<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<p>Hi,</p>
<p>It appears we are using `queue_if_no_path`</p>
<p>device {<br>
vendor "NETAPP"<br>
product "LUN.*"<br>
path_grouping_policy "group_by_prio"<br>
path_checker "tur"<br>
features "3 queue_if_no_path pg_init_retries 50"<br>
hardware_handler "0"<br>
prio "ontap"<br>
failback "immediate"<br>
rr_weight "uniform"<br>
rr_min_io 128<br>
flush_on_last_del "yes"<br>
dev_loss_tmo "infinity"<br>
user_friendly_names "no"<br>
retain_attached_hw_handler "yes"<br>
detect_prio "yes"</p>
<p>We are using libvirt virt driver and this is the info from `sudo
virsh dominfo $instance_uuid`</p>
<p>Id: -<br>
Name: instance-00049282<br>
UUID: c8079e85-4777-4615-9d5a-3d1151e11984<br>
OS Type: hvm<br>
State: shut off<br>
CPU(s): 1<br>
Max memory: 1048576 KiB<br>
Used memory: 1048576 KiB<br>
Persistent: yes<br>
Autostart: disable<br>
Managed save: no<br>
Security model: apparmor<br>
Security DOI: 0</p>
<p><br>
</p>
<p>We are using an old version of OpenStack ( Queens ) that we are
in the process of migrating away from. Not sure it is worth
raising a bug on such an old version?<br>
</p>
<p>Happy to do so if it will help.</p>
<p>Regards,<br>
</p>
<div class="moz-cite-prefix">On 28/10/2020 10:06, Lee Yarwood wrote:<br>
</div>
<blockquote type="cite"
cite="mid:20201028100606.yvrbn64z5oexreso@lyarwood-laptop.usersys.redhat.com">
<pre class="moz-quote-pre" wrap="">On 28-10-20 17:35:59, Tony Pearce wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">Grant,
As a guess I am suspecting your "fail_if_no_path" might be the issue but I
am not sure on the inner workings or mechanism at play during the reboot or
why it's getting stuck here for you. Your storage vendor may have
documentation to state what the multipath (and iscsid) config should be
from your host. Before changing config though I recommend getting the root
cause realised. /var/log/messages log could help.
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">
Did you mean queue_if_no_path?
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">Also if you go into the multipath CLI "multipathd -k" and issue "show
config" you may see a "NETAPP" config there already. Depending on the IDs
your storage may be matching that rather than the default config within
multipath.conf FYI.
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">
So Nova will ask os-brick to try to disconnect volumes during a hard
reboot of an instance and I suspect this is where things are getting
stuck in your env if you're using queue_if_no_path.
Assuming you're using the libvirt virt driver has the underlying domain
for the instance been destroyed already?
$ sudo virsh dominfo $instance_uuid
If it has been then we might be able to cleanup the volume manually.
Either way it might be useful to raise a bug for this against Nova and
os-brick so we can take a look at the attempt to hard reboot in more
detail.
<a class="moz-txt-link-freetext" href="https://launchpad.net/nova/+filebug">https://launchpad.net/nova/+filebug</a>
^ Please use the template underneath the futher information textbox once
you've provided a title and if possible include the additional output
somewhere for review.
$ openstack server event list $instance_uuid
^ This will provide a list of actions and their associated request-ids.
Using the request-id assocaited with the failing hard reboot can you
then provide logs from the compute.
$ zgrep -l $request-id /var/log/nova/*
^ Obviously this depends on how logging is enabled in your env but you
hopefully get the idea.
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">On Wed, 28 Oct 2020 at 15:56, Grant Morley <a class="moz-txt-link-rfc2396E" href="mailto:grant@civo.com"><grant@civo.com></a> wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">Hi Tony,
We are using NetApp SolidFire for our storage. Instances seem to be in a
normal "working" state before we try and reboot them.
I haven't looked into `/usr/bin/rescan-scsi-bus.sh` but I will now so
thanks for that.
We are using multipath but kept it on the defaults so it looks like only 1
path is being used.
I had a feeling it was down to heavily loaded compute causing the issue.
The config for iscsi is also the defaults from which openstack Ansible
deployed.
Thanks for your help.
Grant
On 28/10/2020 02:25, Tony Pearce wrote:
Hi Grant, what storage are you using here? Is the instance in an
apparently "working" state before you try and reboot it?
