Re: [Xen-devel] iscsi patch

[Brian Wolfe <brianw@xxxxxxxxxxxx>]

Yep. It also exists in 2.6.7, 2.6.6, etc. I've always found NFS-root to
be an undesireable position to be in for any kind of production setup.
NFS just isn't solid enough to handle temporary fileserver failures
IMHO. 8-( I used it because I really didn't have any alternatives for
being able to move a XenLinux image between various servers cleanly.

You are right below in that I don't mean nfs server. I'm trying to get
away from NFS completely. It's a hack of a network based filesystem
IMHO. Even NFS4 doesn't solve half of the issues. 8-( NFS5 sounds
promising, but yet again, it's still hacks IMHO. I believe that for a
root filesystem you REALLY do want block level interfaces like iSCSI,
FC, and other SANs for production systems. Anything less is playing
russian roulette with your server IMO.

On Wed, 2004-08-25 at 12:40, Ian Pratt wrote:
> > Well crudpuppies...  8-P I guess I'll have to fall back to a 2.4 kernel
> > for now and hope all of the evms features that I'm using on 2.6.8 work
> > in 2.4.x. *sigh* NFS root is just too darn unstable to run any XenLinux
> > kernels from. 
> 
> You know that 2.6.8 has a horrible NFS bug which is why 2.6.8.1
> got released, right?
> 
> I've certainly never found NFS root to work very satisfactorily
> under any version of Linux I've tried -- it's quite easy to get
> the thing to deadlock in low memory situations.
> 
> That's why I switched to using iSCSI, which with the Cisco
> initiator actually seems pretty stable, at least for me.
> 
> > Just to give you an idea of what I'm trying to acomplish here...
> > 
> > a pair of raid-5 servers would provide evms volumes to the iSCSI target
> > drivers. Eaxh Xen node machine would mount a iSCSI target from each nfs
> > server in a raid-mirror block device and export it as a xen block device
> > to the XenLinux image to run from.
> 
> You don't really mean 'nfs server' in the above do you? I can't
> see where NFS comes into the setup you're describing.
> 
> Ian



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