14 Dec
2001
14 Dec
'01
1:25 p.m.
-----Original Message-----
From: Jochen Kunz [mailto:jkunz@unixag-kl.fh-kl.de]
On 2001.12.14 18:08 Christopher Smith wrote:
[Sequent Symmetry S81]
Possibly, it's hard to tell since I'm not sure what an SMD interface looks
like. I could turn it over and check but I don't know what to look for. ;)
Drives, but I can probably handle that...
What interface SMD? I believe that
the system was board-for-board compatible
with the S27,
The Unix-AG once owned a S27 with 8 CPUs, 80MB RAM, 7 SMD disks,
Exabyte, ... I know where the machine is now, including a complete set
of OS software. If you get the machine working, ask me for software. Don't expect much of that machine. I could get
only 200kB/s via the
Ethernet, the SMD disk controller could not handle more then 700kB/s.
(The same disks can deliver more than 2MB/s on a Sun 3/260.) That is
real poor for such a high end beast. I was really
disapointed. But it is
Did you get the chance to find out how performance faired when you add more
CPU?
nice to see an old 4.2BSD UNIX derivate with AT&T
universe
running on 8
CPUs in a SMP config.
It is amusing for me to see _any_ intel cpu running in an SMP config, and
the fact that from what I've heard, Sequent made them do it fairly well,
intrigues me.
Regards,
Chris
Christopher Smith, Perl Developer
Amdocs - Champaign, IL
/usr/bin/perl -e '
print((~"\x95\xc4\xe3"^"Just Another Perl
Hacker.")."\x08!\n");
'
16 Dec
16 Dec
5 a.m.
On 14 Dec, Christopher Smith wrote:
Possibly, it's hard to tell since I'm not sure what an SMD
interface looks
like. I could turn it over and check but I don't know what to look for. ;) We
had a dual channel SMD controller. There was a big ribbon cable from
the CPU cabinet to the disk cabinet. In the top of the disk cabinet was
some kind of distribution PCB with the standard 60 and 26 pin SMD
connectors. Normaly there is one 60 ribbon cable per bus that goes to
all drives (much like SCSI) and one 26 pin ribbon cable per drive to
the controller. Sequent did somthing different. There was a separate 60
cable to each drive.
Drives, but I can probably handle that...
What
interface SMD? Did you get the chance to find out how performance
faired when you add more
CPU?
I did nerver change the CPU config and we never really used the system.
To much heat in our litle room. ;-)
It is amusing for me to see _any_ intel cpu running in
an SMP config, and
the fact that from what I've heard, Sequent made them do it fairly well,
intrigues me.
They may have done the SMP part well, but as I wrote the IO
performace
is poor. I could not belive what I measured. But one of the former
administrators confirmed that IO was real slow.
--
tschuess,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz
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