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Presently (end November 1993), around two thirds of
VXCERN users are still on
VXCRNA, with the remainder using the Alpha machines. Measurements
of the interactive trivial response time on the Alpha machines
as a function of the number of concurrent interactive users show
that performance is still very good on each machine at least up
to a limit of 70 simultaneous sessions. The Table below
(
) shows
the data for the Alpha workstations and for the VAX 9000. The
figures given are the average times to complete a series of
trivial commands in a dcl script. Data were collected
continuously over a period of several weeks. Errors on these data are
typically around 10
current configuration, the 9000 is serving the disks to the rest of
the Cluster.
We thus expect good response in the right-sized VXCERN cluster for a total of at least 4*70 = 280 interactive users, compared with very poor response on the VAX 9000 with 250 simultaneous users today.
