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Re: [Linux-cluster] NFS on GFS architectural issues / problems



Riaan van Niekerk wrote:

Wendy Cheng wrote:

Riaan van Niekerk wrote:


My question to you or anyone who is familiar with NFS on GFS, or GFS in general, which of the following are still valid issues for the current (6.1u4) version of GFS. If all or most of them still apply, I can use this as motivation for my customer to strongly consider going off NFS on GFS. Removing the NFS from our GFS cluster has been on the cards for quite a while, but has not gained momentum due to lack of information on the performance gains of such a move (very difficult to gage) or the architectural problems/limitations of NFS on GFS (for which the following extract is spot-on).



These have been worked on and some of them do have test patches ready to address the issues. However, the changes are non-trivial and may involve base kernel modifiction that we need to get upstream (community linux kernel) acceptance. The efforts take time since we would like to do it conservatively to preserve GFS1/2 stability. Unless the posted problems have urgent needs (let us know), the current NFS-GFS development focus is on failover (Red Hat bugzilla 132823).

Is performance the primary concern you have now ?

-- Wendy


Yes, mostly. We have a couple of open service requests for stability. They are very intermittent and not reproduceable (and nothing in bugzilla seems to match):


All four issues mentioned are still present in RHEL 3/4 and most of them are not GFS specific. As long as it is a cluster filesystem beneath linux's nfsd, these issues exist.

I don't plan to defend for NFS - it has inherited problems by its nature. Moving to GFS natively is good from performance point of view (one layer less). However, I would suggest you do make some efforts to understand the problems before taking any significant changes.

Do you have Red Hat support ticket numbers for the mentioned problems that I can take a look ?

-- Wendy




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