Description of problem:

multipath (device-mapper-multipath-0.4.7-42.el5) on RHEL5 doesn't seem to support the following flags (672575): 

    fast_io_fail_tmo        
    dev_loss_tmo  

and when initiating multipath -l, i get the following error: 

mulipath.conf line 19, invalid keyword: fast_io_fail_tmo
mulipath.conf line 20, invalid keyword: dev_loss_tmo

please reconfigure multipath and remove those entries till multipath will back-port the fix.

[root@nott-vds2 ~]# cat /etc/multipath.conf
# RHEV REVISION 0.5

attached multipath.conf output from rhel5.6

defaults {
    udev_dir                /dev
    polling_interval        5
    selector                "round-robin 0"
    path_grouping_policy    multibus
    getuid_callout          "/sbin/scsi_id -g -u -s /block/%n"
    prio_callout            /bin/true
    path_checker            readsector0
    rr_min_io               100
    max_fds                 8192
    rr_weight               priorities
    failback                immediate
    no_path_retry           fail
    user_friendly_names     no
    flush_on_last_del       yes
    fast_io_fail_tmo        5
    dev_loss_tmo            30
}