38 en Subsystem Connection and OperationRAID Subsystem
5.3 | Daisy Chain |
5.3.1 | Daisy Chain Topology |
| The RAID subsystem offers the flexibility to daisy chain additional RAID subsystems to meet |
| increasing storage needs. In a daisy chain topology, the RAID subsystem can be connected to |
| each other. The IN ports on the first subsystem are both connected to separate |
| computers. The OUT ports on the first subsystem are connected to the IN ports on the second |
| subsystem. This process is repeated for the third subsystem. |
Fig. 5.4 Daisy Chain RAID Subsystems
5.3.2 | Daisy Chain Procedures | |
| 1. | Connect the RAID subsystem to the host computer. Use the VHDCI to VHDCI SCSI cable |
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| that was provided in the packaging box. Attach one end to the host computer and the |
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| other end to the SCSI IN port on the back of the RAID subsystem. |
| 2. | Daisy chain subsystems. If you wish to connect more than one subsystem, an extra VHDCI |
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| to VHDCI SCSI cable is required. Attach one end of the cable to the SCSI OUT port and |
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| the other end to the SCSI IN port in the next subsystem. |
| 3. | Assign chassis IDs. Each chassis must be assigned a unique chassis ID before being pow- |
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| ered on. The chassis ID for the first RAID subsystem is 0. The chassis IDs for the subsys- |
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| tems connected to the first RAID subsystem are from 1 to 16. You can assign chassis IDs |
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| through the LCD panel on the subsystem, firmware, or Bosch RAIDWatch management |
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| software. (See Figure 5.4) |
| 4. | Create redundant host paths. If access to data is a critical requirement, redundant data |
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| paths to different LDs (logical drives) or logical volumes (LVs) can be created. To do this, |
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| logical units (LDs or LVs) are mapped to both host channels (CH0 and CH1 in Figure 5.4.) |
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| This will ensure that if one host computer fails, the second host computer will be able to |
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| access the logical units on that host computer. |
F.01U.027.799 V2 2008.08 | Bosch Security System |
