Rerun the svc_cache -get cmd again until the state is 8 (disabled). If the output of svc_cache -get is a state of 7, this means that the dirty pages are still flushing. The goal is to get to a state of 8 (disabled). See more detailed example outputs in the Additional Notes section. Confirm write cache is disabled: svc_cache -get.Disable write cache: svc_cache -disable (The command only needs to run on one SP to disable cache on both SPs).Get the state of write cache: svc_cache -get (State 3 is enabled, state 7 is disabling or unknown, state 8 is disabled).Running the svc_cache -get command returns the usage of the command: To test this, we use the svc_cache -get command. It responds differently depending on whether the svc_cache command has already been extended with the new commands. If you run one of the new commands, you can determine whether the package is installed. The new commands are listed here and explained in more detail below:ĭETERMINING IF THE UPDATED svc_cache COMMAND IS ALREADY INSTALLED If the bolded commands are copied to a notepad from this KB, the double hyphen is more defined.

NOTE: Depending on the browser used, the font may distort the - (double hyphen) in the commands, especially the bolded lines.Īfter the svc_cache command, the parameter is preceded by a - (double hyphen) not a single. This eliminates the need for the manual installation, once the Unity array is upgraded to an updated OE code.

Update: The svc_cache command update is now bundled in Unity OE release 5.2 and above.

This is a benefit to allow the cache updates to be done without the need for root shell, and engaging a higher level of support. The svc_cache command has been updated to include three new switches: -get, -disable, and -enable. This update must be loaded on to your Unity system by Dell Technical Support or your Authorized Service Provider. TSEs should review and follow the work order creation instructions in the Internal Notes of this Dell Knowledge Base article. This is to avoid any potential impact in the unlikely event of a secondary issue occurring on the peer SP while performing the maintenance activity.Īn SP hardware maintenance activity is defined as any replacement of any of the following list of parts:Īdditionally, the following activities are also considered to be affected hardware maintenance activities for which disabling write cache is recommended: It is a recommended best practice to disable write cache before performing any scheduled SP hardware maintenance activity.

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