Approved: Fortect
Over the past week, some of our users have reported to us that they are experiencing an error from the mpathd daemon. The in.mpathd daemon performs network card (NIC) troubleshooting and repairs. In the event of a network card failure, this situation will result in the transfer of access to the IP network from the failed network card to the backup network card, if any, or to another corporate network card configured as a server slot. The same networkgroup with multiple paths.
Inch.mpathd (1 Million)
Surname | Summary | description | Files | Attributes | see also | diagnostic
Name
- in.mpathd – Daemon for discovery, recovery, automatic failover, and automatic recovery of network adapters (NICs)
Resume
The in.mpathd daemon runs in action, network interface card (NIC) and disaster recovery detection. Almost every time a network card fails, the IP network changes from a failed network card to a backup one whenavailable or other functional network interface card assembled as part of the same multipath network group. After replacing the outgoingby building a network adapter, most repaired network adapters will have full network access again. The in.mpathd daemon can detect and resolve NIC failures using two methods: monitoring the IFF_RUNNING flag for the NIC (link-based error detection) and optionally sending ICMP echo requests and responses. to each NIC (test-based error detection). Link based errorDiscovery does not require any explicit configuration and therefore is indeed always enabled (assuming the network adapter driver supports this feature); Sensor error detection must be enabled by setting a test address (described below), also known as an alternate test address, but has the advantage of testing the entire card transmit and receive network.Track. If only link-based troubleshooting is allowed, then the state of the interface is determined solely from the bound state of the IFF_RUNNING flag. Otherwise, ventilation is considered faulty if any of the methods indicates an error, andwill be revised as soon as both methods showthe error has changed. Not all interfaces of the desired group need to be configured using actual error detection techniques. As mentioned above, in.mpathd must have a dedicated test address on each NIC to perform NIC based failure detection to send and receive probes on the NIC. Use the command parameter ifconfig For failover , configure these test email addresses. See Ifconfig (1M). The test address must be on a subnet that must be recognized as hosts and routers on the link. Fortect is the world's most popular and effective PC repair tool. It is trusted by millions of people to keep their systems running fast, smooth, and error-free. With its simple user interface and powerful scanning engine, Fortect quickly finds and fixes a broad range of Windows problems - from system instability and security issues to memory management and performance bottlenecks. The in.mpathd daemon can detect network adapter failure in two ways, in addition to this fix, by sending and receiving ICMP requests, echoes and responses on each network adapter, and by flag type. IFF_RUNNING for each NIC. The link indicates to models that some network adapters are identified by the IFF_RUNNING flag, which makes it easy to detect errors if the link is completely broken. Demon in.mpathd directly assumes that the network card is present if one of the previous two fails.Methods indicate errors. A network card is considered repaired only if both methods together indicate that the network card has been repaired. The in.mpathd daemon transmits ICMP request echo probes that can be connected to routers. If the router is not available, it sends probes to neighboring devices. Therefore, to detect and resolve network failures, there must be at least one neighbor on each channel that is responding.to detect ICMP request probes. in. Works by mpathd over IPv4 and IPv6. If IPv4 is installed on a good network card, a test IPv4 address is created on it and the network card is created as part of the network multipath community, then in.mpathd Start sending ICMP probes to your IPv4 NIC with. For IPv6, the link-local address must be created as a test address. The in.mpathd daemon cannot accept an unrelated local address as a test address. If the network card is literally part of the Multipath groups and the entire test address has been configured, in.mpathd can check the network card for IPv6 errors. Even if both IPv4 and IPv6 flow protocols are enabled, it is sufficient to configure only one of the few, that is, either a test IPv4 email address or a test IPv6 address on a specific NIC. If only one test IPv4 address is configured, only ICMPv4 is used. If only one IPv6 is checkedOptimized address, it only checks ICMPv6. With two test addresses configured for the model, run probes that use both ICMPv4 and ICMPv6. The in.mpathd daemon accesses variable values in / etc / default / mpathd : FAILURE_DETECTION_TIME , FAILBACK and TRACK_INTERFACES_ONLY_WITH_GROUPS . The variable FAILURE_DETECTION_TIME specifies an integer NIC error detection time for the ICMP echo request check method for diagnosing network adapter errors. The shorter the error detection time, the higher the traffic volume of the test blog. guiltThe FAILURE_DETECTION_TIME value is 10 minutes. This means that a network card failure will be noticed by in.mpathd for 10 seconds. NIC failures detected by the IFF_RUNNING flag are usually suppressed because in soas, relative to the in.mpathd daemon, the ratings are changed under this ci flag. NIC recovery detection free time cannot be configured; however, it is specified as a double value FAILURE_DETECTION_TIME . By default, in.mpathd detects errors only if network adapters are configured as part of a meaningful multipath group. You can assign TRACK_INTERFACES_ONLY_WITH_GROUPS no to enable error detection only through in.On mpathd all network adapters, even if they are probably not part of multipath rupture. However, in.mpathd cannot switch from another failed network adapter, unless it is running as a multipath group. The in.mpathd daemon will most likely restore the transport network to a previously normally failed network adapter after it detects a patch on the network adapter. To disable this, set FAILBACK to In no / etc / default / mpathd . Description
Approved: Fortect
files
- / etc / default / mpathd
Contains the default values used by the in.mpathd daemon.
Attributes
See Attributes (5) for a description of the following attributes:
|
ATTRIBUTE TYPE |
ATTRIBUTE VALUE |
|---|---|
|
Availability |
SUNWcsr |
See also
ifconfig (1M), Attribute (5), icmp (7P), icmp6 (7P),
System Manual: IP Service Management
Diagnostics
test address address is not unique; making it difficult to detect errors based on probes on interface_name
Description:
For in.mpathd to perform error testing-based detection, each test address in the group must be completely different. Since the test IPv6 address a is considered a link-local address obtained from the MAC URL, each IP interface must be included in the selection.have a unique MAC address.
NIC interface_name of number If group_name is not connected for IPv [4 | 6], it can also affect the failover capability
Description:
All NICs in a multipath group must be evenly spaced. For example, if one network adapter can be connected for IPv4, all network adapters in most groups should be connected for IPv4. The streaming modules on all network cards must be identical.
No test address configured for interface interface name to disable detection based on error patterns
Description:
For in.mpathd to perform full probe-based failure detection on the network adapter, this tool must be configured with an address: try IPv4, IPv6, or both. Link
looks like it has been on interface_name more than twice in the last minute; this stabilizes the deactivation of failover.
Description:
To ensure that connections to unstable equipment such as a depressor cable do not fail over and always recover, in.mpathd does not switch to frequently changing user interface connection states. Error
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