Have you looked into `/usr/bin/rescan-scsi-bus.sh` ? Please see this
reference link in the first instance: [1] "When ‘rescan-scsi-bus.sh -i’ is
run, script execute as well a LIP_RESET (ISSUE_LIP) which may cause a
disruption in I/O on the server and even cause an outage in case of a
system running on heavy load."
Are you using multipath? Some helpful commands:
`tail -f /var/log/messages | grep multipath`
`multipathd -k` = will go into mutipath cli. Then while in the cli:
show config
show paths
If the cli is accessible then you're likely using multipath even if 1
path. Then the multipath.conf is taking effect even if it's a default
config.
Config files relating to iscsi storage:
/etc/iscsi/iscsid.conf
/etc/multipath/multipath.conf
[1]
<a class="moz-txt-link-freetext" href="https://www.thegeekdiary.com/when-to-use-rescan-scsi-bus-sh-i-lip-flag-in-centos-rhel/">https://www.thegeekdiary.com/when-to-use-rescan-scsi-bus-sh-i-lip-flag-in-centos-rhel/</a>
Regards,
Tony Pearce
On Wed, 28 Oct 2020 at 03:39, Grant Morley <a class="moz-txt-link-rfc2396E" href="mailto:grant@civo.com"><grant@civo.com></a> wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">Hi all,
We are seeing some oddness on a couple of our compute hosts that seems to
be related to iSCSI. On a couple of our hosts I am seeing this error in the
nova compute logs:
2020-10-27 18:56:14.814 31490 WARNING os_brick.initiator.connectors.iscsi
[req-8613ae69-1661-49cf-8bdc-6fec875d01ba - - - - -] Couldn't find iscsi
sessions because iscsiadm err: iscsiadm: could not read session targetname:
5
iscsiadm: could not find session info for session1707
That seems to also stop any instance on the compute host from being able
to reboot. Reboots seem to get accepted but the instance never completes
and gets stuck in the reboot state:
2020-10-27 19:11:58.891 48612 INFO nova.compute.manager [-] [instance:
c8079e85-4777-4615-9d5a-3d1151e11984] During sync_power_state the instance
has a pending task (reboot_started_hard). Skip.
2020-10-27 19:11:58.891 48612 INFO nova.compute.manager [-] [instance:
31128f26-910d-411f-98e0-c95dd36f4f0f] During sync_power_state the instance
has a pending task (reboot_started_hard). Skip.
Does anyone know of a way to resolve this without rebooting the entire
compute host? I can't see any other issues other than the fact there is
this iSCSI error which in turn seems to stop nova from processing anything
for any instance.
Any advice would be much appreciated.
Regards,
</pre>
</blockquote>
</blockquote>
</blockquote>
<pre class="moz-quote-pre" wrap="">
</pre>
</blockquote>
<div class="moz-signature">-- <br>
<div dir="auto">
<table width="100%" cellspacing="0" cellpadding="0">
<tbody>
<tr>
<td>
<div style="line-height: 15px; color: rgb(109, 190,
255); margin-bottom: 5px;"><span style="font-weight:
bold; font-size: 110%; color: rgb(35, 157, 255);">Grant
Morley</span></div>
<div style="line-height: 15px; color: #888888;
margin-bottom: 10px;">Cloud Engineer, <span
style="color: rgb(35, 157, 255)">Civo Ltd</span></div>
<div style="margin-right: 110px; line-height: 15px;
color: #888888; margin-bottom: 10px;"><span style="">Unit
H-K, Gateway 1000, Whittle Way<br>
Stevenage, Herts, SG1 2FP, UK</span></div>
</td>
<td valign="top" align="right"><img
src="https://www.civo.com/images/email-logo.jpg"
style="width: 100px; color: rgb(168, 216, 255);
line-height: 15px; float: none; margin-top: 0px;
margin-right: 10px;"></td>
</tr>
</tbody>
</table>
<table width="100%" cellspacing="0" cellpadding="0" border="0">
<tbody>
<tr>
<td style="padding: 4px; background-color: rgb(35, 157,
255); color: white;" width="*">Visit us at <a
href="https://www.civo.com/" style="color: white;
line-height: 15px; text-decoration: none;">www.civo.com</a></td>
<td width="2"><br>
</td>
<td style="text-align: center; padding: 4px;
background-color: rgb(240, 240, 240);
background-position: initial initial; background-repeat:
initial initial;" width="200"><a
href="https://www.civo.com/signup" style="color:
rgb(35, 157, 255); line-height: 15px; margin-right:
6px; text-decoration: none;">Signup for an account now
></a></td>
</tr>
</tbody>
</table>
</div>
</div>
</body>
</html>