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тАО09-23-2006 11:51 PM
тАО09-23-2006 11:51 PM
why the new EVA disk locate at the middle of the enclosure
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тАО09-24-2006 04:58 AM
тАО09-24-2006 04:58 AM
Re: why the new EVA disk locate at the middle of the enclosure
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тАО09-24-2006 05:56 PM
тАО09-24-2006 05:56 PM
Re: why the new EVA disk locate at the middle of the enclosure
It relates to the back-end cabling configuration. The enclosures are considered 'dual channel' just like some scsi enclosures. One i/o module can talk to bays 1-7 and the other can talk to 8-14. This reduces the latency of talking to the disks in the FCAL environment.
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тАО09-24-2006 06:35 PM
тАО09-24-2006 06:35 PM
Re: why the new EVA disk locate at the middle of the enclosure
That fits well with what I have learned: the "A" I/O module talks to the "A" FC port of *all* 14 disk drives and the "B" I/O module talks to the "B" ports.
If an I/O module could only talk to half of the bays in an enclosure, there were no redundancy between a dual-loop (A/B).
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тАО09-29-2006 07:31 AM
тАО09-29-2006 07:31 AM
Re: why the new EVA disk locate at the middle of the enclosure
Drives in the middle can be equally cooled by both blowers -> lower overall temperature -> lower RMP
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тАО09-29-2006 08:54 AM
тАО09-29-2006 08:54 AM