IPMP failover: Why is it occurring?

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IPMP failover: Why is it occurring?

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Operating Systems Solaris IPMP failover: Why is it occurring?

06-04-2008

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IPMP failover: Why is it occurring?

The active NIC has been failing back and forth on two of our T2000s. I don't know when the problem originally began, but I can see failovers in the messages.* files. The network guy says the switches are clean (no errors) so I'm left looking at the configuration or any other issue that may be causing the symptom, and I'm at a loss on how to continue troubleshooting.

Here is a sample from messages.

Quote:

Jun 4 10:50:32 server1 in.mpathd[145]: [ID 299542 daemon.error] NIC repair detected on e1000g1 of group production
Jun 4 10:50:32 server1 in.mpathd[145]: [ID 620804 daemon.error] Successfully failed back to NIC e1000g1
Jun 4 13:16:22 server1 in.mpathd[145]: [ID 594170 daemon.error] NIC failure detected on e1000g1 of group production
Jun 4 13:16:22 server1 in.mpathd[145]: [ID 832587 daemon.error] Successfully failed over from NIC e1000g1 to NIC e1000g0
Jun 4 13:16:31 server1 in.mpathd[145]: [ID 299542 daemon.error] NIC repair detected on e1000g1 of group production
Jun 4 13:16:31 server1 in.mpathd[145]: [ID 620804 daemon.error] Successfully failed back to NIC e1000g1
Jun 4 13:24:22 server1 in.mpathd[145]: [ID 594170 daemon.error] NIC failure detected on e1000g0 of group production
Jun 4 13:24:22 server1 in.mpathd[145]: [ID 832587 daemon.error] Successfully failed over from NIC e1000g0 to NIC e1000g1
Jun 4 13:24:31 server1 in.mpathd[145]: [ID 299542 daemon.error] NIC repair detected on e1000g0 of group production
Jun 4 13:24:31 server1 in.mpathd[145]: [ID 620804 daemon.error] Successfully failed back to NIC e1000g

IPMP is configured as follows:

Quote:

bash-3.00# cat /etc/hostname.e1000g0
private0 netmask + broadcast + group production deprecated -failover up \
addif public0 netmask + broadcast + failover up
bash-3.00# cat /etc/hostname.e1000g1
private1 netmask + broadcast + group production deprecated -failover up \
addif public1 netmask + broadcast + failover up

Edit to add:

Quote:

SunOS server1 5.10 Generic_127111-08 sun4v sparc SUNW,Sun-Fire-T200

dangral

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06-05-2008

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Start at the beginning.

31.Administering IPMP (Tasks) (System Administration Guide: IP Services)

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Hi,

use 127127-11 kernel patch or 128028-03 (single patch, obsoleted by: 127127-11 SunOS 5.10: e1000g patch) for help.

taran

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Quote:

Originally Posted by taran

Hi,

use 127127-11 kernel patch or 128028-03 (single patch, obsoleted by: 127127-11 SunOS 5.10: e1000g patch) for help.

Thank you. I installed the 127127-11 kernel patch.

dangral

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01-12-2009

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Are you able to fix this problem by applying patch?

kamleshm

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01-12-2009

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One problem I've run into is a busy gateway. IPMP uses the first 5 destinations in your routing table to determine if the current running connection is valid. While there may not be errors on the router, it can get busy, and ping requests are given the lowest priority. As discussed on the page linked above, you can increase the timeout value in /etc/default/mpathd.

One way around this is to add static routes to your routing table to addresses that you know will not be delayed in a proper working environment. Not an ideal solution, but it works. This is explained in further detail here, if you have a sun online account.

Padow

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