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SCSI controller NCR53C94
The VAX 4000 and MicroVAX 3100 have an NCR53C94 SCSI controller onboard for support of different types of SCSI devices including disks and tapes. Optionally a second controller can be added.
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VAX 6620 through VAX6660 models emulate 2-6 CPUs respectively. In this situation, loading of the host system can be tuned with the following configuration file settings:
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affinity
This setting binds the running instance of the emulator CPUs to particular host CPUs. This should be used for soft partitioning host CPU resources or for isolating multiple CHARON instances on the same host from each other.
By default the emulator instance allocates as many host CPUs as possible.
“Affinity” overrides the default and allows explicit specification of which host CPUs will be used by the instance. Affinity does not reserve the CPU for exclusive use.
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Example:
set session affinity = | ”0"0, 2, 4, | 6”6" |
n_of_io_cpus
Reserves host CPUs (of those specified by “affinity” parameter, if any) for use by the emulator for I/O handling.
By default the emulator instance reserves one third of available host CPUs for I/O processing (round down, at least one).
The “n_of_io_cpus” overrides the default by specifying the number of I/O host CPUs explicitly.
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Example:
set session n_of_io_cpus = 2 |
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