Software internals

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UpdatesHandler reflects that the update install is done and we are now waiting for a reboot. Now that we have the update installed CAS marks the content as eligible to be removed from the cache. Note that this does not mean that the content will be removed — simply that it is OK to delete it if space is needed for additional content coming down.

WUAHandler reflects the install is complete. SDMAgent reflects the install is complete and we are waiting for a reboot.

Finally, updateshandler reflects the update is complete and we are waiting for a reboot. OK, all done — and hopefully our flow of events for update deployment makes more sense now. But, there is more to know besides just the logs. WMI plays a key role for information storage and retrieval. There are lots of WMI namespaces that get touched as part of the software update process. The graphic shows many of the namespaces involved in software updates — we will walk through a few of them. Earlier I mentioned there is a way to easily force the client to produce new scan results rather than using cached.

The following shots show the class as well as the detail that is kept regarding scan history. If you want to force fresh scan results simply delete the entry here and re-scan. If you want to see all of the scan tools that are in use on the client take a look at the scantoolinstance class in the same namespace. Typically you will only have one entry here that maps to the WSUS server.

Update deployment first starts in the policy namespace. This class holds the assignment ID for update deployments targeted at the client. Each update deployment defined in the console will have a unique GUID listed here with details about the associated updates. In this case we just have the one. There are several classes here. This will list the assignment — the same assignment GUIDs as seen in the policy namespace — and report on their overall compliance.

To illustrate I took this screenshot is from a system where the deployment was mandatory. Updates are listed by update GuID. OK, almost done. Last thing. Earlier I mentioned that I used trace32 to merge various logs and watch the activity as different components interacted with each other.

To do that you need to open trace32 itself — with no logs open — select file? Once the logs are merged go down to the time stamp where you expect all of the action to start and enjoy! Another log reading trick that can be helpful for components where multiple threads are active at once is to find the activity where you want to focus investigation, look at the thread number and filter the log for just entries with the thread. You must be a registered user to add a comment.

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