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Virtual shared SCSI buses are talked talked through the network using TCP/IP. In Charon configuration, we have to specify the IP address and port (ie. an IP socket) for each virtual SCSI controller, so that other virtual SCSI controllers on the same bus can talk to it.
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set PKC port[600]=17216 host[600]="192.168.13.3:16217" <== point to node B
set PKC port[500]=1721617215 host[500]="192.168.13.4:15217" <== point to node C
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In the configuration of single PC server multiple instances, the shared storage can be a locally attached physical drive, from iSCSI, Fibre Channel, and/or also Charon virtual disks.
The key point to configure shared SCSI disks in this configuration is to make sure the same DK device on different nodes are pointing to the same container.
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The configuration of multiple PC servers running Charon that use shared SCSI is a normal and close to reality configuration. It preserves high availability like OpenVMS cluster / TruCluster running on the original AlphaServer, and at the same time enjoy enjoys the flexibility of Charon. However, we cannot use Charon container files (vdisk) as the shared SCSI device in this configuration. We can only use physical disk disks from either iSCSI or Fibre Channel.
The key point to configure shared SCSI disks in this configuration is to make sure the same DK device on different nodes are pointing point to the same LUN.
Node A, on PC server A –
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set PKA container[1]=”\\.\PhysicalDrive7” ç<== LUN 8
Node C, on PC server C –
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Note that when the disks are presented to PC servers, the PhysicalDrive number of the same LUN may not be the same among different PC servers. It must be careful on that. In the above, DKA0 is LUN 7, DKA100 DKA100 is LUN 8. This is the same across all three hosts even but the PhysicalDrive number in PC server B is different from the other two.
To make this easy to manage, it is recommended to make the same PhysicalDrive number on different node nodes point to the same LUN. Some simple guidelines are listed below:
- All PC servers that participate in the shared SCSI configuration should have the same number of local diskdisks, so that when the external LUN is first presented, all the PC server servers will start with the same PhysicalDrive number
- Present the external LUN one by one, and
must doperform new device scanning after each LUN’s presentation to make sure they are in correct order - Present all permanent LUNs before you present temporary LUNs, so that when you decided to remove the temporary LUN in future, the permanent PhysicalDrive number will not change
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