This is a follow up to my previous message about raid cards with large flash caches. Some time ago Facebook released flashcache[1] and a friend of mine pointed me at another project, bcache[2] which is aimed at more modern kernels (flashcache works on 2.6.18 and .20, I assume because RHEL5 uses 2.6.18, and that's very likely what facebook uses. It looks like the author of bcache is targeting the upstream linux kernel.)
Now, as far as I can tell, nobody is even trying to get flashcache upstream, and bcache, well, the posts from Overstreet seem to indicate that he's working on it and making good headway, but even if it does get upstreamed, it'll need to be backported to something that supports a Xen Dom0. Of course, switching to a dom0 with ZFS would make this problem just go away; zfs already has good, solid support for this sort of thing. I could also give people storage over the network to zfs capable boxes. I'd have to upgrade and be more careful in general with my network, but it could be done. Anyhow, is anyone else using flashcache and/or bcache? I mean, right now both seem pretty early. Thoughts on the approach? [1]https://github.com/facebook/flashcache/blob/master/doc/flashcache-sa-guide.txt [2]http://bcache.evilpiepirate.org/ -- Luke S. Crawford http://prgmr.com/xen/ - Hosting for the technically adept http://nostarch.com/xen.htm - We don't assume you are stupid. _______________________________________________ Tech mailing list [email protected] https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
