Deploying ccmcache location and size changes, part two.

If you didn’t read part one, you can find it at this link.

My original issue was with systems during migration defaulting back to incorrect ccmcache location and size values. Rather than continuing to deploy to specific systems to resolve, I went ahead and created a configuration item to ensure all client systems are set to intended values.

If you’re only looking to change the ccmcache size, there is an item for this now in Client Settings policies. Unfortunately, that doesn’t allow for changing location. I haven’t vetted this in a lab, but I wouldn’t be surprised making this change in client settings also locks you from modifying the values client-side. This won’t work for me, I have a small number of applications that break the 5120MB barrier. Not enough that I want to increase all systems cache sizes, but enough that I don’t want to revert to manual installations.

Using a compliance item will allow for me to make changes in the future as needed during installations, but also ensure that the value is changed back to standard afterward.

First, we create a Configuration Item with both a discovery script and a remediation script.

ci-1

When you click Next, you’ll be prompted for a list of applicable operating systems. I selected all as in my environment, I’d like all my configmgr clients using the same values and thus enforced in the same manner. In an environment where separate values may be needed based on demand, you’d likely create multiple configuration items to include in multiple configuration baselines.

ci5

For discovery of the value we’re looking for, we use the following Powershell bit to query the SoftMgmtAgent WMI namespace for the CacheConfig class values. We simply return the values of the cache size and location to console.

[code language=”powershell”]$Cache = Get-WmiObject -Namespace ‘ROOT\CCM\SoftMgmtAgent’ -Class CacheConfig
write-host $Cache.Size $Cache.Location[/code]

ci3

The value returned, in my environment (and by default), should be: “5120 C:\Windows\ccmcache”. We know that if a client system returns anything else, it does not conform to our desired values for ccmcache and we need to run another script to fix that. In the rule creation below, I’m setting the expected returned value from the discovery script and enabling remediation where necessary.

ci6

Our remediation script is pretty simple, too. We know the client’s settings aren’t 5120MB and C:\Windows\ccmcache, so I correct that with the following:

[code language=”powershell”]$Cache = Get-WmiObject -Namespace ‘ROOT\CCM\SoftMgtAgent’ -Class CacheConfig
$Cache.Location = ‘C:\Windows\ccmcache’
$Cache.Size = ‘5120’
$Cache.Put()
Restart-Service -Name CcmExec[/code]
ci4

ci7

The CcmExec service restart is necessary to apply the new values. I was not able to find a documented alternative to this.. so systems that run the remediation script will have their CcmExec service restarted. Implications from this: Software Center instances will close automatically. Potential policy evaluations and subsequent balloon notifications upon service initialization.

I opted to only remediate during maintenance windows for my Configuration Baselines, so this is less of a concern but still something to be aware of.

Once you’ve created your CI, add it to a pilot Configuration Baseline deployed to a small batch of test systems. I generally use a few different Win7, Win10, and usually even an XP system. In this case, I left a few default and changed the ccmcache size and/or location on the bulk of them. Their values were all uniform during the next maintenance window.

 

 



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Posted December 6, 2016 by Chris in category "Desired Configuration Management", "System Center Configuration Manager

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