All clustered Barracuda Spam Firewalls that have recently upgraded to firmware version 3.5, models 400 and above.
When clustered Barracuda Spam Firewalls using per-user quarantine inboxes are upgraded to firmware version 3.5, they re-synchronize all of their information. In large clusters, or in clusters with a particularly large number of stored quarantine e-mails, or in clusters with particularly large stored quarantine e-mails (large attachments, etc.), this can take a long time. In some cases, hundreds of gigs of data in total must be transferred across the network, and in an in-production environment, this can sometimes take days or weeks to complete. If you notice a high CPU load, sluggish interface, or other symptoms on your clustered Spam Firewalls after upgrading to 3.5, this is a possible reason. This syncing process is a lower priority than the act of processing mail, so mail production should never be affected.
This is a one-shot consequence of upgrading to 3.5. If you are at all concerned about the state of your systems after upgrading to 3.5, please call Barracuda Networks Technical Support.
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