From: Anton Starikov Subject: Re: NFS cache problem Date: Thu, 26 May 2005 02:29:06 +0200 Message-ID: <42951852.6050501@utwente.nl> References: <429503BA.4060908@utwente.nl> <1117064050.12336.67.camel@lade.trondhjem.org> <42950DCE.9050109@utwente.nl> <1117066353.12336.82.camel@lade.trondhjem.org> Mime-Version: 1.0 Content-Type: text/plain; charset=KOI8-R Cc: nfs@lists.sourceforge.net Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.12] helo=sc8-sf-mx2.sourceforge.net) by sc8-sf-list2.sourceforge.net with esmtp (Exim 4.30) id 1Db6FN-0005PH-0m for nfs@lists.sourceforge.net; Wed, 25 May 2005 17:29:13 -0700 Received: from netlx050.vf.utwente.nl ([192.87.17.19]) by sc8-sf-mx2.sourceforge.net with esmtp (Exim 4.41) id 1Db6FM-0003W3-IN for nfs@lists.sourceforge.net; Wed, 25 May 2005 17:29:13 -0700 Received: from [130.89.204.129] (hantst.kabel.utwente.nl [130.89.204.129]) by netlx050.vf.utwente.nl (8.11.7/HKD) with ESMTP id j4Q0T7t13927 for ; Thu, 26 May 2005 02:29:07 +0200 In-Reply-To: <1117066353.12336.82.camel@lade.trondhjem.org> Sender: nfs-admin@lists.sourceforge.net Errors-To: nfs-admin@lists.sourceforge.net List-Unsubscribe: , List-Id: Discussion of NFS under Linux development, interoperability, and testing. List-Post: List-Help: List-Subscribe: , List-Archive: Trond Myklebust wrote: > "noac" just means that the client rereads the attributes every time it > reads or writes. > If the size and the mtime on the file haven't changed, then the client > assumes the data in the file itself also hasn't changed. That is usually > a good assumption on something like XFS (which has nanosecond precision > on mtime). It can be rather inaccurate on something like EXT3 (which has > a precision of only 1 second on mtime). I use ReiserFS. And here we talk not about seconds...we talk about hours sometimes. That's seems too strange for me. For seconds I can find plenty of explanations :) In principal even if it will be one minute, I'll be much more happy than now. > If you seriously need uncached reads and writes, then you should rather, > consider using O_DIRECT. Unfortunatelly this is not trivial problem. A lot of software are involved here. And I beleive that NFS should be able to work in this conditions properly. At least it did with solaris in similar environment. Best, Anton. ------------------------------------------------------- SF.Net email is sponsored by: GoToMeeting - the easiest way to collaborate online with coworkers and clients while avoiding the high cost of travel and communications. There is no equipment to buy and you can meet as often as you want. Try it free.http://ads.osdn.com/?ad_id=7402&alloc_id=16135&op=click _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs