ATTO Technology FibreBridge 3300R, Installation And Operation Manual

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38
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FC Initiator 1 FC Initiator 2
ATTO FibreBridge 1
SCSI
SCSI target
Fibre Channel
Arbitrated Loop or
Fabric
Multiple Fibre Channel Initiators
1. Fibre Channel Initiator 1 sends the
Reserve command through the FC-AL to the
FibreBridge.
2. The FibreBridge determines that no
reservation conflict exists at Tier 1.
3. The FibreBridge sends the
Reserve
command to the SCSI target.
4. The SCSI target is reserved.
5. Fibre Channel Initiator 2 sends the
Reserve command through the FC-AL to the
FibreBridge.
6. The FibreBridge determines the SCSI
device is already reserved.
7. The FibreBridge rejects FCInitiator 2's
command and returns
reservation conflict .
8. The SCSI target is reserved until a
Release command is sent by FC Initiator 1.
FC Initiator 4 FC Initiator 1 FC Initiator2 FC Initiator 3
ATTO FibreBridge 1 ATTO FibreBridge 2
SCSI target
SCSI bus SCSI bus
Fibre Channel
Arbitrated Loop
Fibre Channel
Arbitrated Loop
Class 3: Multiple FC & SCSI Initiators
1. Fibre Channel Initiator 1 sends the command
Reserve through the FC-AL to FibreBridge 1.
2. FibreBridge 1 determines the command is valid.
3. FibreBridge 1 sends the command
Reserve
to the
SCSI target.
4. The SCSI target is reserved.
5. Fibre Channel Initiator 3 sends the command
Reserve through the FC-AL to FibreBridge 2.
6. FibreBridge 2 determines the command is valid.
7. FibreBridge 2 sends the command
Reserve to the
SCSI target.
8. The SCSI target is already reserved and rejects
FibreBridge 2's command.
9. FibreBridge 2 returns
reservation conflict
to Fibre
Channel Initiator 3.
10. The SCSI target is reserved until a
Release
command is sent by Fibre Channel Initiator 1. No
Reserve commands by any other initiator will be
accepted.
Exhibit 9.0-2 Example 2: Multiple Fibre Channel initiators share a Fibre Channel connection on the FC-AL with a
FibreBridge and there are no other initiators on the SCSI bus.
Exhibit 9.0-3 Example 3: Several Fibre Channel initiators share a Fibre Channel connection on the FC-AL with a
FibreBridge, and several initiators share the SCSI bus. In this topology, FibreBridge caching must be completely
disabled or the FibreBridge may return stale data.