In Microsoft Windows 2003 and Windows 2000 operating systems, volumes on new disks are not automatically mounted and assigned drive letters by default when added to the system at boot-up. As a result, when a disk is no longer accessible due to a malfunction (for example, a bad cable), the Windows operating system will treat this as a Removable Disk event. Figure 1 shows the event posted when Windows no longer detects a disk. This can be caused by a failure in the Enclosure unit or a miss-configuration of the storage. Using the ServeRAID Manager, ensure that the device (logical drive) is still available to this initiator by checking the Access control list..
Figure 1. W2003 – Disk drive
disappeared event
Several things can cause a drive to disappear:
· A failed path to the controller.
· LUNs may have gotten stuck in transition during a failover operation. This event does not get reported in the NT event log; however, IOs will fail due to the drives being no longer available to the OS.
Once controller is on line, do a CLI “array failback” or right click the enclosure in the ServeRAID GUI and select “failback storage”. This will move the logical drives assigned to that controller back to their preferred path.
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