Two RAID 0 questions
Jeff Vian
jvian10 at charter.net
Wed Feb 25 23:35:42 UTC 2004
Alexander Dalloz wrote:
>Am Mi, den 25.02.2004 schrieb Allan Metts um 14:46:
>
>
>>At 05:29 AM 2/25/2004, Alexandre Oliva wrote:
>>
>>
>>
>>>Yes. IDE doesn't permit simultaneous access to disks on the same
>>>controller. Well, you could make do with two disks on a single
>>>controller, but performance would be terrible.
>>>
>>>
>>Okay, two IDE identical drives -- one will be the Master on the Primary
>>controller, the other will be the Master on the Secondary controller.
>>
>>Next question: Will it hurt anything to put the CDROM drive as the Slave on
>>the secondary controller? This is a no-no in the SCSI world, since I think
>>it slows the entire bus down to the speed of the slowest device. But I
>>need a CDROM to actually install Fedora, and I'd rather not buy an
>>additional controller....
>>
>>
With the newer scsi controllers it is possible to mix devices with
different speeds on the same bus.
>>Thanks for the help!
>>
>>Allan
>>
>>
>
>It's no problem to have a CD-ROM as slave together with a harddrive on
>the same controller. It will not slow down the whole controller.
>
>
>
Statement 1 is correct
Statement 2 is not. With IDE busses, all devices on the bus operate at
the speed of the slowest device. Thus if you put an ATA133 drive on a
bus with an ATA33 cdrom, the entire bus only operates at ATA33. They
are improving this, and AFAICT the new SATA controllers do not have this
limitation.
>Alexander
>
>
>
>
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