Re: [ovirt-users] iscsi or iser targets are not detached from the host in the maintenance mode

[Arman Khalatyan]

done: https://bugzilla.redhat.com/show_bug.cgi?id=1422959


On Thu, Feb 16, 2017 at 5:00 PM, Nir Soffer  wrote:

> On Thu, Feb 16, 2017 at 5:55 PM, Arman Khalatyan 
> wrote:
> > The test disks are not attached to any virtual machine. nothing done on
> the
> > hosts.
> >  I just saw that the all test LUNs are still logged into target side so I
> > went to the host(it was in the maintenance ) all disks are still there.
> >
> > I just managing everything over the web gui:
> > Select host as SPM, then disks->new->directLUN->
> discovertargets->login->ok
> > on the host the disks are visible.
> > iscsiadm -m session -o show
> > tcp: [6] 10.10.10.35:3260,1
> > iqn.2003-01.org.linux-iscsi.c1701.x8664:sn.5b791971cd78 (non-flash)
> >
> > Putting host to maintenance:
> > the disks are still there:
> > lsscsi
> > [0:0:0:0]diskATA  ST3500630NS  K /dev/sda
> > [11:0:0:0]   diskLIO-ORG  c1701iser4.0   /dev/sdb
> > [11:0:0:1]   diskLIO-ORG  c1701iser32k 4.0   /dev/sdc
> >
> > activating deactivating the host does not change situation.
> > I dont see any attempt of vdsm to logout the disks. I can see in the
> > vdsmd.logs that "[storage.Mount] unmounting /rhev/data-center/mnt/.."
> > unmounting the nfs part but nothing from [storage.ISCSI]
>
> Sounds like a bug in target discovery flow. We add nodes and sessions and
> do not clean them.
>
> Would you file a bug?
>
> Nir
>
> >
> >
> >
> > On Thu, Feb 16, 2017 at 4:25 PM, Nir Soffer  wrote:
> >>
> >> On Thu, Feb 16, 2017 at 5:13 PM, Arman Khalatyan 
> >> wrote:
> >> > Hi,
> >> > In ovirt 4.1 when I put the host into maintenance mode then the nfs
> >> > mounts
> >> > are unmounted as expected.
> >> > but the hosts are still logged into the targets.
> >> >
> >> > Is it expected behavior?? If yes what is  the use of it?
> >>
> >> No, if ovirt connected to the target, it should disconnect from the
> >> target.
> >>
> >> Maybe you connected manually to the target before that?
> >>
> >> A good test to verify this would be to do this in maintenance mode:
> >>
> >> iscsiadm -m node -o delete
> >>
> >> Then activate and deactivate the host several times, and check that
> >> no iscsi session are active when host enter maintenance.
> >>
> >> > Another thing concerning to the permanently removed direct LUNs.
> >> > They are still in the /var/lib/iscsi/nodes and
> >> > /var/lib/iscsi/send_targets/*
> >> > Would be good to cleanup the folders if users are removing permanently
> >> > the
> >> > LUNs.
> >>
> >> We don't manage the LUNs - if you are removing the LUNs manually, and
> >> the target providing this LUNs is not needed any more, you are
> responsible
> >> for removing the nodes from iscsi database.
> >>
> >> I don't think we are removing nodes and targets from a host, only
> updating
> >> them when you connect to a server. We also don't have a way to remove
> >> a target from engine database, so engine cannot ask vdsm to remove
> >> targets.
> >>
> >> Nir
> >
> >
>
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Re: [ovirt-users] iscsi or iser targets are not detached from the host in the maintenance mode

[Nir Soffer]

On Thu, Feb 16, 2017 at 5:55 PM, Arman Khalatyan  wrote:
> The test disks are not attached to any virtual machine. nothing done on the
> hosts.
>  I just saw that the all test LUNs are still logged into target side so I
> went to the host(it was in the maintenance ) all disks are still there.
>
> I just managing everything over the web gui:
> Select host as SPM, then disks->new->directLUN->discovertargets->login->ok
> on the host the disks are visible.
> iscsiadm -m session -o show
> tcp: [6] 10.10.10.35:3260,1
> iqn.2003-01.org.linux-iscsi.c1701.x8664:sn.5b791971cd78 (non-flash)
>
> Putting host to maintenance:
> the disks are still there:
> lsscsi
> [0:0:0:0]diskATA  ST3500630NS  K /dev/sda
> [11:0:0:0]   diskLIO-ORG  c1701iser4.0   /dev/sdb
> [11:0:0:1]   diskLIO-ORG  c1701iser32k 4.0   /dev/sdc
>
> activating deactivating the host does not change situation.
> I dont see any attempt of vdsm to logout the disks. I can see in the
> vdsmd.logs that "[storage.Mount] unmounting /rhev/data-center/mnt/.."
> unmounting the nfs part but nothing from [storage.ISCSI]

Sounds like a bug in target discovery flow. We add nodes and sessions and
do not clean them.

Would you file a bug?

