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[armaniexchange]

Hi all,

I noticed my dns 323 has the system fan regularly on. It does spin down once in a while, but gets up not long after. Under the status page, the temperature shows 44 degrees. I'm aware that this is normal temperature. But why is that the fan comes on so often then?

I read somemore that the system turn off Fan when the temperature reached 43 degress Celcius : 43(OFF), 46(LOW), 49(HIGH).

[jesbo09]

Are your disks set to spin down after a period of inactivity?  If not, the disks will generate heat and the fan will cycle on/off as the temperature fluctuates up/down.

I have my disks shut off after 5 minutes of inactivity.  After they shut down and cool, the fan stops and stays off until the disks spin back up and the temp rises again.

[armaniexchange]

hey my disk are never set to spin down cause it always get spin up again for no reason. Thus i just leave it on. But the funny thing is even if im not accessing it, the fan will still turn on.

[jesbo09]

Yes...  As long as the disks are spinning, they generate heat.  The disk motors are actually where most of the heat comes from.  So the fan will come on to pull off some of that heat, then cut off until the heat builds back up.  The only way to have the fan off and stay off is to use energy saving disks (like the WD Caviar Green) and/or have them spin down when not active.  Thats just the way it is.

[armaniexchange]

hmm im actually using wd 1tb green. seems like it still does generate heat. haha. but noise level is pretty silent. actually i had rather leaving it on den putting it on power management.

[jesbo09]

I suspect even the WD Green Drives, when spinning but idle do generate enough heat to trigger the fan periodically.  The DNS really doesn't have any ventilation without the fan, so heat will build up.

[armaniexchange]

yea it does generate heat when idel too. anyway u leave your unit 24 hrs? i only worry it collects more dust at the vents.

[jesbo09]

I do..  24x7... However, by setting the drives to spin down after an idle period, it shuts down and the fan stops.  So its essentially asleep at night.  My drives do NOT wake up periodically so I'm not sure what is causing your to do that, other than perhaps you are running one of the server services that I don't.  I basically enable file server (samba) and thats it... No iTunes server, printer, etc.

I have heard that if by chance you have any data in the lpr queue to print, the DNS will wake up the disks periodically to try to print the job.  If you purge the print queue, the disks may spin down and remain that way till accessed.  I can't confirm this, because I don't use the print server, and in fact "kill" the lpr task when I boot up.

[armaniexchange]

i too dont run other services other den ftp server. i actually gave up on finding what cause it to wake up by itself. and yes jobs waiting to be printed can indeed wake it up. but i have none of these enabled.