[Gllug] direct io and async io on Openfiler NFS

[Karanbir Singh]

Richard wrote:
> Can anyone tell me if I can simultaneously use direct IO and 
> asynchronous IO between an Openfiler NFS server and a SUSE EL9.2 client 
> (as you might use in a no-cost Oracle 10g cluster). Assuming it's 
> possible, what combination of export and mount options will do the trick?

OpenFiler is actually based on EL3 ... SteveD's comment #6 on 
bugzilla#161362 quite clearly states the level of play w.r.t EL3 and 
AsyncIO/NFS

> I don't think I can boil this down further, nor add much more context 
> beyond the Oracle 10g bit. I can see that there appears to be an open 
> bug against RHEL ( 
> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=161362 unless I'm 
> misreading bugzilla) on this very topic. Simultaneously, I see NetApp 
> claiming support (and offering kernel patches) for this very issue. I 
> can't make sense of it any more. Can someone show me the way?

This bugzilla and potential fix patch, are for EL4 ...

I had a quick look at that bugzilla and tracked the sources down. The 
Patch does indeed interfere with a NFS bugfix patch included in the 
kernel package.

And... fwiw, there is a new OpenFiler 2.0Beta  ( which is EL4 based ) 
release due early next week, one option would be to wait for that, 
install it - rebuild the -22.EL kernel with the fix-patch and see if you 
can live without one ( or more ) of these fix's :

- nfs: Retry lookups after ESTALES (Steve Dickson) [164173]
- kNFSD: fixed '-p port' arg to rpc.nfsd and enables the defining prot 
(Steve Dickson) [154533]
- fix "nfs bindresvport: Address already in use" messages for mounting 
(Steve Dickson) [141773]
- nfs: intr flag prevents core dump (Steve Dickson)
- nfsd: make sure getxattr inode op is non-NULL before calling it.
- nfsd4: nfsd oopsed when encountering a conflict with a local lock
- nfsd4: fix putrootfh return
- nfsd: Insecure port warning shows decimal IPv4 address
- fix nfs-vs-selinux issue

OR, you could always just roll your sleves up and get into some code 
trawling if you understand nfs code ( I, for one, dont )!!!

Lastly, pester SteveD and/or ChuckL for a proper fix.

- K
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