Re:[Xen-users] Which distributed file system for xen hosts/guests?

["John Fairbairn" <webmaster@xxxxxxxxxxxx>]

Ive been using eNBD with raid1 over tcp/ip and COW. I think this would be
a viable solution for you since its fast, has raid, is COW, automatically
embeds a code into the client kernels for antispoofing with no extra work,
and is a block device(so clients dont see where it comes from). The High
availability 'virtual' web cluster I've built is IP_VS(ipvsadm),
heartbeat, and eNBD. It's been working well thus far. I guess the nicest
thing about the system I set up is that I used things that are already
available in the 2.6.x kernels with no patching. You may have to recompile
you dom0 and domU for some of the features(enabling NBD, IP_VS, and COW)
but thats still far easier than trying to mix xen patches and other
patches IMO. Here's a link to eNBD if you feel like checking it out
http://www.it.uc3m.es/~ptb/nbd/ and heres IP_VS(ipvsadm)
http://www.linuxvirtualserver.org/software/ipvs.html and heartbeat
http://www.linux-ha.org/HeartbeatProgram

Hope this Helps ya some.

John Fairbairn


> Maybe this is the wrong place to ask, but since it is related to the
> overall multi-machine architecture, here goes:
>
> What would you folks look at as far as a distributed file systems for
> various physical/virtual Xen machines? Requirements are:
>
> 1. fault tolerant
> 2. relatively speedy
> 3. actively supported/used
> 4. production stability
> 5. ability to add/remove/resize storage online
> 6. clients are unaware of physical file location(s)
> 7. Local client caching for speed over slower network links
> 8. I suppose the file system would sit on something like raid 5 for
> physical protection.
> 9. At a high-level, I'd like to be able to dedicate individual "private"
> file systems to machines as well as have various "public" filesystems, all
> with the same name space.
> 10. Oh yeah -- secure
>
> I've looked at:
>
> 1. GFS -- I want something a bit more
> 2. AFS -- looks great, but it appears to support files up to 2GB? Not big
> enough. Active community though and was/is a commercial product.
> 3. NFS -- please
> 4. Lustre -- looks promising but complex and not completely open source.
> 5. OCFS2 -- Oracle site says beta code, not production ready. Maybe soon?
> 6. Intermezzo -- doesn't look like an active project any more
> 7. Coda -- same
>
> Anything I'm missing? Too much fun...
>
>
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>


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