21.5. Removing a Path to a Storage Device
If you are removing a path to a device that uses multipathing (without affecting other paths to the device), then the general procedure is as follows:
After performing Procedure 21.2, “Removing a Path to a Storage Device”
, the path can be safely removed from the running system. It is not necessary to stop I/O while this is done, as device-mapper-multipath
will re-route I/O to remaining paths according to the configured path grouping and failover policies.
Other procedures, such as the physical removal of the cable, followed by a rescan of the SCSI bus to cause the operating system state to be updated to reflect the change, are not recommended. This will cause delays due to I/O timeouts, and devices may be removed unexpectedly. If it is necessary to perform a rescan of an interconnect, it must be done while I/O is paused, as described in Section 21.9, “Scanning Storage Interconnects”