lessfs ontop of btier?

>> Yes that is possible. Just format the btier device with ext4 or xfs, mount and install lessfs as usual.

2) Is there a recommended underlying filesystem for lessfs? (xfs/zfs?)

ZFS does not seem to make sense? Unless you are unhappy with the ZFS built-in dedupe?
Ext4 or XFS will work fine.

3) Has Leveldb been considered for a key/value backend?

http://hackingdistributed.com/2013/11/27/bitcoin-leveldb/
It looks like there are some issues with LevelDB and the way data persistence is coded.

An alternative that I did investigated and looks promising is http://symas.com/mdb/ or Hyperdex.


Mark.

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[Mario Di Natale]

I too was looking at hyperdex, but i was not aware of lmdb...

It looks pretty impressive, not sure what hyperdex would offer over lmdb...

Is this being planned for a near term release or just theoretical thinking at this point?

-m

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[Mark Ruijter]

It is a bit more then theoretical.
I have an almost working port for lmdb, only hardlinks are not (yet) supported.
Porting Lessfs to any type of key/value store is actually not that much work.

Mark.

P.S. Should you be interested in the preliminary code then let me know.
I'll send to the sources.

[Mario DiNatale]

Yes definitely I'd love to take a gander at it... Building my new storage box today, so perhaps I can give you some benchmarks later this week

Sent from my iPhone