Red Hat Summit7.4. DM Multipath overrides of the device timeout
The recovery_tmo sysfs option controls the timeout for a particular iSCSI device.
The following options globally override the recovery_tmo values:
-
The
replacement_timeoutconfiguration option globally overrides therecovery_tmovalue for all iSCSI devices. For all iSCSI devices that are managed by DM Multipath, the
fast_io_fail_tmooption in DM Multipath globally overrides therecovery_tmovalue.The
fast_io_fail_tmooption in DM Multipath also overrides thefast_io_fail_tmooption in Fibre Channel devices.
The DM Multipath fast_io_fail_tmo option takes precedence over replacement_timeout. Every time the multipathd service is reloaded, it resets recovery_tmo to the value of the fast_io_fail_tmo configuration option. Use the DM multipath fast_io_fail_tmo configuration option to override recovery_tmo in devices managed by DM Multipath.
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