[CentOS] HA Storage Cookbook?

Gordon McLellan gordonthree at gmail.com
Fri Nov 7 18:10:07 UTC 2008


Reading the datasheet, my interpretation is Seagate has taken a ide
drive chassis (7200rpm, PMR, slow seek times, etc) and added a SAS
interface board.  They mention the sas version offers improved
performance over the sata version, and also the sas version supports a
dual-port interface.  Other more expensive SAS drives take a scsi
drive chassis (10-15krpm, GMR, fast seek times) and add the SAS
interface board.

I guess I'm saying, if you interpret the name "Serial Attached Scsi"
literally, then the Seagate ES.2 is not an SAS drive - it is not a
scsi drive with a serial interface.  However, if you interpret SAS as
an interface standard, then the interface board determines what the
drive is, more so than its mechanical construction.

-Gordon

On Fri, Nov 7, 2008 at 12:16 PM, Jerry Franz <jfranz at freerun.com> wrote:
> Steve Thompson wrote:
>>
>> On Fri, 7 Nov 2008, Gordon McLellan wrote:
>>
>>> I meant SAS; specifically Seagate Barracuda ES.2 drives.  Here's a
>>> tiny version of their huge url:
>>>
>>> http://tiny.cc/3X9fI
>>>
>>> No, they are not the super fast and expensive 15krpm database drives.
>>
>> Indeed. They're not SAS either.
>
> From the manufacturer's page: "Barracuda ES.2 SAS 3.0-Gb/s 1-TB Hard Drive"
>
> Sure sounds like SAS to me. What leads you to believe they are not being
> truthful?
>
> --
> Benjamin Franz
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