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Table Of Contents
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If the virtual machine's virtual disk violates the rule, Storage DRS makes migration recommendations to
correct the error or reports the violation as a fault if it cannot make a recommendation that will correct
the error.
When you add a datastore to a datastore cluster that is enabled for Storage DRS, the VMDK affinity rule is
disabled for any virtual machine that has virtual disks on that datastore if it also has virtual disks on other
datastores.
Prerequisites
Launch the vSphere Client and log in to a vCenter Server system.
Procedure
1 In the vSphere Client inventory, right-click a datastore cluster and select Edit Settings.
2 Click Virtual Machine Settings.
3 Deselect the Keep VMDKs together check box for the virtual machine.
4 Click OK.
Clear Storage DRS Statistics
To diagnose problems with Storage DRS, you can clear Storage DRS statistics before you manually run
Storage DRS.
IMPORTANT When you enable the option to clear Storage DRS statistics, statistics are cleared every time
Storage DRS runs until you disable the option. Always disable the option after you diagnose the Storage
DRS problem.
Prerequisites
Launch the vSphere Client and log in to a vCenter Server system.
Enable Storage DRS for the datastore cluster.
Procedure
1 Enable the ClearIoStatsOnSdrsRun option.
a In the vSphere Client, right-click the datastore cluster and select Edit Settings.
b Select SDRS Automation Level and click Advanced Options.
c In the Option text box, type ClearIoStatsOnSdrsRun.
d In the corresponding Value text box, type 1.
e Click OK, then click OK again to dismiss the settings dialog box.
2 In the vSphere Client inventory, select a datastore cluster.
3 Click the Storage DRS tab and select Run DRS in the upper right corner of the page.
The current Storage DRS statistics for all datastores and virtual disks in all datastore clusters in the
vSphere Client inventory are cleared, but no new statistics are collected.
4 Change the ClearIoStatsOnSdrsRun flag value to 0 to disable it.
5 Run Storage DRS again.
Storage DRS runs normally. Allow several hours for the new setting to take effect.
vSphere Administration with the vSphere Client
378 VMware, Inc.