Re: [ovirt-users] oVirt Instability with Dell Compellent via iSCSI/Multipath
----- Original Message -----
From: "Chris Jones - BookIt.com Systems Administrator"
<chris.jones(a)bookit.com>
To: users(a)ovirt.org
Sent: Friday, May 22, 2015 8:55:37 PM
Subject: Re: [ovirt-users] oVirt Instability with Dell Compellent via iSCSI/Multipath
> Is there maybe some IO problem on the iSCSI target side?
> IIUIC the problem is some timeout, which could indicate that the target
> is overloaded.
Maybe. I need to check with Dell. I did manage to get it to be a little
more stable with this config.
defaults {
polling_interval 10
path_selector "round-robin 0"
path_grouping_policy multibus
getuid_callout "/usr/lib/udev/scsi_id --whitelisted
--replace-whitespace --device=/dev/%n"
path_checker readsector0
rr_min_io_rq 100
max_fds 8192
rr_weight priorities
failback immediate
no_path_retry fail
user_friendly_names no
You should keep the default without change, and add specific settings under
the device section.
}
devices {
device {
vendor COMPELNT
product "Compellent Vol"
path_checker tur
no_path_retry fail
This is mostly likely missing some settings. You are *not* getting the settings
from the "defaults" section above.
For example, since you did not specify here "failback immediate", failback for
this device defaults to whatever default multipath chose, not the value set
in "defaults" above.
}
}
I referenced it from
http://en.community.dell.com/techcenter/enterprise-solutions/w/oracle_sol....
I modified it a bit since that is Red Hat 5 specific and there have been
some changes.
It's not crashing anymore but I'm still seeing storage warnings in
engine.log. I'm going to be enabling jumbo frames and talking with Dell
to figure out if it's something on the Compellent side. I'll update here
once I find something out.
Lets continue this on bugzilla.
See also this patch:
https://gerrit.ovirt.org/41244
Nir