Architecture of Hera-B / Obelix
LAN segment
Hera-B / Obelix LAN segment is mainly a switched 10 Mbps ethernet
network. A switched 10 Mbps ethernet segment gives, every device,
full 10 Mbps bandwidth, while in a non-switched ethernet
segment (either 10Base-2 or 10Base-T) the 10 Mbps bandwidth is shared
by all the non-switched devices in the segment. In Hera-B / Obelix
LAN segment:
- 11 device (5 workstations, 3 X-terminals and 3 PCs), the older (and
slower) devices and the standalone PCs, are non-switched at 10 Mbps;
- 21 devices (8 workstations, 11 X-terminals and 2 print servers) are
switched at 10 Mbps;
- 1 device (HP K250 3-way Symmetric Multiprocessor Server) is switched
at 100 Mbps.
The switching hub (3Com SuperStack II Switch 1000) has 26 port:
- 24 10Base-T port, one of which connected to current backbone;
- 1 100Base-TX port dedicated to server link;
- 1 optional backbone port, for future use, that support either 100
Mbps (optical-fiber or twisted-pair cable) fast ethernet or 155
Mbps optical fiber ATM.
The main features of this architecture are:
- 100 Mbps HP K200 server bandwith is divided by 11 (10 Mbps) X-terminals,
so X-terminals may work on server at full speed;
- VMS alpha cluster is completely switched. Access to a remote disk only
involve the two lines connecting the switch to the machine owning the disk
and to the machine running the program; no traffic is routed in all other
lines;
- future backbone may be connect to the switch by mean of:
- 100Base-TX ethernet (100 Mbps, twisted-pair cable)
- 100Base-FX ethernet (100 Mbps, optical fiber)
- ATM OC-3c (155 Mbps, optical fiber)
PostScript
version
- Devices connected to 10Base-2 repeater:
- vs3obx (VaxStation 3100-M76/GPX, 0.29 GB HD on 8 Mbps SCSI-2)
- vs4bo2 (VaxStation 4000/90, 5.0 GB HD on 8 Mbps SCSI-2)
- vs4bo4 (VaxStation 4000/90, 3.5 GB HD, 10/20 GB DLT tape, and 1.2/2.5
GB Exabyte tape, all on 8 Mbps SCSI-2)
- vs4ox1 (VaxStation 4000/90, 3.7 GB HD and 10/20 GB DLT tape, both on
8 Mbps SCSI-2)
- ds5bo4 (DECStation 5000/150, 2.5 GB HD, 1.2/2.5 GB Exabyte tape, both
on 8 Mbps SCSI-2)
- pcobx (PC Compaq DeskPro 486/66, 3.1 GB HD on IDE)
- xwobx1 (X-terminal Digital VXT 2000)
- xwobx2 (X-terminal Digital VXT 2000)
- xwobx3 (X-terminal Digital VXT 2000)
- Devices connected to 10Base-T hub:
- pcobx1 (PC Texas Instruments, Pentium 75, 1.2 GB HD on IDE)
- pcobx2 (PC Texas Instruments, Pentium 75, 1.2 GB HD on IDE)
- Devices connected to 10Base-T switch port:
- hp7obx1 (WorkStation HP 9000/735/99, 6.0 GB HD on 20 Mbps SCSI Fast
& Wide, 4/8 GB DAT DDS tape on 8Mbps SCSI-2)
- hp7obx2 (WorkStation HP 9000/712/60, 1 GB HD on 8 Mbps SCSI-2)
- axobx1 (AlphaStation 200 4/166, 5.4 GB HD and 10/20 GB DLT tape, both
on 8 Mbps SCSI-2)
- axobx2 (AlphaStation 200 4/166, 0.97 GB HD on 8 Mbps SCSI-2)
- axobx3 (AlphaStation 255/300, 4.0 GB HD on 8 Mbps SCSI-2)
- axobx4 (AlphaStation 255/300, 4.0 GB HD on 8 Mbps SCSI-2)
- vs4bo5 (WorkStation DEC 3000/M600, 0.4 GB HD on 8 Mbps SCSI-2)
- vs4ox2 (WorkStation DEC 3000/M600, 6.5 GB HD on two 8 Mbps SCSI-2)
- xhphb1 (Color X-terminal HP Entria 10")
- xhphb2 (Color X-terminal HP Entria 10")
- xhphb3 (Color X-terminal HP Entria 10")
- xhphb4 (Color X-terminal HP Entria 10")
- xhphb5 (Color X-terminal HP Entria 10")
- xhphb6 (Color X-terminal HP Entria 10")
- xhphb7 (Color X-terminal HP Entria 10")
- xhphb8 (Color X-terminal HP Entria 10")
- xhphb9 (Color X-terminal HP Entria 10")
- xhphb10 (Color X-terminal HP Entria 10")
- xhphb11 (Color X-terminal HP Entria 10")
- lj5 (24pps Fast Duplex B/W Print Server, HP laserjet 5 Si MX)
- dj1200 (4pps Color Print Server, HP deskjet 1200 C/PS)
- Device connected to 100Base-TX switch port:
- hp8hb1 (Server HP 9000/800/K253, 3 CPU, 768 MB RAM, 20 GB HD on 20
Mbps SCSI Fast & Wide, 4/8 GB DAT DDS driver and 20/40 GB DLT driver
on 8 Mbps SCSI-2)
HERA-B
Bologna Home Page
May 31, 1997 Domenico
Galli