Problem with mpt(4) and Infortrend RAID

[Oliver Brandmueller]

Hello.

On Fri, Feb 04, 2005 at 06:25:59PM +0800, Rong-En Fan wrote:
>   1. set the channel to 160MB/s (sync clock is 80Mhz)

This does the trick for me, I discovered that just a few days ago.

>   2. map 1 logical drive to 1 channel (I have two channels
>      on raid)

This did not work for me, tried that before.

> By the way, if I use 320MB/s and plug the RAID into another
> Adaptec 29320LP (ahd(4)), it fails when bus scanning. On the
> other hand, 160MB/s is fine.

*hehe* I just got me an Adaptec also to test and saw the same. I even 
installed Linux and tested it and always get the same results: With 
320MB/s there are problems. With 160 MB/s there are now problems.

FreeBSD-wise I would say: "fixed" (meeaning there was not a problem).

> any suggestion about this?

Yes, we're gonna talk a little to Infortrend, while buying nice U320 
hardware and getting something that does only work as U160 is not nice. 
For some time I can still live with U160, but when I start upgrading 
capacities here it will make a difference in the number of SCSI channels 
needed.

Funny, in the Infortrend FAQ you find a lot of "How do I downgrade 
Controler XXX from 320 MB/s to 160 MB/s", but they never tell you, why 
you should do that. But reading this you get the feeling, they know 
about this problem.

- Oliver

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