12 Feb
2003
12 Feb
'03
9 a.m.
All,
Now that I inherited a nice set of StorageWorks enclusures with
an HSZ40C controller, I might as well use it, no? I plan on
connecting it to the primary file server of my "fun" network
(also known as VAXlab, aka pdp11.nl) so I'll have more (and safer)
storage there.
Only prob is.. the HSZ40C has a diff-scsi port, whereas the machines
have SE.
Is this easily converted with a cable, or will I be doing resistor-
balancing and/or use a signal converter box?
Thx,
Fred
12 Feb
12 Feb
9:43 a.m.
You would need a different SCSI card. Or perhaps a signal converter DWZZB
like thing (although you would be running the DWZZB in "reverse"). As you
probably know, the HSZ -> storage scsi is all SE, just the port back to
the host is differential.
On Wed, 12 Feb 2003, Fred N. van Kempen wrote:
All,
Now that I inherited a nice set of StorageWorks enclusures with
an HSZ40C controller, I might as well use it, no? I plan on
connecting it to the primary file server of my "fun" network
(also known as VAXlab, aka pdp11.nl) so I'll have more (and safer)
storage there.
Only prob is.. the HSZ40C has a diff-scsi port, whereas the machines
have SE.
Is this easily converted with a cable, or will I be doing resistor-
balancing and/or use a signal converter box?
Thx,
Fred
--
9:46 a.m.
As I understand it, its more than just a cable.. (Someone correct me if
I'm wrong)
Voltage/Signal levels are different.
David
On Wed, 2003-02-12 at 17:58, Fred N. van Kempen wrote:
All,
Now that I inherited a nice set of StorageWorks enclusures with
an HSZ40C controller, I might as well use it, no? I plan on
connecting it to the primary file server of my "fun" network
(also known as VAXlab, aka pdp11.nl) so I'll have more (and safer)
storage there.
Only prob is.. the HSZ40C has a diff-scsi port, whereas the machines
have SE.
Is this easily converted with a cable, or will I be doing resistor-
balancing and/or use a signal converter box?
Thx,
Fred
10:03 a.m.
That's correct.
http://scsifaq.paralan.com/scsifaqanswers.html#8
David Holland wrote:
As I understand it, its more than just a cable..
(Someone correct me if
I'm wrong)
Voltage/Signal levels are different.
David
On Wed, 2003-02-12 at 17:58, Fred N. van Kempen wrote:
--
---
-----
Alexander Stade 200 W. Jackson Blvd Suite 2300
Systems Administrator Chicago, IL 60606
TradeLink L.L.C. Phone - 312.264.2000 ext. 2027
alex(a)trdlnk.com Fax - 312.264.2001
All,
Now that I inherited a nice set of StorageWorks enclusures with
an HSZ40C controller, I might as well use it, no? I plan on
connecting it to the primary file server of my "fun" network
(also known as VAXlab, aka pdp11.nl) so I'll have more (and safer)
storage there.
Only prob is.. the HSZ40C has a diff-scsi port, whereas the machines
have SE.
Is this easily converted with a cable, or will I be doing resistor-
balancing and/or use a signal converter box?
Thx,
Fred
9:50 a.m.
On Wed, 12 Feb 2003, Fred N. van Kempen wrote:
All,
Now that I inherited a nice set of StorageWorks enclusures with
an HSZ40C controller, I might as well use it, no? I plan on
connecting it to the primary file server of my "fun" network
(also known as VAXlab, aka pdp11.nl) so I'll have more (and safer)
storage there.
Only prob is.. the HSZ40C has a diff-scsi port, whereas the machines
have SE.
Is this easily converted with a cable, or will I be doing resistor-
balancing and/or use a signal converter box?
It can't be done with just passive components.. ie you will need either a
differential<->single-ended converter or a differential SCSI card. If
you're using a machine that takes PCI cards, then a card will be cheaper,
but if you're using it with a VAX or PDP-11, etc, I'm doubtful you'll find
a differential-scsi interface, and will need to buy an interface box.
If you need/want a PCI wide/differential SCSI card, I have several Adaptec
AHA-3944AUWD's (with PC BIOS ROMs) that I would be willing to sell at a
'reasonable' price (probably $40 + shipping).
