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From Mahesh Paolini-Subramanya <>
Subject Re: Any opinions on an NFS data store?
Date Tue, 11 Nov 2008 21:04:36 GMT
Well, it just so happens that we have a (wicked) fast NFS server in- 
house, which has the added benefit of being fault-tolerant, reliable,  
redundant (and clearly fully buzz-word compliant).
The way I look at it, I'd *love* to use it for this purpose, and if  
flush() is pretty much the only constraint, I doubt that I have an  
Clearly, however, the 'update=false' (or stale='ok', or whatever) will  
be a much bigger problem.

That said, any particular reason that we dont want to have a Read-Only  
I know that in our particular case (processing vast quantities of  
CDRs), i really don't care about the data/indexes being up to date -  
heck accuracy to the nearest hour will do too :-)

Mahesh Paolini-Subramanya
CTO,  Aptela Inc.
(703.386.1500 x9100)

On Nov 11, 2008, at 12:26 PM, ara.t.howard wrote:

> On Nov 11, 2008, at 10:03 AM, Mahesh Paolini-Subramanya wrote:
>> Assuming just one CouchDB server, would having the data store be NFS
>> based even work?
>> What about multiple servers?  I can definitely see chaos emerging
>> from multiple servers building View indexes simultaneously, but what
>> if read-access was done with 'update=false'?
>> What about writes with multiple servers?
>> Just wondering if there are any *immediate* gotchas that I should be
>> aware of (e.g., NFS - Just Say No :-)  )
> it depends *greatly* on what your NFS sever is.  i've run linux-ha
> machines with stonith serving postgresql on top of NFS and it was more
> robust and faster that local disk.  how is that you ask?  huge ram/
> cache and batter backed ram - thus any call to 'flush()' is
> effectively a noop and therefore blindingly fast *and* robust.  we
> failed over manually every monday and did so for over 3 years in a
> 24x7 situation with zero hitches.    this was a 250k netapp however.
> if your NFS box is just a linux box w/o special hardware i'd be  
> nervous.
> cheers.
> a @
> --
> we can deny everything, except that we have the possibility of being
> better. simply reflect on that.
> h.h. the 14th dalai lama

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