Re: 3Ware 7506-8, anyone have any luck? I don't...

[KELEMEN Peter <Peter.Kelemen@cern.ch>]

* Scott T. Smith (scott@gelatinous.com) [20041015 11:55]:

> then filter out email based on duplicate message-ids! :-P

I would if the corporate Exchange would _let_ me have duplicates.
It does not.  Moreover, I'm setting Mail-Followup-To: which _you_
are not honoring.

> When issueing random reads of 1 megabyte each, I get 2
> gigabits/sec from the Highpoint, and 1.5 gigabits/sec from the
> 3ware, when using a single controller and 8 disks (WD 250GB).
> No RAID, just JBOD mode, all disks in use at once.

Cannot comment on this one, haven't done measurements myself.  We
don't use random I/O much.

> the 8506 won't even let me set the disk up as a JBOD.  In order
> to zap it, I need yet another controller!

Do it with the 9xxx.  Interesting though... did you let 3ware know
about it?  (We do not have 8506s yet.)

> That's the funny thing about the 3ware 12 disk controllers; they
> don't even have the bandwidth to support all 12 disks!

Theoretically you could get 12*50 MiB/s out from the disks.  PCI
limit is just 12% lower.  Add processing overhead you are about to
go.

> It truly depends on what you want to use it for.  If you want
> RAID5, you most likely want a hardware solution, so yeah, 3ware
> would be the way to go.

Agreed.

> If you want JBOD though, I'd go with Highpoint.

Thanks for the data point.

Peter

-- 
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 Kelemen Péter     /       \       /       \     Peter.Kelemen@cern.ch
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