When you insert a card that needs more than 75cfm, the fan will be
switched from restricted-power to full-power by the IOS software.
I'm starting to believe there are different FAN-MOD-4HS out there, and
some of them only support 75cfm per slot
(300cfm in total) vs. those that also support 94cfm per slot in full
power mode (which you need for the X6708-10G-3CXL).
Might be worth trying a newer hardware revision of the FAN-MOD-4HS.
Chris
Am 21.03.14 11:31, schrieb Lobo:
Wow I never knew about that switch. Ours had the variable and full
options and we moved it over to full. The fan is definitely running at
the higher speeds but I think there's a problem with the reporting.
The router still can't get the proper information from the fan module
so it still thinks it's operating at 75 cfm. Reboots don't help it at
all and so the 6708 still thinks it doesn't have enough cooling
capacity to start it up.
My colleague made an interesting observation and that is that prior to
inserting the X6708-10G-3C card the fan was operating correctly and
reporting everything like this:
fan-tray 1:
fan-tray 1 type: FAN-MOD-4HS
fan-tray 1 mode: Restricted-power
fan-tray 1 fan-fail: OK
chassis per slot cooling capacity: 75 cfm
Once the 6708 card is inserted, the fan module almost seems like it
loses it's ROM information or something because it then reports like
this:
fan-tray 1:
fan-tray 1 type:
fan-tray 1 fan-fail: OK
chassis per slot cooling capacity: 70 cfm
This has happened twice now (once in the field and once in our lab).
I'm wondering if the insertion is somehow affecting the fan module?
Jose
On 3/21/2014 10:40 AM, Tim Durack wrote:
This might help you:
In the Cisco 6504 E, on the FAN-MOD-4HS fan-tray there is a switch at
the rear. This switch should be in the "A" position. See Figure 2.1.1.
This allows the fan to run in high-power mode. In this mode it
generates an airflow of 100 ft3/min per slot.
When the switch is in the "M" position it operates in the
restricted-power mode and generates only 75 ft3/min per slot. The
WS-X6716-10GE line card has a cooling requirement of 84 ft3/min. In
this case it could prevent the line card from powering up.
Note: on another FAN-MOD-4HS fan-tray the positions of the switch are
labeled "VARIABLE" and "FULL". The switch should be put in the
"VARIABLE" position.
On Fri, Mar 21, 2014 at 9:49 AM, Lobo <loboti...@gmail.com
<mailto:loboti...@gmail.com>> wrote:
Agreed. But even after a reboot, the chassis is still not
allowing this 6708 card to come up because it complains about
insufficient cooling.
This is pretty annoying as their documentation shows that the 7604
is compatible with this card but now we're starting to wonder if
that's truly the case.
Jose
On 3/21/2014 9:42 AM, Phil Mayers wrote:
On 21/03/14 12:15, Lobo wrote:
Even though the cards are not completely compatible for
totals # of
routes (3C vs 3CXL) the system should default to the
lowest card but I
would think that it would still power up the card and let
it function
normally.
No; the PFC/DFCs must all match. The other PFC/DFC need to be
*downgraded* to non-XL mode, and that need a chassis reboot.
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