The SCSI-PMON is a family of low cost performance monitors for the SCSI bus.
Being plugged onto the cable like a normal device they monitor the usage of the bus and report statistics to a host every second via a serial connection. Up to more than a hundred slave devices can be daisy chained to a master module allowing synchronized readings on many busses. This feature is particulary useful for the modern RAID controllers to monitor the output busses and the input bus concurrently. By this the system manager gets valuable information about the real load on the SCSI-busses; information that before could be gathered with expensive and hard to use SCSI-Analyzers only.
Both families use a master/slave concept where one master module provides all the timing and control for all the slaves. The master also reads all the slaves, converts their raw (binary) data to ASCII and sends it via a UART to the host. Each slave monitors one bus and measures the four key parameters of it. To ease the usage each master module houses one (the first) slave in the same box.
Technical Data : SCSI-PMON-T Common Data
|Report format||percent of one second, ASCII|
|Serial line||9600 Baud, 8 bit, no parity, 1 stop bit|
|Counters||4 (FREE, OVERHEAD, DATA IN, DATA OUT)|
|Cascadability||>16 devices (except - SA devices)|
|Bus speeds||FAST, ULTRA-FAST|
|Bus widths||8/16 bit|
|Used device ID||none (absolutly passive on SCSI bus)|
The basic core module gets a bus specific buffer interface to adapt to the single-ended or differential version of the SCSI-bus. There are modules that are connected to the bus like a device or are inserted into the cable. All types of slave modules can be combined with all other types of slaves (of the same family e.g. SCSI-PMON-T) and with all master modules of the same family.
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