[ovirt-users] Re: Multipath flapping with SAS via FCP

Hi Nir Soffer, Thank for your reply Indeed, the device fails immediately after it was reinstated. There is my 'multipathd show config' dump : defaults { verbosity 2 polling_interval 5 max_polling_interval 20 reassign_maps "no" multipath_dir "/lib64/multipath" path_selector "service-time 0" path_grouping_policy "failover" uid_attribute "ID_SERIAL" prio "const" prio_args "" features "0" path_checker "tur" alias_prefix "mpath" failback "manual" rr_min_io 1000 rr_min_io_rq 1 max_fds 4096 rr_weight "uniform" no_path_retry 16 queue_without_daemon "no" flush_on_last_del "yes" user_friendly_names "no" fast_io_fail_tmo 5 dev_loss_tmo 60 bindings_file "/etc/multipath/bindings" wwids_file "/etc/multipath/wwids" prkeys_file "/etc/multipath/prkeys" log_checker_err always all_tg_pt "no" retain_attached_hw_handler "yes" detect_prio "yes" detect_checker "yes" force_sync "no" strict_timing "no" deferred_remove "no" config_dir "/etc/multipath/conf.d" delay_watch_checks "no" delay_wait_checks "no" san_path_err_threshold "no" san_path_err_forget_rate "no" san_path_err_recovery_time "no" marginal_path_err_sample_time "no" marginal_path_err_rate_threshold "no" marginal_path_err_recheck_gap_time "no" marginal_path_double_failed_time "no" find_multipaths "on" uxsock_timeout 4000 retrigger_tries 3 retrigger_delay 10 missing_uev_wait_timeout 30 skip_kpartx "no" disable_changed_wwids ignored remove_retries 0 ghost_delay "no" find_multipaths_timeout -10 enable_foreign "" marginal_pathgroups "no" } blacklist { devnode "!^(sd[a-z]|dasd[a-z]|nvme[0-9])" wwid "36f402700f232e40026b41bd43a0812e5" protocol "(scsi:adt|scsi:sbp)" ... } blacklist_exceptions { protocol "scsi:sas" } devices { ... device { vendor "COMPELNT" product "Compellent Vol" path_grouping_policy "multibus" no_path_retry "queue" } ... } overrides { no_path_retry 16 } And there is my scsi disks (sdb & sdc disks) : [root@anarion-adm ~]# lsscsi -l [0:2:0:0] disk DELL PERC H330 Adp 4.30 /dev/sda state=running queue_depth=256 scsi_level=6 type=0 device_blocked=0 timeout=90 [1:0:0:2] disk COMPELNT Compellent Vol 0704 /dev/sdb state=running queue_depth=254 scsi_level=6 type=0 device_blocked=0 timeout=30 [1:0:1:2] disk COMPELNT Compellent Vol 0704 /dev/sdc state=running queue_depth=254 scsi_level=6 type=0 device_blocked=0 timeout=30 My disk configuration is present in multipath, and the DELLEMC documentation & white paper don't specifying exotics configuration for multipathd. (I'm wrong ?) I looked modules for SAS & FCP driver, they look good : [root@anarion-adm ~]# lsmod | grep sas mpt3sas 303104 4 raid_class 16384 1 mpt3sas megaraid_sas 172032 2 scsi_transport_sas 45056 1 mpt3sas [root@anarion-adm ~]# lsmod | grep fc bnx2fc 110592 0 cnic 69632 1 bnx2fc libfcoe 77824 2 qedf,bnx2fc libfc 147456 3 qedf,bnx2fc,libfcoe scsi_transport_fc 69632 3 qedf,libfc,bnx2fc Do you think my device is misconfigured? should I check on the vendor side? Another idea ? :)