Dell SE500W manual Preparing the Perc RAID Adapter for Clustering, Important System Warning

In joined-bus and cluster modes, if a secondary EMM receives a message that the primary EMM has failed, the fault LED indicator on the primary EMM is illuminated and the condition is reported back to the host initiator. The secondary EMM then becomes active and holds the failed primary in a state of reset until it is replaced. If the primary EMM detects that the secondary has failed, the secondary’s fault LED indicator is illuminated and the failed status is reported back to the host initiator.

NOTE: In split-bus mode, each EMM controls half of the enclosure. If one EMM fails in split-bus mode, the second EMM reports the failure but does not assume control of the entire SCSI bus.

The primary EMM is always plugged into the slot on the left (viewed from the back of the system). In a redundant joined-bus configuration, the primary EMM assumes control of all the enclosure functionality. In addition, the primary EMM is the only module that reports the status of the system to the host initiator through SES and SAF-TE protocols. Because the secondary EMM must assume the responsibilities of the primary in the event that the primary fails, both the primary and secondary EMMs are continuously monitoring the status of the

system’s components.

Preparing the PERC RAID Adapter for Clustering

The warning message shown in Figure 3-3 appears on your screen when you attempt to modify the configuration of the shared storage system on your cluster by using the PERC RAID adapter BIOS configuration utility.

Figure 3-3. Important System Warning

!!!STOP!!!

This operation may change the configuration of disks and can cause loss of data! Ensure:

1.Peer server is powered up for its controller NVRAM to be updated. Otherwise, disk configuration should be read from disk and saved to controller's NVRAM.

2.The second server must not be configuring the disks.

3.There is no I/O activity against shared drives.

Press Any Key To Continue

The warning message appears on the screen immediately after activating the PERC RAID adapter BIOS configuration utility by pressing <Ctrl><m> during the system’s Power-On Self-Test (POST).

Preparing Your Systems for Clustering

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