[K12OSN] new server serial ATA or SCSI

[Chris Kacoroski]

This may be a bit late, but I have ordered a server with 2TB of SATA 
drives hooked into a single 3ware card.  I will run some tests when I 
get it (should be a few weeks) and post them.

cheers,

ski

--
"When we try to pick out anything by itself, we find it
   connected to the entire universe"		John Muir

Chris "Ski" Kacoroski, ckacoroski at nsd.org, 425-489-6263

On Feb 19, 2004, at 12:37 AM, Ken Meyer wrote:

> My understanding has been that early IDE controllers could deal with 
> only
> one of the two potentially connected devices at a time.  That was why 
> it was
> recommended that you put your hard drive and CD on different 
> controllers.
> Then, at some point, it seemed that the devices could be accessed
> independently.  It has never been clear to me how you can tell if they 
> are
> or aren't, or even if it is done in the controller or the drivers, but 
> I
> have presumed that it is SOP, probably in hardware, by this time.
>
> How many SATA drives can you put on a controller?  SCSI allows a lot, 
> but at
> some point, doesn't the PCI bus become the choker?  I recall those big
> buffer boards that didn't seem to do much for performance.
>
> Stand-by for new 3Ware boards.  Don't know whether they will leverage
> on-drive TCQ, or will do it themselves though.
>
> Ken Meyer
>
>
> ----- Original Message -----
>
> From: Quentin Hartman <qhartman at lane.k12.or.us>
> To: <k12osn at redhat.com>
> Sent: Wednesday, February 18, 2004 11:18 AM
>
> Subject: RE: [K12OSN] new server serial ATA or SCSI
>
>
>> On Wed, 2004-02-18 at 08:34, Les Mikesell wrote:
>
>>> I haven't tested these myself but I think they still only accept a
> single
>>> command at a time.
>>
>> The new 73GB Raptors (but not the 36GB ones!) support the tagged 
>> command
>> queueing, so they are very SCSI-like in that respect. I've used these
>> drives in one of my client's machines and recommend them _highly_. 
>> They
>> are _fast_. And with a standard 5-year warranty, they are hard to 
>> beat.
>>
>> <snip>
>>
>>>  The big advantage of scsi is the ability of the controller to
>>> multiplex seeks across several drives at once.
>>
>> <snip>
>>
>> I'm not sure that I am addressing specifically what you are talking
>> about here, but it sounds like you are referring to ATA devices only
>> being able to access one device on a chain at a time, correct? In 
>> SATA,
>> this problem does not exist, each device is on a separate channel and
>> all can be accessed simultaneously. With the lower-end (read: onboard 
>> /
>> promise) chipsets, there is pretty significant CPU overhead though.
>> Better controllers from 3Ware are supposedly much better about this, 
>> but
>> I haven't seen any real benchmarks or had any hands on experience with
>> them, so it could be purely hearsay.
>>
>> --
>>    -Regards-
>>
>> -Quentin Hartman-
>>
>> Academic Computing and Networking Services Coordinator
>> Fern Ridge School District 28J
>> Elmira, OR
>> Office: 541-935-2253 x429
>> Cell: 541-914-2989
>> qhartman at lane.k12.or.us
>> www.fernridge.k12.or.us
>
>
>
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