Wired Intelligent Edge

Hi,

running  DL.10.13.1060 (Aruba CX 10000-48Y6C) we see quite high values for Fan speeds, i.e. from one switch today:

Fan information
------------------------------------------------------------------------------
Location-      Product  Serial Number  Speed   Direction      Status  RPM
Mbr/Slot/Fan   Name
------------------------------------------------------------------------------
PSU-1/1/1      N/A      N/A            N/A     back-to-front  ok      5640
PSU-1/2/1      N/A      N/A            N/A     back-to-front  ok      5728
Tray-1/1/1     N/A      N/A            normal  back-to-front  ok      20849
Tray-1/1/2     N/A      N/A            normal  back-to-front  ok      18060
Tray-1/2/1     N/A      N/A            normal  back-to-front  ok      20849
Tray-1/2/2     N/A      N/A            normal  back-to-front  ok      17880
Tray-1/3/1     N/A      N/A            normal  back-to-front  ok      20849
Tray-1/3/2     N/A      N/A            normal  back-to-front  ok      18120
Tray-1/4/1     N/A      N/A            normal  back-to-front  ok      21093
Tray-1/4/2     N/A      N/A            normal  back-to-front  ok      18120
Tray-1/5/1     N/A      N/A            normal  back-to-front  ok      21011
Tray-1/5/2     N/A      N/A            normal  back-to-front  ok      18060
Tray-1/6/1     N/A      N/A            normal  back-to-front  ok      21343
Tray-1/6/2     N/A      N/A            normal  back-to-front  ok      18243

Are these real speed values for RPM? It says normal for all trays. Then, what are the maximal numbers we can still accept and not be worried? Are those RPM values realistic, or something is just reported wrongly? They seem to me quite crazy for a "normal" operation in an environmentally well equipped datacenter.

Thx,

Miro.

Miro.

Hi! if the output of show environment fan command isn't showing you anything abnormal (thus all ready) and Fan LED status are Green then those speeds - despite quite high if compared to what we could be normally used to - could be reasonable or "by design" for normal operating condition in a correctly cooled datacenter [*] Did you eventually check if - maybe - there is anything related to Fan Modules on Aruba CX 10.13.1090 for Aruba CX 10000?

Edit: to be honest I checked on Aruba CX 8360 with Fans reporting "slow" speed and the RPMs are about 6.6k/7k (downstream/upstream)...so maybe Aruba CX 10000 uses quite different Fan Units or the environment it is running on is warmer (and so Fans need to push more to cool)...could it be?

[*] I wrote that looking at technical data of a Fan Module I know - made of an upstream fan tied in series to a downstream fan, so two fans coupled in a single Fan unit Port-to-Power (the reverse in case of Power-to-Port) - of a similar Aruba CX 8360 switch...I then see 20k/23k RPMs on normal operation with che upstream fan pushing 3k RPMs more than the downstream one...so, comparing with your values, if Aruba CX 100000 Fans Units are similar to ones used by Aruba CX 8360 then they are not running exactly at their maximum possible RPMs (18/20k vs 20/23k RPMs). Something like this.

Thx,

this is a reasonable explanation. I have also discussed this with one of my storage colleagues, even certain SAN switches are able to reach very high RPM values running at 100% speed.

The point is, I'm not worried anymore.

Miro.