Temperature

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The first consideration is the location of the server

  • Keep away from direct sunlight
  • There should be a minimum of 5cm on all sides
  • Avoid placement in areas of excessive heat
  • Avoid high humidity
  • Ensure the environment is clean
  • Do not place on the floor
    •

The GEM has a number of temperature sensors and alarms.

Disk Caddy Thermocouple
Each GEM disk caddy has a thermocouple situated near the cooling fan. This temperature is monitored and is set to sound a loud audible alarm at 50°C. This can in principle be changed with the front controls on each disk, however 50°C is what the disk manufacturers state as maximum.

Disk Internal Thermocouple - Backup Disk
Each disk has an internal thermocouple, measuring internal disk temperature. For the backup disk, this temperature is shown (among many other things) at the bottom of the 'Mirror Disk Information'.
Log in to the server > System > Z1 Backup Control > Show Mirror Disk Information
For example you will then see something like:
194 Temperature_Celsius  0x0002  137  137  000  Old_age  Always  - 35 (Lifetime Min/Max 18/43)
Indicating a current temperature of 35°C with the minimum and maximum temperatures recorded over the lifetime of the disk. The current temperature should be within a few degrees of that indicated on the front panel.

Disk Internal Thermocouple - Main Disk
In order to see the value for the main disk enter:
smartctl -A /dev/hda
as a linux command. This can be done from a command line interface, or:
Log in to the server > System > Run System Command

CPU Temperature
The CPU temperature is displayed when you look at the Server Status display in the WEB interface (only on GEMs). Log in to the server and click 'Server Status' at the top right of the screen. This is usually between 25°C and 30°C when the GEM is idle and  goes to anywhere between 40°C and 50°C when the CPU is busy. The maximum permissible temperature is 84°C and the GEM will stop if it reaches this.

Note
The command
smartctl -A /dev/hdc
will show the temperature for the backup disk
On some old Z1s 'hda' and 'hdc' should be replaced by 'hde' and 'hdg' respectively and CPU temperature is not measured on all Z1s - just on Z1 GEM.

What to do if you are concerned that your server may be overheating

  • Check the location as above
  • If the location meets the above and no vents are blocked then contact Zybert support
  • The case should never be opened with power on
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