[gpfsug-discuss] multipath.conf for EMC V-max
Matt Weil
mweil at wustl.edu
Tue Nov 15 17:18:50 GMT 2016
http://www.emc.com/collateral/TechnicalDocument/docu5128.pdf
page 219
this is the default in rhel.
device {
vendor "EMC"
product "SYMMETRIX"
path_grouping_policy multibus
getuid_callout "/lib/udev/scsi_id --page=pre-spc3-83 --whitelisted --device=/dev/%n"
path_selector "round-robin 0"
path_checker tur
features "0"
hardware_handler "0"
prio const
rr_weight uniform
no_path_retry 6
rr_min_io 1000
rr_min_io_rq 1
}
my defaults
defaults {
user_friendly_names yes
find_multipaths yes
udev_dir /dev
polling_interval 60
path_grouping_policy multibus
path_checker readsector0
rr_min_io_rq 100
rr_weight priorities
failback immediate
max_fds max
features "0"
}
run multipathd show config to see the defaults.
On 11/15/16 10:59 AM, Wahl, Edward wrote:
Hey Jason if you want to get me an lsscsi output I can probably whip up a multi-path.conf block for your customer or talk to them on the phone if you like.
Ed
----- Reply message -----
From: "Jason Bennett" <jasonbennett at us.ibm.com><mailto:jasonbennett at us.ibm.com>
To: "gpfsug main discussion list" <gpfsug-discuss at spectrumscale.org><mailto:gpfsug-discuss at spectrumscale.org>
Subject: [gpfsug-discuss] multipath.conf for EMC V-max
Date: Tue, Nov 15, 2016 11:37 AM
Trying to help a customer resolve a multipath.conf issue....
I am at a major stopping point regarding my deployment on Linux. I’m working with our SAN Team to get a good /etc/multipath.conf configuration with a stanza for our EMC V-max SAN presented. I have PowerPath installed and the SAN disk can been seen from both linux nodes but I need to set three items in a custom devices stanza to ensure no disks locking. The three items required for concurrent disk without locks are: feature=0, failback=immediate & no_path_retry=fail. If you were to reply with an example of the multipath.conf where you’ve used EMC V-max I would just be tickled pink.
Thanks.
Jason Bennett
IBM
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