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Re: [Xen-devel] [xs-devel] blktap3 / tapdisk3 development

Il 02/10/2014 10:41, Thanos Makatos ha scritto:
It seems upcoming XenServer 6.5 "Creedence" is going to use blktap3 /
tapdisk3 after all, so if i understand this correctly blktap3 is being developed
"only for XenServer", right?
Correct, although it shouldn't be too much work for making it work on upstream 

Many interested persons have been asking on mailing lists and on IRC about
the status of blktap3 development.
Is it possible for someone from Citrix/XenServer to comment about this?

I know there's a blog post about blktap3/tapdisk3 performance
(improvements) here:

One of the interested developers is CC'd on this email. He has written
RBD/Ceph support patch for blktap2, and he's interested in porting that to

Also is this the correct repo with latest blktap3/tapdisk3 bits in it?:
blktap3 is actively developed and is the I/O default data path in XenServer 6.5. The repo you 
mention is the right one (https://github.com/xapi-project/blktap, git branch "xs64bit", 
but we'll soon bring the "master" branch up to date. I'd be more than happy to assist you 
and the developer in porting that patch to blktap3!

Sorry for a my probably stupid question.
Why not use qdisk (that have very good performance, support many formats and is supported also by other project) and improve it if needed instead do/maintain another project xen-only?
FWIK the only thing in what blktab is better is vhd support (not vhdx).

Thanks for any reply and sorry for my bad english.


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