When you have a planned server outage of the Principal Server. For example, if you are swapping or upgrading hardware or software component.
When the SQL Witness Server is down or unavailable.
Failure to do this will make the Imorgon product unavailable for the duration of the SQL Witness Server outage. This is because for the SQL Mirroring to work properly in the "high safety mode" at least 2 of the servers must be up from the mix of servers. If you have lost the communications to both the Witness and the Principal server, you must contact Imorgon Support to break the SQL Mirroring manually and bring the Mirror server to a stand-alone SQL server. This is a very time-consuming (expensive) process to perform especially when we need to restore the mirroring when the original Principal server goes back into operation. Therefore please weigh this factor into doing this process.
Things should operate normally. Imorgon workstations on the local network will operate continuously and if the "Virtual IP Address" is configured on the network, the modalities can send images to Imorgon server without requiring to change the DICOM destination.
Database backup in most cases will stop operating therefore you would want to make the time while fail-over to be relatively short, say no more than 48 hours. Your Primary server should almost always assume the Principal role as much as possible.
It is also a good idea to contact Imorgon support at iCare@imorgon.net that you plan to fail the systems over because the moment you do this, our monitoring system will alert the changes to us and if we did not hear from you we will start checking and even try to "fix" the problem by re-failing back or attempt to remotely restart computers.
While system and users should not experience a downtime, this is a complex system and there is a chance that some of the systems (workstation and modalities) may not respond or operate properly. Therefore we recommend that you consider sending a quick note to all clinical users that you have a scheduled maintenance and that you do not expect a downtime, but possible problems should be reported to you right away.