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POWindows file share: why sometimes newly created files aren't visible for some period of time?
 

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  1. POWindows file share: why sometimes newly created files aren't visible for some period of time?
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    <p>We were faced with very strange issue that made us crazy. Sometimes newly created files on our File Share PC were "absent" for some period of time. To reproduce a problem you should have at least two computers, call them <code>alpha</code> and <code>beta</code>. Create file share on <code>beta</code> PC (<code>\\beta\share\bug</code>) and run this PowerShell script from <code>alpha</code> PC:</p> <pre><code>param( $sharePath="\\beta\share\bug" ) $sharePC = ($sharePath -split '\\')[2] $session = New-PSSession -ComputerName $sharePC $counter = 0 while ($true) { $fileName = $sharePath + "\$counter.txt" Invoke-Command -Session $session -ScriptBlock { param( $fileName ) "" &gt; $fileName } -ArgumentList $fileName if (Test-Path $fileName) { Write-Host "File $fileName exists" -fore Green } else { Write-Host "!!! File $fileName does NOT exist!" -fore Red } $counter = $counter + 1 Start-Sleep 2 } </code></pre> <p>After starting this script you should be able to see these messages:</p> <pre><code>File \\beta\share\bug\1.txt exists File \\beta\share\bug\2.txt exists ... </code></pre> <p><strong>And now</strong>: Open <code>cmd.exe</code> and run this command:</p> <p><code>if exist \\beta\share\bug\foo.txt echo 1</code></p> <p>After this during approx 10 seconds you'll see following messages:</p> <pre><code>!!! File \\beta\share\bug\3.txt does NOT exist! !!! File \\beta\share\bug\4.txt does NOT exist! </code></pre> <p>We've discovered that bug is caused by enumerating shared directory where new files are being created. In <code>Python</code> call <code>os.listdir('//beta/share/bug')</code> to reproduce a bug. In <code>C#</code>: <code>Directory.GetDirectories(@"\\beta\share\bug")</code>. You can even simply navigate to share directory by shell and call <code>ls</code> or <code>dir</code>.</p> <p>Bug were found on <code>Windows Server 2008 R2</code></p> <p>Note, that you cannot watch directory content on <code>alpha</code> PC in Windows Explorer in real time, because if you open this directory in Explorer bug would not occur! So ensure to close all such windows before attempts to reproduce a bug. After each script restart you should manually remove all already created files from share (because script is rather stupid and always starts from 0.txt).</p> <p>We currently have 2 workarounds for this issue:</p> <ol> <li>If client sees this situation, it creates some temporary file in problematic directory - after this files magically appear.</li> <li>Disable SMB 2.0: <a href="http://www.petri.co.il/how-to-disable-smb-2-on-windows-vista-or-server-2008.htm">http://www.petri.co.il/how-to-disable-smb-2-on-windows-vista-or-server-2008.htm</a></li> </ol> <p>Does anybody have ever discovered similar problem and can explain why it occurs and how "correctly fix" it?</p> <p>Thanks</p>
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    1. COHave you looked at a network trace to see what's going on?
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    2. CONo, unfortunately I haven't looked at network trace
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