Nir

>
>
>
> On Thu, Feb 16, 2017 at 4:25 PM, Nir Soffer  wrote:
>>
>> On Thu, Feb 16, 2017 at 5:13 PM, Arman Khalatyan 
>> wrote:
>> > Hi,
>> > In ovirt 4.1 when I put the host into maintenance mode then the nfs
>> > mounts
>> > are unmounted as expected.
>> > but the hosts are still logged into the targets.
>> >
>> > Is it expected behavior?? If yes what is  the use of it?
>>
>> No, if ovirt connected to the target, it should disconnect from the
>> target.
>>
>> Maybe you connected manually to the target before that?
>>
>> A good test to verify this would be to do this in maintenance mode:
>>
>> iscsiadm -m node -o delete
>>
>> Then activate and deactivate the host several times, and check that
>> no iscsi session are active when host enter maintenance.
>>
>> > Another thing concerning to the permanently removed direct LUNs.
>> > They are still in the /var/lib/iscsi/nodes and
>> > /var/lib/iscsi/send_targets/*
>> > Would be good to cleanup the folders if users are removing permanently
>> > the
>> > LUNs.
>>
>> We don't manage the LUNs - if you are removing the LUNs manually, and
>> the target providing this LUNs is not needed any more, you are responsible
>> for removing the nodes from iscsi database.
>>
>> I don't think we are removing nodes and targets from a host, only updating
>> them when you connect to a server. We also don't have a way to remove
>> a target from engine database, so engine cannot ask vdsm to remove
>> targets.
>>
>> Nir
>
>
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Re: [ovirt-users] iscsi or iser targets are not detached from the host in the maintenance mode

[Arman Khalatyan]

The test disks are not attached to any virtual machine. nothing done on the
hosts.
 I just saw that the all test LUNs are still logged into target side so I
went to the host(it was in the maintenance ) all disks are still there.

I just managing everything over the web gui:
Select host as SPM, then disks->new->directLUN->discovertargets->login->ok
on the host the disks are visible.
iscsiadm -m session -o show
tcp: [6] 10.10.10.35:3260,1
iqn.2003-01.org.linux-iscsi.c1701.x8664:sn.5b791971cd78
(non-flash)

Putting host to maintenance:
the disks are still there:
lsscsi
[0:0:0:0]diskATA  ST3500630NS  K /dev/sda
[11:0:0:0]   diskLIO-ORG  c1701iser4.0   /dev/sdb
[11:0:0:1]   diskLIO-ORG  c1701iser32k 4.0   /dev/sdc

activating deactivating the host does not change situation.
I dont see any attempt of vdsm to logout the disks. I can see in the
vdsmd.logs that "[storage.Mount] unmounting /rhev/data-center/mnt/.."
unmounting the nfs part but nothing from [storage.ISCSI]



On Thu, Feb 16, 2017 at 4:25 PM, Nir Soffer  wrote:

> On Thu, Feb 16, 2017 at 5:13 PM, Arman Khalatyan 
> wrote:
> > Hi,
> > In ovirt 4.1 when I put the host into maintenance mode then the nfs
> mounts
> > are unmounted as expected.
> > but the hosts are still logged into the targets.
> >
> > Is it expected behavior?? If yes what is  the use of it?
>
> No, if ovirt connected to the target, it should disconnect from the target.
>
> Maybe you connected manually to the target before that?
>
> A good test to verify this would be to do this in maintenance mode:
>
> iscsiadm -m node -o delete
>
> Then activate and deactivate the host several times, and check that
> no iscsi session are active when host enter maintenance.
>
> > Another thing concerning to the permanently removed direct LUNs.
> > They are still in the /var/lib/iscsi/nodes and
> /var/lib/iscsi/send_targets/*
> > Would be good to cleanup the folders if users are removing permanently
> the
> > LUNs.
>
> We don't manage the LUNs - if you are removing the LUNs manually, and
> the target providing this LUNs is not needed any more, you are responsible
> for removing the nodes from iscsi database.
>
> I don't think we are removing nodes and targets from a host, only updating
> them when you connect to a server. We also don't have a way to remove
> a target from engine database, so engine cannot ask vdsm to remove targets.
>
> Nir
>
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Re: [ovirt-users] iscsi or iser targets are not detached from the host in the maintenance mode

[Nir Soffer]

On Thu, Feb 16, 2017 at 5:13 PM, Arman Khalatyan  wrote:
> Hi,
> In ovirt 4.1 when I put the host into maintenance mode then the nfs mounts
> are unmounted as expected.
> but the hosts are still logged into the targets.
>
> Is it expected behavior?? If yes what is  the use of it?

No, if ovirt connected to the target, it should disconnect from the target.

Maybe you connected manually to the target before that?

A good test to verify this would be to do this in maintenance mode:

iscsiadm -m node -o delete

Then activate and deactivate the host several times, and check that
no iscsi session are active when host enter maintenance.

> Another thing concerning to the permanently removed direct LUNs.
> They are still in the /var/lib/iscsi/nodes and /var/lib/iscsi/send_targets/*
> Would be good to cleanup the folders if users are removing permanently the
> LUNs.

We don't manage the LUNs - if you are removing the LUNs manually, and
the target providing this LUNs is not needed any more, you are responsible
for removing the nodes from iscsi database.

I don't think we are removing nodes and targets from a host, only updating
them when you connect to a server. We also don't have a way to remove
a target from engine database, so engine cannot ask vdsm to remove targets.

Nir
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[ovirt-users] iscsi or iser targets are not detached from the host in the maintenance mode

[Arman Khalatyan]

Hi,
In ovirt 4.1 when I put the host into maintenance mode then the nfs mounts
are unmounted as expected.
but the hosts are still logged into the targets.

Is it expected behavior?? If yes what is  the use of it?
Another thing concerning to the permanently removed direct LUNs.
They are still in the /var/lib/iscsi/nodes and /var/lib/iscsi/send_targets/*
Would be good to cleanup the folders if users are removing permanently the
LUNs.

Thanks,
Arman.
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