From: Peter Staubach <staubach@redhat.com>
To: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: "Lever, Charles" <Charles.Lever@netapp.com>,
Charles Duffy <ccd@mailcall.com.au>,
nfs@lists.sourceforge.net
Subject: Re: Data coherency trouble with multiple clients, on2.6.14-rc5
Date: Wed, 26 Oct 2005 14:45:35 -0400 [thread overview]
Message-ID: <435FCECF.2090800@redhat.com> (raw)
In-Reply-To: <1130345451.8852.7.camel@lade.trondhjem.org>
Trond Myklebust wrote:
>on den 26.10.2005 klokka 08:27 (-0700) skreiv Lever, Charles:
>
>
>
>>i agree that O_DIRECT is the right solution. however, even with "noac"
>>i would expect mr. duffy's workload to behave correctly most of the
>>time. sounds like he is able to make it fail very easily.
>>
>>
>
>Why would you expect that?
>
>"noac" does not turn off data caching, nor does it change the policy
>that the client will not invalidate the data cache while it is holding
>the file open for write.
>
It seems to me that the policy should be to allow cache
validation/invalidation
unless the file is mmap'd for writing or if there are active WRITEs
outstanding.
Simply having the file open for write should not affect the consistency
model.
Thanx...
ps
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next prev parent reply other threads:[~2005-10-26 18:45 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-26 15:27 Data coherency trouble with multiple clients, on2.6.14-rc5 Lever, Charles
2005-10-26 16:50 ` Trond Myklebust
2005-10-26 18:45 ` Peter Staubach [this message]
2005-10-26 19:08 ` Trond Myklebust
2005-10-26 19:53 ` Peter Staubach
2005-10-26 21:05 ` Trond Myklebust
2005-10-26 21:22 ` Peter Staubach
2005-10-26 21:57 ` Trond Myklebust
2005-10-27 12:25 ` Peter Staubach
2005-10-27 12:53 ` Trond Myklebust
2005-10-27 14:25 ` Calum Mackay
2005-10-27 15:33 ` Trond Myklebust
-- strict thread matches above, loose matches on Subject: below --
2005-11-07 16:47 Data coherency trouble with multiple clients on2.6.14-rc5 Lever, Charles
2005-11-07 16:52 ` Peter Staubach
2005-10-26 6:01 Data coherency trouble with multiple clients, on 2.6.14-rc5 Charles Duffy
2005-10-26 6:23 ` Trond Myklebust
2005-10-26 7:25 ` Data coherency trouble with multiple clients, on2.6.14-rc5 Charles Duffy
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