| 1 | <?xml version='1.0' encoding='UTF-8'?>
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| 2 | <!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
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| 3 | <topic xml:lang="en-us" id="ts_win-host-iscsi">
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| 4 | <title>Running an iSCSI Initiator and Target on a Single System</title>
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| 5 |
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| 6 | <body>
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| 7 | <p>
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| 8 | Deadlocks can occur on a Windows host when attempting to access
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| 9 | an iSCSI target running in a guest virtual machine with an iSCSI
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| 10 | initiator, such as a Microsoft iSCSI Initiator, that is running
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| 11 | on the host. This is caused by a flaw in the Windows cache
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| 12 | manager component, and causes sluggish host system response for
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| 13 | several minutes, followed by a "Delayed Write Failed" error
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| 14 | message in the system tray or in a separate message window. The
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| 15 | guest is blocked during that period and may show error messages
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| 16 | or become unstable.
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| 17 | </p>
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| 18 | <p>
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| 19 | Setting the <codeph>VBOX_DISABLE_HOST_DISK_CACHE</codeph>
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| 20 | environment variable to <codeph>1</codeph> enables a
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| 21 | workaround for this problem until Microsoft addresses the issue.
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| 22 | For example, open a command prompt window and start
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| 23 | <ph conkeyref="vbox-conkeyref-phrases/product-name"/> like this:
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| 24 | </p>
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| 25 | <pre xml:space="preserve">set VBOX_DISABLE_HOST_DISK_CACHE=1
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| 26 | VirtualBox</pre>
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| 27 | <p>
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| 28 | While this will decrease guest disk performance, especially
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| 29 | writes, it does not affect the performance of other applications
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| 30 | running on the host.
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| 31 | </p>
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| 32 | </body>
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| 33 |
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| 34 | </topic>
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