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Event ID: 812 Source: rdacdisk

SCSI-3 Reservation key is invalid.
We got this event on an IBM BladeCenter HS20 Blade. The BladeCenter is connected to an IBM DS4300 Turbo SAN. We where trying to bring Physical Disk resources online. These failed with lots of errors. When we uninstalled the RDAC drivers, the resources could be brought online without any errors. This situation is currently still in place as a workaround.
The downside of this situation is that in Disk Management we have about 3 times as much disks as we need. The active path on the SAN gives us a usable disk, the failover path gives us a non-usable disk and there are a few management LUNs for managing the SAN using SCSI.

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