The SYSTAT 132 motherboard contains a thermistor (thermal resistor) located near the voltage regulator module. When the ambient internal temperature exceeds 85° Celsius (185° Fahrenheit) , the system logic interprets this as "Hot" and does one of two things:
Due to poor ventilation or high ambient room temperature, the aluminum casing of the SYSTAT 132 can reach surface temperatures of over 70°C. Operators use "hot" colloquially to describe a unit that cannot be touched without heat-resistant gloves. This usually precedes an internal failure.
In hot mode, processes with high CPU or I/O jump to the top, and the list refreshes faster than standard systat. systat 132 hot
This is where systat 132 hot shines. Under hot, each disk’s transfer rate (tps), kilobytes per second (kps), and queue length refresh instantly. You can literally watch a tar command appear as a green or white bar shooting across the disk column.
systat allows live switching of views without restarting: The SYSTAT 132 motherboard contains a thermistor (thermal
From hot mode, type : iostat and press Enter. Type : hot to return.
$ systat 132 hot
Your screen clears, and a dense table appears. You press : and then disk to focus on I/O. Suddenly, the da0 (disk) column jumps from 5% busy to 98% busy. The wait CPU column jumps to 40%. From hot mode, type : iostat and press Enter
You know instantly: It’s not the CPU. It’s the disk.
You kill the backup job, and within two refreshes (two seconds), the hot display drops back to idle.
Note: Not all Unix-like systems include
systat. It’s common on BSD (FreeBSD, OpenBSD) and old Solaris. On Linux, installsysstator usetop/htopinstead — butsystat’s layout is unique.
Do not simply "disable the alarm." Power off the unit for 30 minutes. This allows the thermal mass of the chassis to dissipate.