> >
> > I cannot ssh to SL6 machines from current MacOS or Debian 20 or 22:
>
> SL 6 is obsolete, maybe time to upgrade?
>


Looking on my list of SL6 machines:

experiment stations: dragon, musr, bnmr/bnqr, pol, titan. these are medium/small sized experiments,
all software updates must be coordinated with experiment people. each experiment station
has 2 or 3 SL6 computers (analysis station and VME frontend processor). install ubuntu 22.04,
rebuild all experiment software, make experiment work again. takes about 1 month of calendar
time per experiment station.

two twist computers: upgrade by turning them off, they only exist to run Absoft and Intel F90 compilers.

T2K/ND280 in Japan (JParc): update from SL5 recently completed.

DEAP dark matter search at SNOlab: running SL6 and will not be upgraded.

one former central server runs SL6 to run ruby-on-rails-based inventory database (does not work
on ubuntu). likely "upgrade" is move from physical machine to a VM. ("Just rewrite your inventory
database using the latest framework-du-jour!", "yessir! getting on it right away, sir!").

For some experiments, upgrade from CentOS-7 to Ubuntu 22 and upgrade from Ubuntu 20 to Ubuntu 22
has higher priority than upgrades from SL6.

So SL6 machines exist, they perform useful function, it takes a significant effort to upgrade
them (with no functional gain). In the mean time, nobody apprecates unnecessary rocking
the boat (breaking SSH, HTTPS, etc).


-- 
Konstantin Olchanski
Data Acquisition Systems: The Bytes Must Flow!
Email: olchansk-at-triumf-dot-ca
Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada