[rescue] Total corporate madness (

Curtis H. Wilbar Jr. rescue at hawkmountain.net
Mon Aug 4 14:49:06 CDT 2003

Plus, what are the IRQ requirements for a card with 8 SATA conrollers
on it ?  Is it one IRQ per controller ! ? or per card ?  How do they
handle the IRQ issues with SATA (with ATA it was one IRQ per bus).

-- Curt

>Date: Mon, 04 Aug 2003 14:13:21 -0400
>From: Steve Sandau <ssandau at bath.tmac.com>
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>To: The Rescue List <rescue at sunhelp.org>
>Subject: Re: [rescue] Total corporate madness (
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>>>Actually it is an improvement.  This means you get the full SATA
>>>bandwidth to each drive; and the CDROM will no longer slow down the
>>>disk transfers.  Having 4 or more controllers on board in each system
>>>means you can instantly do 3-drive software RAID.
>> True. If I'm not mistaken, scsi allows 256 commands to be sent to the drive 
>> once, IDE only one. Moreover, the controller has to wait for a reply to come
>> back in order to sent the next command, even if it is for the other disk of
>> the 2. So place 2 disks on the same cable and they start fighting for
>> bandwidth.
>And with SCSI, I only need *one* controller to instantly do RAID... I 
>don't think having to purchase one controller per drive in order to 
>overcome *one* of the IDE protocol's shortcomings is an improvement. To 
>duplicate even a narrow SCSI setup, you'll need to buy seven 
>controllers. I know they come 2, 4, 8 to  a card, but they ain't givin' 
>away them 8-controller ones...
>rescue list - http://www.sunhelp.org/mailman/listinfo/rescue

Curtis Wilbar
Hawk Mountain Networks
rescue at hawkmountain.net

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