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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>22.3. Data Loss on Exported Primary Storage</title><link rel="stylesheet" type="text/css" href="Common_Content/css/default.css" /><link rel="stylesheet" media="print" href="Common_Content/css/print.css" type="text/css" /><meta name="generator" content="publican 2.8" /><meta name="package" content="Apache_CloudStack-Admin_Guide-4.0.0-incubating-en-US-1-" /><link rel="home" href="index.html" title="CloudStack Administrator's Guide" /><link rel="up" href="troubleshooting.html" title="Chapter 22. Troubleshooting" /><link rel="prev" href="troubleshooting-working-with-server-logs.html" title="22.2. Working with Server Logs" /><link rel="next" href="troubleshooting-recover-lost-virtual-router.html" title="22.4. Recovering a Lost Virtual Router" /></head><body><p id="title"><a class="left" href="http://cloudstack.org"><img src="Common_Content/images/image_left.png" alt="Product Site" /></a><a class="right" href="http://docs.cloudstack.org"><img src="Common_Content/images/image_right.png" alt="Documentation Site" /></a></p><ul class="docnav"><li class="previous"><a accesskey="p" href="troubleshooting-working-with-server-logs.html"><strong>Prev</strong></a></li><li class="next"><a accesskey="n" href="troubleshooting-recover-lost-virtual-router.html"><strong>Next</strong></a></li></ul><div xml:lang="en-US" class="section" id="troubleshooting-dataloss-on-exported-primary-storage" lang="en-US"><div class="titlepage"><div><div><h2 class="title" id="troubleshooting-dataloss-on-exported-primary-storage">22.3. Data Loss on Exported Primary Storage</h2></div></div></div><div class="formalpara"><h5 class="formalpara" id="idp42307296">Symptom</h5>
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Loss of existing data on primary storage which has been exposed as a Linux NFS server export on an iSCSI volume.
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</div><div class="formalpara"><h5 class="formalpara" id="idp21953984">Cause</h5>
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It is possible that a client from outside the intended pool has mounted the storage. When this occurs, the LVM is wiped and all data in the volume is lost
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</div><div class="formalpara"><h5 class="formalpara" id="idp38832632">Solution</h5>
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When setting up LUN exports, restrict the range of IP addresses that are allowed access by specifying a subnet mask. For example:
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</div><pre class="programlisting">echo “/export 192.168.1.0/24(rw,async,no_root_squash)” > /etc/exports</pre><div class="para">
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Adjust the above command to suit your deployment needs.
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</div><div class="formalpara"><h5 class="formalpara" id="idp41867584">More Information</h5>
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See the export procedure in the "Secondary Storage" section of the CloudStack Installation Guide
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</div></div><ul class="docnav"><li class="previous"><a accesskey="p" href="troubleshooting-working-with-server-logs.html"><strong>Prev</strong>22.2. Working with Server Logs</a></li><li class="up"><a accesskey="u" href="#"><strong>Up</strong></a></li><li class="home"><a accesskey="h" href="index.html"><strong>Home</strong></a></li><li class="next"><a accesskey="n" href="troubleshooting-recover-lost-virtual-router.html"><strong>Next</strong>22.4. Recovering a Lost Virtual Router </a></li></ul></body></html>
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