9:12 p.m.
On Wed, Jul 19, 2017 at 9:13 PM, Vinícius Ferrão <ferrao(a)if.ufrj.br> wrote:
Hello,
I’ve skipped this message entirely yesterday. So this is per design?
Because the best practices of iSCSI MPIO, as far as I know, recommends two
completely separate paths. If this can’t be achieved with oVirt what’s the
point of running MPIO?
With regular storage it is quite easy to achieve using 'iSCSI bonding'.
I think the Dell storage is a bit different and requires some more
investigation - or experience with it.
Y.
May we ask for a bug fix or a feature redesign on this?
MPIO is part of my datacenter, and it was originally build for running
XenServer, but I’m considering the move to oVirt. MPIO isn’t working right
and this can be a great no-go for me...
I’m willing to wait and hold my DC project if this can be fixed.
Any answer from the redhat folks?
Thanks,
V.
> On 18 Jul 2017, at 11:09, Uwe Laverenz <uwe(a)laverenz.de> wrote:
>
> Hi,
>
>
> Am 17.07.2017 um 14:11 schrieb Devin Acosta:
>
>> I am still troubleshooting the issue, I haven’t found any resolution to
my issue at this point yet. I need to figure out by this Friday otherwise I
need to look at Xen or another solution. iSCSI and oVIRT seems problematic.
>
> The configuration of iSCSI-Multipathing via OVirt didn't work for me
either. IIRC the underlying problem in my case was that I use totally
isolated networks for each path.
>
> Workaround: to make round robin work you have to enable it by editing
"/etc/multipath.conf". Just add the 3 lines for the round robin setting
(see comment in the file) and additionally add the "# VDSM PRIVATE" comment
to keep vdsmd from overwriting your settings.
>
> My multipath.conf:
>
>
>> # VDSM REVISION 1.3
>> # VDSM PRIVATE
>> defaults {
>> polling_interval 5
>> no_path_retry fail
>> user_friendly_names no
>> flush_on_last_del yes
>> fast_io_fail_tmo 5
>> dev_loss_tmo 30
>> max_fds 4096
>> # 3 lines added manually for multipathing:
>> path_selector "round-robin 0"
>> path_grouping_policy multibus
>> failback immediate
>> }
>> # Remove devices entries when overrides section is available.
>> devices {
>> device {
>> # These settings overrides built-in devices settings. It does
not apply
>> # to devices without built-in settings (these use the settings
in the
>> # "defaults" section), or to devices defined in the
"devices"
section.
>> # Note: This is not available yet on Fedora 21. For more info see
>> # https://bugzilla.redhat.com/1253799
>> all_devs yes
>> no_path_retry fail
>> }
>> }
>
>
>
> To enable the settings:
>
> systemctl restart multipathd
>
> See if it works:
>
> multipath -ll
>
>
> HTH,
> Uwe
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