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Jamaica Unit

Error_1
Occasional Advisor

Jamaica Unit

there are two sets of connector at the back of the unit what are the differences ?

are they to illiminate Single point of failure or are they to provide access from multiple systems or ?

 

 

P.S. This thread has been moved from Disk to Disk Array. - Hp Forum Moderator

Why is abbreviation such a long word?
1 REPLY
David Allen
Frequent Advisor

Re: Jamaica Unit

Hi,

The two sets of connectors at the back of the array can be used in several ways.

1. If you have one Jamaica Array and one SCSI Interface available on a server, you would set it up as follows.
Connect a SCSI cable from the server to the upper SCSI interface B (Bus B) on the Array. Next, connect a SCSI cable from the lower SCSI interface B to the upper SCSI interface A (Bus A) and terminate the lower SCSI interface A.
You can only use up to 7 Single Ended disks in the Array, but if the are Differential disks you can use all 8 slots.

2. If you had an additional array, you could attach this to the first array and have up to 15 DF disks on the one SCSI chain. Cable up the first array as above. Connect a SCSI cable from the lower SCSI interface A on the first array (instead of a terminator) to the upper SCSI interface B on the second array. The rest of the cables on the second array are attached the same as the first.

3. The final way of setting up the array, is if you have two SCSI interfaces on your server. One SCSI cable is connected from the server to the upper SCSI interface B on the Array and a second SCSI cable is connected from the server to the upper SCSI interface A. Both the lower SCSI interfaces are terminated. This option is ideal from a performance perspective.

NOTE: Keep in mind the length of your SCSI cables. SE devices allow for a SCSI length of 6M, whereas DF can have up to 25M.

Hopefully the attached diagram will make some sense of the above.

I don't know if you can attach more than one server to one array. I'd say not.

Regards,
Dave