G/C/B/A-Series Overview of Fan Status Expectations

[FAQ_User]

Article ID: 15051

Products
G-Series
C5-Series, C3-Series, C2-Series
B5-Series, B3-Series, B2-Series
A4-Series, A2-Series

Goals
Expected failed fan status.
Expected normal fan status.

Solution
In the output of a 'show system' or 'show support' command, failed fans display as

"Not Operating"[1] -or- "Not Installed and/or Not Operating"[2] -or- "Installed and Not Operating"[3]

...and there will also be a "Fan x has failed." or "Unit x: Fan x has failed." or "Unit x Fan Group x failed" (5743, 10819) syslog item issued.

However, for the C3K models a fan status of "Not Installed and/or Not Operating" does not necessarily mean a fan has failed.
Further, by design not all fan grills are populated with a fan.

Outlined below are the fans installed in each of these products, along with what is normally expected in the fan-specific output of a 'show system' or 'show support'.

• The G3-Series (all models) has three fans installed, numbered 1, 2, and 3. There are only three fans displayed ("Fan Group 1-Status", "Fan Group 2-Status", "Fan Group 3-Status"). The C5-Series non-PoE 24-port models (C5G124-24, C5K125-24, C5K175-24) have two fan groups[4] installed, numbered 1 and 3. Group 1 contains fans 1, 2, and 3; and Group 3 contains fans 6 and 8; for a total of five fans. Both the "Fan Group 2-Status" and "Fan Group 4-Status" display as "Not Installed". One of the six fan grills on the right is always empty, so does not indicate hardware failure. The C5-Series non-PoE 48-port models (C5G124-48, C5K125-48) have two fangroups[4] installed, numbered 1 and 3. Group 1 contains fans 1, 2, and 3; and Group 3 contains fans 6, 7, and 8; for a total of six fans. Both the "Fan Group 2-Status" and "Fan Group 4-Status" display as "Not Installed". The C5-Series PoE models (C5G124-24P2, C5G124-48P2, C5K125-24P2, C5K125-48P2) have three fan groups[4] installed, numbered 1, 2, and 3. Group 1 contains fans 1, 2, and 3; Group 2 contains fans 4 and 5; and Group 3 contains fans 6, 7, and 8; for a total of eight fans. The "Fan Group 4-Status" displays as "Not Installed". The C3-Series 10-gigabit models (C3K122-24, C3K122-24P, C3K172-24) have three fans installed, numbered 1, 3, and 4. The "Fan Group 2-Status" displays as "Not Installed" (f/w 6.42.05.0001 and higher) or "Not Installed and/or Not Operating" (f/w 6.42.03.0004 and lower). A "Fan Group 2-Status" display of "Not Installed and/or Not Operating" is always a normal condition, so does not indicate hardware failure. The C3-Series other models have two fans installed, numbered 1 and 2. There are only two fans displayed ("Fan1-Status", "Fan2-Status"). The C2-Series (all models) has two fans installed, numbered 1 and 2. There are only two fans displayed ("Fan1-Status", "Fan2-Status"). The B5-Series non-PoE 24-port models (B5G124-24, B5K125-24) has two fangroups[4] installed, numbered 1 and 3. Group 1 contains fans 1, 2, and 3; and Group 3 contains fans 6 and 8; for a total of five fans. Both the "Fan Group 2-Status" and "Fan Group 4-Status" display as "Not Installed". One of the six fan grills on the right is always empty, so does not indicate hardware failure. The B5-Series other models have two fan groups[4] installed, numbered 1 and 3. Group 1 contains fans 1, 2, and 3; and Group 3 contains fans 6, 7, and 8; for a total of six fans. Both the "Fan Group 2-Status" and "Fan Group 4-Status" display as "Not Installed". The B3-Series (all models) has two fans installed, numbered 1 and 2. There are only two fans displayed ("Fan1-Status", "Fan2-Status"). The B2-Series (all models) has two fans installed, numbered 1 and 2. There are only two fans displayed ("Fan1-Status", "Fan2-Status"). The A4-Series (all models) has two fans installed, numbered 1 and 2. There are only two fans displayed ("Fan1-Status", "Fan2-Status"). Note: The A4H124-24 fans will either be off, at low speed, or at high speed, depending on environmental temperature. The A2-Series non-Poe 24-port models (A2H124-24, A2H124-24FX) have one fan installed, numbered 1. The "Fan2-Status" displays as "Not Installed". The A2-Series other models have two fans installed, numbered 1 and 2. There are only two fans displayed ("Fan1-Status", "Fan2-Status").

This is all Functions as Designed (FAD).
Contact the GTAC for assistance as necessary.

[1]Applies to G/C5/C3/B5/B3/A4 f/w 6.61.02.0007 and higher.
[2]Applies to G f/w 6.42.13.0002 and lower, C5 f/w 6.42.13.0002 and lower, C3 f/w 1.01.01.0039 through 6.42.13.0002, C2 f/w 5.00.28 and higher, B5 f/w 6.42.13.0002 and lower, B3 f/w 1.01.01.0039 through 6.42.13.0002, B2 f/w 4.00.22 and higher, A4 f/w 3.03.04.0003 and lower, and A2 f/w 1.04.12 and higher.
[3]Applies to C3 f/w 1.00.98 and lower, C2 f/w 4.00.55 and lower, B3 f/w 1.00.92 and lower, B2 f/w 3.01.27 and lower, and A2 f/w 1.03.24 and lower.
[4]The C5/B5 fan group organization is as follows, from the perspective of a user facing the front panel:

There are six fan grills on the right-hand side, with not all of them used by all models: Fan Group 1 is located on the rear of the right-hand side, and contains fans 1 (rear-most), 2, and 3. Fan Group 3 is located on the front of the right-hand side, and contains fans 8, 7, and 6 (front-most).
• There are six fan grills on the left-hand side, unused by most switch models: Fan Group 2 is located on the rear of the left-hand side, and contains fans 4 (rear-most), unused, and 5. Fan Group 4 is located on the front of the left-hand side, and contains unused fan grills 9, 10, and 11 (front-most).