Our hw config just completed.
hosts <-> 16 Port Fibre switch <-{long wave GBIG}-> 10.3Km <-{LWG}-> MDR <->
Tape Lib.
Verified, host sees Tape Lib.
One word of CAUTION.
The fibre unit MUST go to port 1 on MDR
4 port SCSI to port 2
4 port SCSI to port 3
Management Module to port 4
No other config of MDR will work.
-----
Corrections
"These GBICS are more expensive than single mode" should be
"These GBICS are more expensive than the normal, multi mode GBICS"
-----Original Message-----
From: Hannes Visagie
Sent: Thursday, November 08, 2001 8:29 AM
To: tru64-unix-managers_at_ornl.gov
Subject: Summary: Max length of fibre
Hi All
Sorry for late summary, but just back from evaluating backup solutions.
Long wave GBICS and single mode (dark fibre) will work. These GBICS are =
more
expensive than single mode. They are certified up to 10 km but can go =
to 100
km in some configurations.
Here are the replies, thanks to all.
--- Leonard, Nick ---
Long wave GBICS and single mode (dark fibre) expensive but will work
--- Davis, Alan ---
9-micron long wave single-mode optical fibre cables may be used for
inter-switch links up to 10km. This is conservative, going by a doc on =
the
website. I seem to remember seeing numbers like 70km total fabric length =
for
the latest releases, but that assumes that you are cascading switches no
more than 10km apart. It's also possible to use a FC/ATM bridge to =
extend
the link at the cost of adding latency.
--- Robert Sandford ---
Compaq have GBIC modules that will support distances up to 100 =
kilometers
(about 60 miles). Compaq SANworks call this "Very Long Distance GBIC"
which operates at 1062.5 megabits per second over 9-micron, single-mode
fiber.
--- Greg Freemyer ---
The long waves can definitely go that far. (10 Km currently supported, =
and I
think up to 100 Km in some circumstances.)
The long wave requires 9 micron fibre, and it REQUIRES a switch at each =
end.
(i.e. very expensive)
I believe there is one exception to the switch at each end rule. (and =
you
qualify.)
If you have a remote backup system, you can use a hub at each end. =
(Hubs are
a lot cheaper than switches.)
I don't know if they officially support a "switch - long wave - hub" =
solution
or not. I would expect it to work, but support is important to most =
people.
The main thing to realize is Compaq does NOT support long-wave directly =
into
a server or a storage/tape system.
--- Vlack, Jay from Compaq ---
You are correct. Multi-mode Fibre Channel optical cables should be used
with shortwave GBIC modules, and the cable should be 500m or less in
length. Single-mode Fibre Channel optical cables are used with longwave
GBIC modules, and the cable length can be up to 10km.
---
That's all folks
-----Original Message-----
From: Hannes Visagie
Sent: Friday, November 02, 2001 10:20 AM
To: tru64-unix-managers_at_ornl.gov
Subject: Max length of fibre
Hi All
We are investigating a new backup solution. I need to determine if we =
can
move out tape library offsite.
16 Port fibre switch to MDR {Fibre to SCSI} to Tape library.
AFAIK the short-wave GIBIC's can only do 500m.
long wave or other solution ?
We need about 5 Km. No problem with our Extreme TCP/IP net.
Thanks
Hannes
Received on Thu Feb 07 2002 - 13:21:48 NZDT