About SAN policies
Citrix Provisioning clients always failover to server side cache during boot when the vDisk mode is set toCache in device RAM with overflow on hard disk.
Tip:
An option has been removed from theCache typefield in thevDisk Propertieswindow. The optionCache on device hard diskis no longer available from the list because it does not support ASLR. The replacement for this field isCache in device RAM with overflow on hard disk. For more information, seeFeatures removed from future releases.
Resolving failover to server side caching during boot
In a provisioning target device booting in private vDisk mode or maintenance vDisk version, open a command prompt with administrator privileges.
Run the DiskPart utility, using the following command:
diskpartTo verify the SAN policy, run the command:
Diskpart > sanThe SAN policy is configured asOnline All for PVS target devices. Ths configuration allows it to function correctly while inCache in Device RAM with Overflow on Hard Diskmode.
To change the SAN policy, run the command:
Diskpart > san policy=OnlineAll关闭目标设备和改变vDisk mode tostandard imageor promote the maintenance version totestorproduction version.
Note:
The SAN policy causes the write cache drive to remain offline. During boot, the target device determines that the write cache drive is ineligible for use as a write cache. As a result, it fails over to server side cache.
Important considerations
When creating a machine template, ensure that it has a similar hard disk drive structure. The machine template must boot from a vDisk in private image mode. For example:
- To PXE boot a VM with write cache, create a VM with 1 hard disk drive.
- To use Boot Device Manager (BDM) to boot a VM with write cache, create a VM with 2 hard disk drives.