[HPADM] SUMMARY: Fibre Channel Question
From: Quinn, Bryan (Bryan.Quinn_at_CooperTools.com)
Date: 05/14/03
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To: "'hpux-admin@dutchworks.nl'" <hpux-admin@dutchworks.nl> Date: Wed, 14 May 2003 09:47:32 -0400
Thanks to everyone who responded. Here are the responses I got from Jack
Gallagher and Jim Turner, they gave me the info I needed. Basically the FC
connection is from the server to the library, where it is then converted to
a SCSI to the actual drives via a FC/SCSI bridge. It was the consensus that
I should be able to run two drives off of one FC connection at approximately
100MB/sec. This is exactly the info I was looking for!
Thanks again!
Below are Jack's and Jim's responses.
-Bryan
Jack Gallagher wrote:
I think you would use a FC to SCSI bridge to connect
the DLT's in which case each would have it's own address.
Jack Gallagher
Jim Turner wrote:
Hi Bryan,
As a general rule, we have always put two tape drives per 1Gb FC. Even with
our newest libraries, the FC still gets converted to two channels of SCSI
for connection to the drives. The FC/SCSI bridge is a card in the library,
so it "looks like" the library runs on FC when in fact the drives are still
SCSI. When you subtract protocol overhead and SCSI encapsulation costs from
1Gb/sec FC, you can achieve about 100MB/sec which should run two drives
comfortably.
Cheers,
Jim
ORIGINAL POST:
Hello Admins,
I have a pretty simple question. We currently have a DLT library attached to
two V-2600's. The library has 6 drives, and is SCSI attached. That being the
case, each drive has it's own SCSI connection to the server. So my question
is if we switched from our current library to a library with Fibre Channel
connection and made the neccesary changes to the V's, how many fibre channel
connections would we have? Would it still be one connection per drive? I am
not familiar with Fibre Channel and am just trying to understand how the
connections work.
Thanks,
Bryan Douglas Quinn
UNIX Support Specialist
Cooper Tools - Lexington, SC
803.808.6770
bryan.quinn@coopertools.com
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