Use these instructions to prepare your CMM for
redundant operation.
To prepare your CMM for
redundancy, complete the following steps:
- Install the standby CMM in
the available CMM bay.
- Wait approximately 2 minutes while the primary CMM transfers
firmware and configuration information to the standby CMM.
Note:
- Whenever power is restored to a Flex System chassis that has two
functional CMMs,
the CMM in CMM bay
1 is typically prioritized as the primary CMM,
even if the CMM in CMM bay
2 was the primary CMM before
power was removed, however, sometimes the CMM in
bay 2 will be prioritized, making it the primary CMM.
- For the most recent versions of optional management software,
that you can use to manage a Lenovo Flex System
chassis with
a redundant CMM,
go to Lenovo Datacenter Support site.
- Configure CMM failover
response:
- Configure failover response for loss of the primary CMM:
Note:
- If you enable IP address swapping during failover with
both CMMs
set to the same static IP address, you must disable DHCP.
- In the CMM web
interface, CMM failover
is configured on the Advanced Failover page on the Management
Module Properties page (select Properties from the Mgt Module
Management menu). All fields and options are fully described in
the CMM web
interface online help.
- In the CMM CLI,
use the advfailover command (see advfailover command for information about command
use).
- Configure failover response for loss of the management network
(uplink) connection to the primary CMM:
Note: Failure of the management network (uplink) connection
to the primary
CMM is
indicated when all of the following conditions occur:
- Loss of CMM eth0 input and output packets
- Network noise
- Failures when pinging the CMM gateway and a designated station
- In the CMM web
interface, uplink failover is configured on the Ethernet page
on the Network Protocol Properties page (select Network from
the Mgt Module Management menu). All fields and options are
fully described in the CMM web
interface online help.
- In the CMM CLI,
use the uplink command (see uplink command for information about command
use).
- If a Flex System chassis
is set up for redundant CMM operation
and both CMMs
experience an unrecoverable failure, the chassis will attempt to switch
control between the CMMs
indefinitely. If this condition occurs, replace one CMM to
return the chassis to operation or replace both CMMs
to return the chassis to redundant operation. Depending on how each CMM failed,
you might need to configure the replacement CMM or
restore its configuration from a backup, if one is available. A failure
of both CMMs
might be an indication of other problems with the Flex System chassis;
make sure that the chassis is operating properly before replacing
either CMM.
See Troubleshooting chassis for information
about diagnosing problems with a Flex System chassis.