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Dual-Ported 2Gb/s FC-AL drive

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Fernando Boza
Regular Advisor

Dual-Ported 2Gb/s FC-AL drive

In the manual of EVA4100 say:

The dual-ported 2Gb/s FC-AL drives provide redundancy and load balancing.

What mean balancing in this case?
3 REPLIES
Uwe Zessin
Honored Contributor
Solution

Re: Dual-Ported 2Gb/s FC-AL drive

The FC_AL ports on the EVA disk drives are active/active which means that they can be used at the same time.

It does not make sense for a single disk drive as it cannot really provide such a high throughput, but it allows the controllers to use both bak-end loops and spread the load that way.
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Fernando Boza
Regular Advisor

Re: Dual-Ported 2Gb/s FC-AL drive

Any technical information indicating that?
Uwe Zessin
Honored Contributor

Re: Dual-Ported 2Gb/s FC-AL drive

Not really I am afraid, sorry.

The active/active claim comes from a technical introduction to the EVA5000 from late 2001 (it was a special event where Mark Lewis talked about his ENSA II vision. Well, about half a year later, he went to EMC). As far as I can tell, there is still no disk drive on the market that can transfer 200 or more MegaBytes /second to/from media.

HP used to provide some details of their EVA FC disk drives in a separate quickspec document some years ago, but the transfer rate from media was not published.
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