Acer Altos S300, User Manual

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4 System monitoring 36
Environmental status (ES) block
A fully configured Altos S300 series enclosure will include two ES
blocks, one located on each I/O Module. Each ES block will
continuously monitor the enclosure. If the enclosure is configured as a
single (or joined) SCSI bus, one ES block will act as a master and will
have the responsibility of reporting enclosure information via the SCSI
bus and performing all functions for the enclosure. If the other ES
block detects the loss of the master ES block then it will assume
responsibility for reporting and control.
In a dual (or split) SCSI bus configuration, each ES block will report
enclosure information over the SCSI bus to which it is physically
connected.
Features
The ES block built into the ESM, CSM and TSM has the following
features:
• Monitoring/control for 14 SCSI disk drives.
• Control over one bi-color LED for each disk drive carrier.
• Monitoring/control for 2 power supplies and 4 fans (2 per ACM).
• Control of 3 Front Panel system LEDs, to indicate module failure,
split/join mode and power.
• Reports status and receives control information via the SCSI bus.
• Microcontroller for data processing, control, and communications.
• Volatile and non-volatile memory for the microcontroller.
1
2
1
2
0 I 0
I
I/O Module
I/O Module
Mute
The I/O Modules can be inserted into either I/O slot
The I/O Modules can be inserted into either I/O slot.