Re: SCSI/IDE and RAID [Was: 120 gb is the Largest hard drive I can put in my 4550?]

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#307

From: Cristian Croitoru
Date: Sat, 06 Dec 2003 23:16

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"derek / nul" <abuseonly@sgrail.org> :
> Let me say that all drives on a controller can be reading and writing at
the
> same time, this does not mean that they are holding onto the buss at that
time.
>
> Buss speed 160Mb/s, drive speed 20Mb/s  therefore 8 devices r/w at the
same
> time.
>
> All drives have buffers (double buffers actually), when a buffer is full,
the
> drive raises a flag (data available) to say he wants to transfer some
data, when
> the buss is free there will be a buss available signal.
>
> In effect we have a multiplexed system happening here, unlike an IDE
device
> which holds the buss for the complete transfer.

Now I am really confused.. 20 Mb/s sounds measly, IDE drives can burst 100+
(150 on SATA) and they DO that, cause I tested.. Also they can supply
sustained at 50 MB+ and they do that, measured from the speed of "ghosting"
a drive on an other one.

While I understand the concept of multiplexing, it seems to me that the
numbers you presented do not quite add up..

I am looking forward for the approval of my new server, it should have
enough "variety" to be able to demonstrate proof on concept and benchmarking
for the technology in discussion.. Again, I hope I do not screw up - grin

Cristian Croitoru

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From: "Cristian Croitoru" <c_croitoru@hotmail.com>
Newsgroups: alt.sys.pc-clone.dell,aus.computers
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Subject: Re: SCSI/IDE and RAID [Was: 120 gb is the Largest hard drive I can put in my 4550?]
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