6.0.1

Virtual Flash Advanced Settings
You can change advanced options for virtual ash.
Procedure
1 In the vSphere Web Client, navigate to the host.
2 Click the Manage tab and click .
3 Under System, click Advanced System .
4 Select the seing to change and click the Edit buon.
Option Description
VFLASH.VFlashResourceUsageThr
eshold
The system triggers the Host vFlash resource usage alarm when a
virtual ash resource usage exceeds the threshold. The default threshold is
80%. You can change the threshold to an appropriate value. The alarm is
automatically cleared when the virtual ash resource usage drops below
the threshold.
VFLASH.MaxResourceGBForVmCa
che
An ESXi host stores Flash Read Cache metadata in RAM. The default limit
of total virtual machine cache size on the host is 2TB. You can recongure
this seing. You must restart the host for the new seing to take eect.
5 Click OK.
Configuring Host Swap Cache
Your ESXi hosts can use a portion of a ash-backed storage entity as a swap cache shared by all virtual
machines.
The host-level cache is made up of les on a low-latency disk that ESXi uses as a write back cache for virtual
machine swap les. The cache is shared by all virtual machines running on the host. Host-level swapping of
virtual machine pages makes the best use of potentially limited ash device space.
Depending on your environment and licensing package, the following methods of conguring the host-level
swap cache are available. Both methods provide similar results.
n
You can create a VMFS datastore on a ash device, and then use the datastore to allocate space for host
cache. The host reserves a certain amount of space for swapping to host cache.
n
If you have an appropriate vSphere license that allows you to set up and manage a virtual ash
resource, you can use the resource to congure swap cache on the host. The host swap cache is allocated
from a portion of the virtual ash resource.
Configure Host Cache with VMFS Datastore
Turn on the host's ability to swap to host cache. You can also change the percentage of space allocated for
host cache.
Use this task if you do not have an appropriate licence that allows you to set up and manage a virtual ash
resource. If you have the license, use the virtual ash resource for host cache conguration.
Prerequisites
Create a ash-backed VMFS datastore. See “Create a VMFS Datastore,” on page 160.
Procedure
1 Browse to the host in the vSphere Web Client navigator.
2 Click the Manage tab, and click Storage.
Chapter 14 Working with Flash Devices
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