Dell PowerVault 221S Посібник з експлуатації - Сторінка 7
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System Overview : Dell PowerVault 220S and 221S Systems Service Manual
Split-Bus Module
Your storage system supports three SCSI bus modes controlled by the split-bus module:
Joined-bus mode
Split-bus mode
Cluster mode
These modes are controlled by the position of the bus configuration switch when the system is turned on.
configuring the SCSI bus modes, see your Installation and Troubleshooting Guide.
Figure 6. Bus Configuration Switch Modes
The only difference between cluster mode and joined-bus mode is the SCSI ID assigned to the enclosure services processor on the EMM. When cluster mode is detected, the processor
SCSI ID changes from 6 to 15. As a result, SCSI ID 15 is disabled, leaving 13 available hard drives in cluster mode. This allows a second initiator, such as a host bus adapter or RAID
controller card on a second host server, to use SCSI ID 6 (see
Table 4. SCSI ID Assignments
Configuration
Joined-bus
Split-bus—primary EMM
Split-bus—secondary EMM
Cluster
NOTE:
The unshaded SCSI IDs are available for hard-drive use as indicated for each configuration. The reserved SCSI IDs are used as follows:
H = used by the host system initiator.
S = used by the storage system SES.
Figure 7. SCSI ID Numbers and Associated Hard Drives
file:///C|/Users/rishi_sood/Desktop/220s/en/sm/intro.htm[3/7/2013 12:09:13 PM]
1 joined-bus mode (top position for rack systems, right for tower systems)
2 split-bus mode (center position for rack and tower systems)
3 cluster mode (bottom position for rack systems, left for tower systems)
Table 4
for SCSI ID assignments and
Cables Used
15
14
13
1
1
1
2
S
Figure 6
illustrates the switch position for each mode. For more information on
Figure 7
for associated hard drives).
SCSI IDs Used
12
11
10
9
8
7
6
5
H
S
H
S
H
S
H
H
4
3
2
1
0