Compaq ProLiant Clusters HA/F100 Administrator's Manual page 54

2-20 Compaq ProLiant Clusters HA/F100 and HA/F200 Administrator Guide
HA/F100 Fibre Channel Data Paths
The Compaq StorageWorks RAID Array 4000 or Compaq StorageWorks
RAID Array 4100 storage system is the mechanism with which ProLiant
Clusters implement shared storage. Generally, the storage system consists of a
host bus adapter in each server, a storage hub or switch, a Compaq
StorageWorks RA4000 Controller, and a Compaq StorageWorks RAID Array
4000 or Compaq StorageWorks RAID Array 4100 (RA4000/4100) into which
the SCSI disks are placed.
The RA4000/4100 storage system has two distinct data paths, separated by the
Fibre Channel storage hub or FC-AL switch:
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The first data path runs from the host bus adapters in the servers to the
Fibre Channel storage hub or FC-AL switch.
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The second data path runs from the Fibre Channel storage hub or
FC-AL switch to the RA4000/4100.
The effects of a failure will vary depending on whether the failure occurred on
the first or second data path.