Best Practice for CQ Updates in complex installations (clustering, replication)?

Hi everybody,
we are planning a production setup of CQ 5.5 with an authoring cluster replicating to 4 publisher instances. We were wondering what the best update process looks like in a scenario like this. Let's say, we need to install the latest CQ 5 Update - which we actually have to -:
Do we need to do this on every single instance, or can replication be utilized to distribute updates?
If updating a cluster - same question: one instance at a time? Just one, and the cluster does the rest?
The question is really: can update packages (official or custom) be automatically distributed to multiple instances? If yes, is there a "best practice" way to do this?
Thanks for any help on this!
Henning

Hi Henning,
The CQ5.5 servicepacks are distributed as CRX packages. You can replicate these packages and on the publishs they are unpacked and installed.
In a cluster the situation is different: You have only 1 repository. So when you have installed the servicepack on one node, the new versions of bundles and other stuff is unpacked to the repository (most likely to /libs). Then the magic (essentially the JcrInstaller) takes care, that the bundles are extracted to started.
I would not recommend to activate the service pack in a production environment, because then all publishs will be updated the same time. And as a restart is required, you might encounter downtimes. Of course you can make it work when you play with the replication agents :-)
cheers,
Jörg

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