As far as 'converter boxes' go, I don't know what one would cost, because
I've never had to buy one.
Pat
--
Purdue Universtiy ITAP/RCS
Information Technology at Purdue
Research Computing and Storage
http://www-rcd.cc.purdue.edu
10:05 a.m.
Fred N. van Kempen wrote:
Only prob is.. the HSZ40C has a diff-scsi port,
whereas the machines
have SE.
Is this easily converted with a cable, or will I be doing resistor-
balancing and/or use a signal converter box?
You need a converter box. They're quite expensive new, but sometimes
can be found surplus for under $100.
11:29 a.m.
The DWZZB is a Storageworks building block component (in at least one of
its forms) intended to allow a diff scsi card to talk to a SE storageworks
shelf. I don't know if you can cable your VAX to the SE port of an empty
storageworks shelf and the HSZ to the differential end of the DWZZB and
have it work that way...I guess in theory it would work.
On Wed, 12 Feb 2003, Eric Smith wrote:
Fred N. van Kempen wrote:
--
Only prob is.. the HSZ40C has a diff-scsi port,
whereas the machines
have SE.
Is this easily converted with a cable, or will I be doing resistor-
balancing and/or use a signal converter box?
You need a converter box. They're quite expensive new, but sometimes
can be found surplus for under $100.
2:15 p.m.
Is the HSZ40C in a StorageWorks brick, or is it built into a tower? The
reason I'm asking is because my HSZ20 is a tower (with dual power
supplies in the back, not SBB bricks), and it has an internal DWZZB....
In other words, the port on the back of the enclosure is SCSI-diff, but
the host port on the controller, as well as the 2 disk channels are
single-ended. I was even contemplating pulling the DWZZB if I hadn't
found a PCI SCSI-diff card.
Stan
Fred N. van Kempen wrote:
All,
Now that I inherited a nice set of StorageWorks enclusures with
an HSZ40C controller, I might as well use it, no? I plan on
connecting it to the primary file server of my "fun" network
(also known as VAXlab, aka pdp11.nl) so I'll have more (and safer)
storage there.
Only prob is.. the HSZ40C has a diff-scsi port, whereas the machines
have SE.
Is this easily converted with a cable, or will I be doing resistor-
balancing and/or use a signal converter box?
Thx,
Fred
7:08 p.m.
On Wed, 12 Feb 2003, Fred N. van Kempen wrote:
All,
Only prob is.. the HSZ40C has a diff-scsi port,
whereas the machines
have SE.
Is this easily converted with a cable, or will I be doing resistor-
balancing and/or use a signal converter box?
Fred,
I have a couple of DEC Wide-FWD conversion modules. P/N DWZZA-VA
Look 'em up, and if that fits your bill, I'll send you one for
shipping costs.
Doc
13 Feb
13 Feb
12:47 a.m.
"Fred N. van Kempen" wrote:
All,
Now that I inherited a nice set of StorageWorks enclusures with
an HSZ40C controller, I might as well use it, no? I plan on
connecting it to the primary file server of my "fun" network
(also known as VAXlab, aka pdp11.nl) so I'll have more (and safer)
storage there.
Only prob is.. the HSZ40C has a diff-scsi port, whereas the machines
have SE.
Is this easily converted with a cable, or will I be doing resistor-
balancing and/or use a signal converter box?
Thx,
Fred
Fred ---
So, you have a machine with a SE SCSI port on it, right? Well, I have a
BA-350 Storageworks shelf available, with HD-50 SE SCSI connection. Your
RZ28s should work in it just fine.
It has 2 power supplies in it, but only one of the blowers on the back.
I haven't had a chance to test it out yet, but it yours if you like.
To All ---
If Fred doesn't want this shelf, someone else can buy it. Make me an
offer...
--
---Dave Woyciesjes
---ICQ# 905818
7936
days inactive
7937
days old
9 comments
9 participants
participants (9)
-
alex＠trdlnk.com -
dholland＠woh.rr.com -
doc＠mdrconsult.com -
dwoyciesjes＠comcast.net -
eric＠brouhaha.com -
Fred.van.Kempen＠microwalt.nl -
pat＠purdueriots.com -
pietstan＠rogers.com -
thompson＠new.rr.com