Otdfbt

Using Smart Storage Admin, I am trying to enable DWC.

Using this following command, I confirm slot0 is the only option and it is healthy.

sudo /opt/smartstorageadmin/ssacli/bin/ssacli ctrl all show status

HPE Smart Array P816i-a SR Gen10 in Slot 0 (Embedded)
 Controller Status: OK
 Cache Status: OK
 Battery/Capacitor Status: OK

Then I get the full status, however for this example I will grep only lines referencing cache.

sudo /opt/smartstorageadmin/ssacli/bin/ssacli ctrl slot=0 show | grep -i cache
 Write Cache Bypass Threshold Size: 1040 KiB
 Wait for Cache Room: Disabled
 Cache Board Present: True
 Cache Status: OK
 Cache Ratio: 10% Read / 90% Write
 Configured Drive Write Cache Policy: Default
 Unconfigured Drive Write Cache Policy: Default
 Total Cache Size: 4.0
 Total Cache Memory Available: 3.8
 No-Battery Write Cache: Disabled
 Cache Backup Power Source: Batteries

Now I notice that it says Configured and Unconfigured Drive Write Cache Policy are both Default.

So I try to enable dwc, but it gets mad about a 'usage' parameter.

sudo /opt/smartstorageadmin/ssacli/bin/ssacli ctrl slot=0 modify dwc=enable

Error: Parameter "usage" must be specified.

I know that, based on the help docs, usage can be unconfigured, configured, or hbc.

<target> modify [drivewritecache=enable|disable|default|?]
 [usage=configured|unconfigured|hba] [forced]
 Enables or disables the physical drive write cache policy for the
 controller.The target can be any valid controller target that supports drive
 write cache policy.

Online I have found a number of PDFs that mention using wildcards when trying to enable drive write cache and they referenced usage as if it is a target state to be used for only enabling it on drives that match this state. Based on this logic, it seems I would want to use 'usage=unconfigured' to enable it on this drive. Am I wrong in my logic?