Compaq ProLiant 6400R Compaq Parallel Database Cluster Model PDC/05000 for Ora - Page 32

SCSI Cabling Examples, SCSI Bus Addressing

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2-8 Compaq Parallel Database Cluster Model PDC/O5000 for Oracle8i and Windows 2000 Administrator Guide If you do not install the optional Large LUN utility in you cluster, there are two accepted methods for distributing LUNs for storagesets: I You can distribute eight LUNs between the same-numbered ports on both array controllers so that a total of 16 LUNs are assigned across all four controller ports in each storage subsystem. For example, assign LUNs 0 through 3 to array controller A port 1, LUNs 4 through 7 to array controller B port 1, LUNs 100 through 103 to array controller A port 2, and LUNs 104 through 107 to array controller B port 2. If array controller A fails in multibus failover mode, Secure Path automatically gives controller B control over I/O transfers for LUNs 0-3 on port 1 and LUNs 100-103 on port 2. I You can distribute eight LUNs across all four array controller ports. For example, assign LUNs 0 and 1 to array controller A port 1, LUNS 2 and 3 to array controller A port 2, LUNS 4 and 5 to array controller B port 1, and LUNs 6 and 7 to array controller B port 2. In this configuration, a single controller port can access all eight LUNs in the event of a path failure on the other three ports. If you do install the optional Large LUN utility in your cluster, then you must follow these guidelines: I Do not assign unit offsets to any connections. I Use unit identifiers D0 through D63 for port 1 connections and D100 through D163 for port 2 connections. I Distribute the LUNs evenly across all four array controller ports. SCSI Cabling Examples SCSI Bus Addressing The two array controllers in each MA8000/EMA12000 Storage Subsystem controller enclosure receive I/O data from the cluster nodes, process it, and distribute this data over single-ended UltraSCSI buses to as many as six disk enclosures. Each bus has 16 possible SCSI bus identifier IDs (0-15). The following devices use a SCSI bus address ID and are classified as SCSI bus "nodes": I Array controllers (A and B) I EMUs in the controller enclosure I Physical disk drives in the disk enclosures

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2-8
Compaq Parallel Database Cluster Model PDC/O5000 for Oracle8i and Windows 2000 Administrator Guide
If you do not install the optional Large LUN utility in you cluster, there are
two accepted methods for distributing LUNs for storagesets:
■
You can distribute eight LUNs between the same-numbered ports on
both array controllers so that a total of 16 LUNs are assigned across all
four controller ports in each storage subsystem. For example, assign
LUNs 0 through 3 to array controller A port 1, LUNs 4 through 7 to
array controller B port 1, LUNs 100 through 103 to array controller A
port 2, and LUNs 104 through 107 to array controller B port 2. If array
controller A fails in multibus failover mode, Secure Path automatically
gives controller B control over I/O transfers for LUNs 0-3 on port 1 and
LUNs 100-103 on port 2.
■
You can distribute eight LUNs across all four array controller ports. For
example, assign LUNs 0 and 1 to array controller A port 1, LUNS 2 and
3 to array controller A port 2, LUNS 4 and 5 to array controller B port 1,
and LUNs 6 and 7 to array controller B port 2. In this configuration, a
single controller port can access all eight LUNs in the event of a path
failure on the other three ports.
If you do install the optional Large LUN utility in your cluster, then you must
follow these guidelines:
■
Do not assign unit offsets to any connections.
■
Use unit identifiers D0 through D63 for port 1 connections and D100
through D163 for port 2 connections.
■
Distribute the LUNs evenly across all four array controller ports.
SCSI Cabling Examples
SCSI Bus Addressing
The two array controllers in each MA8000/EMA12000 Storage Subsystem
controller enclosure receive I/O data from the cluster nodes, process it, and
distribute this data over single-ended UltraSCSI buses to as many as six disk
enclosures. Each bus has 16 possible SCSI bus identifier IDs (0-15).
The following devices use a SCSI bus address ID and are classified as SCSI
bus
“
nodes
”
:
■
Array controllers (A and B)
■
EMUs in the controller enclosure
■
Physical disk drives in the disk enclosures