I was just wondering if you all use STP in your server rooms.
We have been using UTP, but recently I have been getting
'carrier errors' on interfaces in one rack. After changing the cables to
longer coiled UTP cables and tucking the excess in the between the server and
rack, carrier errors increased. All the servers that have their coils in between the
rack wall and the servers
are getting 'carrier' type errors. Could this be EMI noise from inside the server rack
?
We have a Symettra RM APC UPS at the bottom of the stack with 2 different versions of
firmware
on the power modules, which may be causing part of the problem.
The server rack has both metal doors on it. The IBM metal racks have thousands of tiny
holes in the metal
front an rear doors for air flow, so I thought EMI could not get in from outside metal
rack.
Top of server rack:
--------------------
Linux server1 2.4.18 #1 Mon Aug 5 11:14:32 EDT 2002 i686 unknown
eepro100 16720 1
[EMAIL PROTECTED]:~$ /sbin/ifconfig
eth0 Link encap:Ethernet HWaddr 00:02:55:FA:92:A3
inet addr:192.146.226.40 Bcast:192.146.226.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:183594349 errors:0 dropped:0 overruns:0 frame:0
TX packets:61284517 errors:0 dropped:0 overruns:129 carrier:47474
collisions:113798 txqueuelen:100
RX bytes:3302832071 (3.0 GiB) TX bytes:3659840402 (3.4 GiB)
Interrupt:10 Base address:0x4000
[EMAIL PROTECTED]:~$ uptime
11:47:05 up 125 days, 15:35, 1 user, load average: 0.00, 0.02, 0.00
one down:
--------------------
Linux server2 2.4.18 #2 SMP Fri Feb 6 16:50:21 EST 2004 i686 unknown
ethernet driver eepro100 17776 1
[EMAIL PROTECTED]:~$ /sbin/ifconfig
eth0 Link encap:Ethernet HWaddr 00:02:55:C6:81:D9
inet addr:192.146.226.15 Bcast:192.146.226.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:273825654 errors:20 dropped:0 overruns:0 frame:0
TX packets:112693700 errors:0 dropped:0 overruns:66 carrier:52178
collisions:230037 txqueuelen:100
RX bytes:2298858970 (2.1 GiB) TX bytes:2439879993 (2.2 GiB)
Interrupt:27 Base address:0x8000
[EMAIL PROTECTED]:~$ uptime
11:47:38 up 125 days, 15:05, 1 user, load average: 0.23, 0.10, 0.10
at bottom of stack: sitting on top of a rack mounted UPS.
--------------------
pcnet32 14048 1
mii 1120 0 [pcnet32]
Linux server3 2.4.18 #1 SMP Mon Apr 19 08:28:29 CDT 2004 i686 unknown
eth0 Link encap:Ethernet HWaddr 00:06:29:55:A7:CB
inet addr:192.146.226.201 Bcast:192.146.226.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:9826637 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:6963598 dropped:0 overruns:0 carrier:6963598
collisions:0 txqueuelen:1000
RX bytes:1797960645 (1.6 GiB) TX bytes:4005414049 (3.7 GiB)
Interrupt:16 Base address:0x2200
uptime
11:55:45 up 2 days, 3:31, 3 users, load average: 0.06, 0.02, 0.0
--
------------------------------------------
Ted Knab
Chester, Maryland 21619 USA
------------------------------------------
The perception of knowledge is an egotistical farce in which
humans extrapolate from simplifications.
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