Re: [ovirt-users] [oVirt4.1] Does oVirt 4.1 support iSCSI offload?

[Yaniv Kaul]

On Wed, May 3, 2017 at 7:57 PM, wodel youchi  wrote:

> Hi again, and sorry for the delay, I was sick, actually I am still
> sick :-(
>
> Just to have more details, from what I have read about iSCSI offload,
> there are two modes, depending on the hardware you have (the adapter),
> using VMware terminology, no offense :-) , there is :
>
> - Dependent mode : in this mode the adapter still need the software iSCSI
> to use the network configuration of the nic port, so the discovery is done
> on tcp, the rest on offload driver like bnxi2.
>

This one is similar to TCP offload - the iSCSI processing is done on the
HW, the rest is done in software and is supported - it looks like regular
iSCSI to oVirt.

>
> - Independent mode : in this mode the adapter takes all the work by
> itself, the network part, it will have it's own IP address and so on, and
> it does not need anything from the OS or the software iSCSI, the
> configuration is made in the BIOS of the adapter, and the connection is
> made before the OS is up.
>

This one indeed is transparent to the OS, and it looks like FC to oVirt.


>
> Does the configuration on oVirt support the two modes? and is there any
> differences when using them, I mean during the setup.
>

Both are supported. The former looks like regular iSCSI, the latter like FC
to oVirt.
Y.


>
> Regards.
>
>
> 2017-04-30 7:47 GMT+01:00 Yaniv Kaul :
>
>>
>>
>> On Sat, Apr 29, 2017 at 7:27 PM, wodel youchi 
>> wrote:
>>
>>> Hi,
>>>
>>> We have two hypervisors, each one has a 10Gbe nic card with two ports,
>>> the cards support iSCSI offload.
>>>
>>> Does oVirt 4.1 support this?
>>>
>>
>> Yes.
>>
>>
>>> if yes how can someone use it on hosted-engine deployment? the VM engine
>>> will be in the SAN targeted by these cards.
>>>
>>
>> Since iSCSI offloading is configured before the OS even loads, to the OS
>> (and therefore oVirt hypervisors) it seems that the storage is 'just
>> connected' - same as FC for all we care.
>>
>> Y.
>>
>>
>>>
>>> Regards.
>>>
>>>
>>> 
>>>  Virus-free.
>>> www.avast.com
>>> 
>>> <#m_4334077165374483247_m_8732461098692771785_m_4452747818142096065_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>>>
>>> ___
>>> Users mailing list
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>>>
>>>
>>
>
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Re: [ovirt-users] [oVirt4.1] Does oVirt 4.1 support iSCSI offload?

[Luca 'remix_tj' Lorenzetto]

On Wed, May 3, 2017 at 6:57 PM, wodel youchi  wrote:

> Hi again, and sorry for the delay, I was sick, actually I am still
> sick :-(
>
> Just to have more details, from what I have read about iSCSI offload,
> there are two modes, depending on the hardware you have (the adapter),
> using VMware terminology, no offense :-) , there is :
>
> - Dependent mode : in this mode the adapter still need the software iSCSI
> to use the network configuration of the nic port, so the discovery is done
> on tcp, the rest on offload driver like bnxi2.
>
> - Independent mode : in this mode the adapter takes all the work by
> itself, the network part, it will have it's own IP address and so on, and
> it does not need anything from the OS or the software iSCSI, the
> configuration is made in the BIOS of the adapter, and the connection is
> made before the OS is up.
>
> Does the configuration on oVirt support the two modes? and is there any
> differences when using them, I mean during the setup.
>
> [cut]

Hello,

I've no direct experience, but i suppose that both modes are available, if
they are supported by a standard RHEL machine. In particular the
"Independent mode" should be like said before: you'll see the storage as FC
lun. In the other mode i think is a standard iSCSI setup, but requires the
driver for taking advantage of the offloading.

Luca

-- 
"E' assurdo impiegare gli uomini di intelligenza eccellente per fare
calcoli che potrebbero essere affidati a chiunque se si usassero delle
macchine"
Gottfried Wilhelm von Leibnitz, Filosofo e Matematico (1646-1716)

"Internet è la più grande biblioteca del mondo.
Ma il problema è che i libri sono tutti sparsi sul pavimento"
John Allen Paulos, Matematico (1945-vivente)

Luca 'remix_tj' Lorenzetto, http://www.remixtj.net , <
lorenzetto.l...@gmail.com>
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Re: [ovirt-users] [oVirt4.1] Does oVirt 4.1 support iSCSI offload?

[wodel youchi]

Hi again, and sorry for the delay, I was sick, actually I am still sick
:-(

Just to have more details, from what I have read about iSCSI offload, there
are two modes, depending on the hardware you have (the adapter), using
VMware terminology, no offense :-) , there is :

- Dependent mode : in this mode the adapter still need the software iSCSI
to use the network configuration of the nic port, so the discovery is done
on tcp, the rest on offload driver like bnxi2.

- Independent mode : in this mode the adapter takes all the work by itself,
the network part, it will have it's own IP address and so on, and it does
not need anything from the OS or the software iSCSI, the configuration is
made in the BIOS of the adapter, and the connection is made before the OS
is up.

Does the configuration on oVirt support the two modes? and is there any
differences when using them, I mean during the setup.

Regards.


2017-04-30 7:47 GMT+01:00 Yaniv Kaul :

>
>
> On Sat, Apr 29, 2017 at 7:27 PM, wodel youchi 
> wrote:
>
>> Hi,
>>
>> We have two hypervisors, each one has a 10Gbe nic card with two ports,
>> the cards support iSCSI offload.
>>
>> Does oVirt 4.1 support this?
>>
>
> Yes.
>
>
>> if yes how can someone use it on hosted-engine deployment? the VM engine
>> will be in the SAN targeted by these cards.
>>
>
> Since iSCSI offloading is configured before the OS even loads, to the OS
> (and therefore oVirt hypervisors) it seems that the storage is 'just
> connected' - same as FC for all we care.
>
> Y.
>
>
>>
>> Regards.
>>
>>
>> 
>>  Virus-free.
>> www.avast.com
>> 
>> <#m_8732461098692771785_m_4452747818142096065_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>>
>> ___
>> Users mailing list
>> Users@ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>>
>
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Re: [ovirt-users] [oVirt4.1] Does oVirt 4.1 support iSCSI offload?

[Yaniv Kaul]

On Sat, Apr 29, 2017 at 7:27 PM, wodel youchi 
wrote:

> Hi,
>
> We have two hypervisors, each one has a 10Gbe nic card with two ports, the
> cards support iSCSI offload.
>
> Does oVirt 4.1 support this?
>

Yes.


> if yes how can someone use it on hosted-engine deployment? the VM engine
> will be in the SAN targeted by these cards.
>

Since iSCSI offloading is configured before the OS even loads, to the OS
(and therefore oVirt hypervisors) it seems that the storage is 'just
connected' - same as FC for all we care.

Y.


>
> Regards.
>
>
> 
>  Virus-free.
> www.avast.com
> 
> <#m_4452747818142096065_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
>
> ___
> Users mailing list
> Users@ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
>
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[ovirt-users] [oVirt4.1] Does oVirt 4.1 support iSCSI offload?

[wodel youchi]

Hi,

We have two hypervisors, each one has a 10Gbe nic card with two ports, the
cards support iSCSI offload.

Does oVirt 4.1 support this?
if yes how can someone use it on hosted-engine deployment? the VM engine
will be in the SAN targeted by these cards.

Regards.


Virus-free.
www.avast.com

<#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2>
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