[sheepdog] [PATCH 0/2] add cache options 'page' and 'unsafe'

MORITA Kazutaka morita.kazutaka at lab.ntt.co.jp
Mon Oct 22 15:00:11 CEST 2012

At Mon, 22 Oct 2012 20:35:05 +0800,
迪八哥 wrote:
> From a user's view,I have totally confused about how many kinks of caches are there in sheepdog and how many configurations can be used for cache...

The documentation is available at

> We are exploring Ceph now, and it shows a better performance over sheepdog especially for sequential R/W and random write.I think the Sheepdog and Ceph share a similar internal design(i.e split the image to 4M object, some kinds of consistent-hash has been used).What we think most important is **journal disk** in storage node,Ceph's performance boost up to  3X when an extra 7200rpm sata disk was used for journal.Will sheepdog consider some similar mechanism?

There is no plan for it yet.  But I know that there is much room for
performance improvement, and I'll try any approach for it including
something like journaling.



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