HPE Storage Users Group https://3parug.com/ |
|
3Par/OEL7/Multipath Issue https://3parug.com/viewtopic.php?f=18&t=3225 |
Page 1 of 1 |
Author: | steve_berry [ Wed Jun 26, 2019 3:32 pm ] |
Post subject: | 3Par/OEL7/Multipath Issue |
Hi All, We have a strange issue that when we simulate a failover we only get 3 out of 4 paths back. The environment is IBM/Lenovo SR 560 servers running Oracle Linux 7.6. These are part of a RAC cluster but that doesn't come into play here. Basically we have two fiber cards connected to two different switches for 4 paths to each lun (2 per fabric). When you pull one cable (or shut one switch port down) you see 2 active and 2 failed paths. This much is normal. When you plug the cable back in we end up with 3 active paths and 1 failed. Restarting multipathd results in losing the failed path completely and only a reboot will get it back. Can someone point us in the right direction here? Below is our multipath.conf file. Thanks. defaults { user_friendly_names yes find_multipaths yes } blacklist { devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*" devnode "^(hd|xvd|vd)[a-z]*" wwid "*" devnode "^asm/*" # for DBA devnode "ofsctl" # for DBA } devices { device { vendor "3PARdata" product "VV" features "0" hardware_handler "1 alua" path_selector "round-robin 0" #getuid_callout "/lib/udev/scsi_id --whitelisted --device=/dev/%n" path_grouping_policy "group_by_prio" prio "alua" failback "immediate" rr_weight "uniform" no_path_retry fail rr_min_io_rq 1 path_checker "tur" detect_prio "yes" fast_io_fail_tmo 30 dev_loss_tmo "infinity" } } blacklist_exceptions { wwid "360002ac0000000000000037c0002140b" wwid "360002ac0000000000000037d0002140b" wwid "360002ac0000000000000036e0002140b" wwid "360002ac0000000000000036f0002140b" wwid "360002ac0000000000000037a0002140b" wwid "360002ac000000000000003820002140b" } |
Author: | MammaGutt [ Thu Jun 27, 2019 2:04 am ] |
Post subject: | Re: 3Par/OEL7/Multipath Issue |
What persona is the host configured with? |
Author: | steve_berry [ Thu Jun 27, 2019 8:41 am ] |
Post subject: | Re: 3Par/OEL7/Multipath Issue |
The persona is set to 2. |
Author: | MammaGutt [ Thu Jun 27, 2019 1:21 pm ] |
Post subject: | Re: 3Par/OEL7/Multipath Issue |
That means that ALUA is correct. Just taking a quick look into the implementation guide and your multipath.conf there seems to be a few differences. I suggest looking more into that. I'm not OEL expert but there is a "polling interval" defined under defaults which might come into play (not sure what defaults are). There are also some comments in SPOCK if you are using Cisco SAN-switches. https://support.hpe.com/hpsc/doc/public ... =c04448818 |
Page 1 of 1 | All times are UTC - 5 hours |
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group http://www.phpbb.com/ |