12-27-2007
IPMP is great, but beware that the "resilience" it offers can be an illusion.
- If you have a system with a quad ether (eg. qfe) card, then you don't get much resilience by using IPMP on two ports in the same card. You do get protection against accidentally pulling out a single LAN cable, but you are still susceptible to failure of that card, and to an accident involving both cables.
- If your LAN cables run to the same patch panel, then you are susceptible to any problems with that.
- If your cables attach to the same network switch, then you are dependent upon that.
- If your cables all go to the back of the cabinet, then you are susceptible to an accident there. (Some systems have card cages at the front and back of the machine, to allow completely independent routing of the cables.)
- Etc, all the way along the chain.
Oh, and if you're doing it for LAN interfaces, then you need to do the same for disks (SCSI and/or FC), and mains cables too!
Basically you have to sonsider your whole environment and eliminate and
SPOFs (Single Points Of Failure).
Welcome to the world of managing datacentre computers!
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LEARN ABOUT OPENSOLARIS
if_mpadm
if_mpadm(1M) System Administration Commands if_mpadm(1M)
NAME
if_mpadm - administer interfaces in an IP multipathing group
SYNOPSIS
if_mpadm -d | -r ifname
DESCRIPTION
The if_mpadm utility administers IP interfaces that are part of an IP Multipathing (IPMP) group. Currently, administration is limited to
offlining IP interfaces and undoing previous offline operations.
When an IP interface is taken offline, all IP data traffic that was flowing over the IP interface is moved to another IP interface in the
IPMP group. In addition, all UP IP addresses hosted on the IP interface are brought down, causing in.mpathd(1M) to stop probe-based failure
detection on the IP interface. As a result, an offline IP interface will not be used for any inbound or outbound IP traffic. Only IP inter-
faces that are in an IPMP group may be brought offline. If the IP interface is the last functioning interface in the IPMP group, the off-
line operation will fail.
When an offline operation is undone, any IP addresses hosted on that IP interface are brought UP and will be considered by in.mpathd for
probe-based failure detection. In addition, provided the IP interface is otherwise active (see in.mpathd(1M)), it will again be used to
send and receive IP data traffic for the IPMP group. Note that not all offline operations can be undone. For instance, in.mpathd may have
offlined an IP interface because its hardware address was not unique within its IPMP group. The ipmpstat utility can be used to determine
why an IP interface is offline, identify which IP interfaces in a group are being used for inbound and outbound IP traffic, and more; see
ipmpstat(1M).
OPTIONS
The if_mpadm utility supports the following options:
-d ifname Offline the IP interface specified by ifname. If ifname is not in an IPMP group, or the offline would cause the IPMP group to
lose network connectivity, the operation will fail.
-r ifname Undo a previous offline of the IP interface specified by ifname. If ifname is not offline, the operation will fail.
EXAMPLES
Example 1 Offlining an IP Interface
The following command offlines the IP interface under0, causing any IP packets that were being sent and received through it to be handled
by another IP interface in its group.
example% if_mpadm -d under0
Example 2 Undoing a Previous Offline Operation
Use the following command to undo the operation in the previous example:
example% if_mpdadm -r under0
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|Interface Stability |Unstable |
+-----------------------------+-----------------------------+
SEE ALSO
ifconfig(1M), in.mpathd(1M), ipmpstat(1M), attributes(5)
DIAGNOSTICS
cannot offline: no other functioning interfaces are in its IPMP group.
Description:
This message means that offlining the IP interface would leave the IPMP group without network connectivity.
cannot offline: not a physical interface or not in an IPMP group
Description:
This means that the IP interface is not an underlying interface in an IPMP group, and therefore is not eligible to be offlined.
SunOS 5.11 5 Jan 2009 if_mpadm(1M)