6.0.1

However, ESXi might not recognize certain storage devices as ash devices when their vendors do not
support automatic ash device detection. In other cases, certain non-SATA SAS ash devices might not be
detected as local. When devices are not recognized as local ash, they are excluded from the list of devices
oered for Virtual SAN or virtual ash resource. Marking these devices as local ash makes them available
for virtual SAN and virtual ash resource.
Mark Storage Devices as Flash
If ESXi does not automatically recognize its devices as ash, mark them as ash devices.
ESXi does not recognize certain devices as ash when their vendors do not support automatic ash disk
detection. The Drive Type column for the devices shows HDD as their type.
C Marking HDD disks as ash disks could deteriorate the performance of datastores and services
that use them. Mark disks as ash disks only if you are certain that those disks are ash disks.
Prerequisites
Verify that the device is not in use.
Procedure
1 Browse to the host in the vSphere Web Client object navigator.
2 Click the Manage tab, and click Storage.
3 Click Storage Devices.
4 From the list of storage devices, select one or several HDD devices that need to be recognized as ash
devices and click the Mark as Flash Disks icon.
5 Click Yes to save your changes.
The type of the devices changes to ash.
What to do next
If the ash device that you mark is shared among multiple hosts, make sure that you mark the device from
all hosts that share the device.
Mark Storage Devices as Local
ESXi enables you to mark devices as local. This is useful in cases when ESXi is unable to determine whether
certain devices are local.
Prerequisites
n
Make sure that the device is not shared.
n
Power o virtual machines that reside on the device and unmount an associated datastore.
Procedure
1 Browse to the host in the vSphere Web Client object navigator.
2 Click the Manage tab, and click Storage.
3 Click Storage Devices.
4 From the list of storage devices, select one or several remote devices that need to be marked as local and
click the Mark as Local for the Host icon.
5 Click Yes to save your changes.
Chapter 14 Working with Flash Devices
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