HERA-B VME/LynxOs Online Cluster
under construction and revision
Purpose of System
- VME CPU's (crate controller - CC) are the backbone of the
HERA-B DAQ system
- tasks: monitoring, configuration slow- and run control
- online/daq software development platform
- operation and control of experiment
System Overview
The HERA-B VME cluster consists of approx. 100 diskless VME CPUs
(Crate Controllers): hb-vme01, hb-vme02, ...., hb-vme99.
All VME CPUs are built by CETIA and operated under LynxOs.
They have PowerPC processor (either a 601 with 100 MHZ, 604 with 150MHz or
604e with 200/300 MHz), with 32 MB or 64 MB memory on board,
10Base or 100Base ethernet interfaces, serial line and scsi interfaces.
- LynxOs 2.3: hb-vme01 - hb-vme20
- LynxOs 2.5: hb-vme21, ... (PPC604E - 200MHz/300MHz)
The boot server - and NFS-homedirectory server is located on the on the
hblynxs machine, a dual processor Pentium machine 466MHz operated under
Linux.
Together with several other Linux machines (approx 20)
a NFS cluster is setup with common users, passwords and disks on all machines.
A list of Linux machines:
- hblynxs : main server, dual processor
machine 466MHz, 384 MB RAM
- hbols1 : dual processor machine
466 MHz, 384 MB Ram - data disk server
and main working horse
- hbcon01x : external boot server
for vme cpus outside of the west hall - no general login machine
- hb-con01 : P200 with new Linux version
- hb-con02, hb-con03, hb-con05, hb-con06,
hb-con07 older machines P66, P100, P133 - mainly used
as terminals
- hb-con04, hb-con14 used
exclusivly by HERA-B Target group
- hb-con09, hb-con11 andf hb-con12
VDS, Target and general login
- old hb-linux, hb-lynx, hb-disk1 - not yet back
The vme home directories are accessible from the online Linux machines
under: /home/Lynx/C604/Home/ - for LynxOs 2.3 (sim. to /OldHome)
and: /home/Lynx/C604b/Home/ - for LynxOs 2.5
A memo was posted after the upgrade (18.Jan. 00) Memo:
Upgrade of Online Linux Cluster
User Support / FAQ /Docs
- If you need an account, in case of questions
or if you want to mount disks from other computers, send an email:
Klaus Ehret
- the reference password file is kept on the hblynxs,
there exists now an automatic
update procedure
- old decription of Linux Cluster:
Online Linux Cluster
- LynxOs manuals are available in building 66 (K.Ehret) and
building 61 (???)
- automatic backups and recovery of lost files : cp.
Online Linux Cluster Docu: FAQ)
- Memo (May 1998) for the test phase and migration from Lynx2.3 to
Lynx 2.5
Usage of new VME-CPUs
- introduction to recover a broken system:
Broken disk - Help and info
Machine Overview / Usage
You can have a look on a detailed overview of the:
VME-CPUs: list by M.Bathe 1999
VME-CPUs: updated list by K.Ehret - ordered
according usage by subgroups
bootpfile of installed VME CPUs
Documentation