Red Hat Summit4.6. iSCSI and DM Multipath overrides
The
recovery_tmo sysfs option controls the timeout for a particular iSCSI device. The following options globally override 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. Thefast_io_fail_tmooption in DM Multipath also overrides thefast_io_fail_tmooption in Fibre Channel devices.The DM Multipathfast_io_fail_tmooption takes precedence overreplacement_timeout. Red Hat does not recommend usingreplacement_timeoutto overriderecovery_tmoin devices managed by DM Multipath because DM Multipath always resetsrecovery_tmowhen themultipathdservice reloads.
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