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https://en.wikipedia.org/wiki/Linux_DM_Multipath | https://en.wikipedia.org/wiki/Linux_DM_Multipath | ||
| + | https://linux.die.net/man/8/multipath | ||
| − | + | * <code>multipath -l</code> | |
| − | + | * <code>multipath -ll</code> | |
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| − | * <code>multipath -l</code> | ||
| − | * <code> | ||
** <code>multipath -ll DEVICE_NAME</code> | ** <code>multipath -ll DEVICE_NAME</code> | ||
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* <code>multipath -t</code> | * <code>multipath -t</code> | ||
:<code>-t</code> Display the currently used [[multipathd]] configuration | :<code>-t</code> Display the currently used [[multipathd]] configuration | ||
| − | * <code> | + | * <code>multipathd show config</code> |
* [[Ubuntu]]: <code>multipath-tools</code> package | * [[Ubuntu]]: <code>multipath-tools</code> package | ||
| − | ** Binaries: <code>multipath</code> <code>[[multipathd]]</code> <code> | + | ** Binaries: <code>multipath</code> <code>[[multipathd]]</code> <code>mpathpersist</code> |
* [[RHEL]]: <code>device-mapper-multipath</code> package | * [[RHEL]]: <code>device-mapper-multipath</code> package | ||
Config files: | Config files: | ||
| − | * <code>/etc/ | + | * <code>/etc/multipath.conf</code><ref>https://www.thegeekdiary.com/understanding-the-dm-multipath-configuration-file-etc-multipath-conf/</ref><code>https://manpages.debian.org/unstable/multipath-tools/multipath.conf.5.en.html</code> |
| − | * <code>/etc/multipath/ | + | * <code>/etc/multipath/wwids</code> |
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| + | :multipath -w 3600a09803831417a5a244f5665797a48 | ||
| + | :wwid '3600a09803831417a5a244f5665797a48' removed | ||
| + | |||
| + | multipath -W | ||
| + | successfully reset wwids | ||
| − | == Configuration file: /etc/ | + | == Configuration file: /etc/multipath.conf <ref>https://en.wikipedia.org/wiki/Linux_DM_Multipath</ref>== |
# System level defaults (''defaults''): User can override system level defaults. | # System level defaults (''defaults''): User can override system level defaults. | ||
# Blacklisted devices (''blacklist''): User specifies the list of devices that is not to be under the control of DM-MPIO. | # Blacklisted devices (''blacklist''): User specifies the list of devices that is not to be under the control of DM-MPIO. | ||
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# Storage controller specific settings (''devices''): User specified configuration settings will be applied to devices with specified "Vendor" and "Product" information. | # Storage controller specific settings (''devices''): User specified configuration settings will be applied to devices with specified "Vendor" and "Product" information. | ||
# Device specific settings (''multipaths''): Fine tune the configuration settings for individual LUNs. | # Device specific settings (''multipaths''): Fine tune the configuration settings for individual LUNs. | ||
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| + | == Default multipath.conf configuration == | ||
| + | <pre> | ||
| + | RHEL | ||
| + | cat /etc/multipath.conf | grep -v "#" | grep . | ||
| + | defaults { | ||
| + | polling_interval 5 | ||
| + | no_path_retry 4 | ||
| + | user_friendly_names no | ||
| + | flush_on_last_del yes | ||
| + | fast_io_fail_tmo 5 | ||
| + | dev_loss_tmo 30 | ||
| + | max_fds 4096 | ||
| + | } | ||
| + | blacklist { | ||
| + | protocol "(scsi:adt|scsi:sbp)" | ||
| + | } | ||
| + | devices { | ||
| + | device { | ||
| + | all_devs yes | ||
| + | no_path_retry 4 | ||
| + | } | ||
| + | } | ||
| + | |||
| + | </pre> | ||
== Routing policies implemented: failover, multibus and group_by_serial == | == Routing policies implemented: failover, multibus and group_by_serial == | ||
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== Readings == | == Readings == | ||
* Varoqui, C. (2010.) The Linux multipath implementation. Retrieved from http://christophe.varoqui.free.fr/refbook.html | * Varoqui, C. (2010.) The Linux multipath implementation. Retrieved from http://christophe.varoqui.free.fr/refbook.html | ||
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== See also == | == See also == | ||
| − | * | + | * EMC <code>powerpath</code> |
* <code>[[kpartx]]</code> | * <code>[[kpartx]]</code> | ||
| − | * {{ | + | * {{Fibre Channel}} |
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* {{Linux block devices}} | * {{Linux block devices}} | ||
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[[Category:Linux commands]] | [[Category:Linux commands]] | ||
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