10:26 a.m.
Hello All,
I am using NFS as shared storage and is working fine,able
to migrate instances across nodes.
Is it possible to use iscsi backend and achieve the same,a shared
iscsi[i am not able to find a way to do a shared iscsi across hosts]
can some one help with a shared iscsi storage for live migration of vm
across hosts
Thanks
1:01 p.m.
----- Original Message -----
From: "mad Engineer" <themadengin33r(a)gmail.com>
To: users(a)ovirt.org
Sent: Thursday, December 4, 2014 11:26:32 AM
Subject: [ovirt-users] shared storage with iscsi
Hello All,
I am using NFS as shared storage and is working fine,able
to migrate instances across nodes.
Is it possible to use iscsi backend and achieve the same,a shared
iscsi[i am not able to find a way to do a shared iscsi across hosts]
can some one help with a shared iscsi storage for live migration of vm
across hosts
Thanks
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
Hi,
What do you mean by shared iscsi?
if you created a new iSCSI Storage Domain in the Data Center and it is active then all the
hosts should see it while it is Active.
Regards,
Maor
4:23 p.m.
Thanks Maor,in non ovirt kvm setup i use GFS2 to make the block device
shareable across multiple hosts.Could you tell me how is it achieved
in ovirt.
Regards
On Thu, Dec 4, 2014 at 5:31 PM, Maor Lipchuk <mlipchuk(a)redhat.com> wrote:
----- Original Message -----
> From: "mad Engineer" <themadengin33r(a)gmail.com>
> To: users(a)ovirt.org
> Sent: Thursday, December 4, 2014 11:26:32 AM
> Subject: [ovirt-users] shared storage with iscsi
>
> Hello All,
> I am using NFS as shared storage and is working fine,able
> to migrate instances across nodes.
> Is it possible to use iscsi backend and achieve the same,a shared
> iscsi[i am not able to find a way to do a shared iscsi across hosts]
> can some one help with a shared iscsi storage for live migration of vm
> across hosts
>
> Thanks
> _______________________________________________
> Users mailing list
> Users(a)ovirt.org
> http://lists.ovirt.org/mailman/listinfo/users
>
Hi,
What do you mean by shared iscsi?
if you created a new iSCSI Storage Domain in the Data Center and it is active then all
the hosts should see it while it is Active.
Regards,
Maor
4:29 p.m.
Le 04/12/2014 16:23, mad Engineer a écrit :
Thanks Maor,in non ovirt kvm setup i use GFS2 to make the block
device
shareable across multiple hosts.Could you tell me how is it achieved
in ovirt.
When using iSCSI, they are not shared.
You have to make sure your storage infrastructure allows multiple
connection to the iscsi LUN.
But there is nothing to do about sharing on the block level.
When migrating data in iSCSI environement, according to what I've
witnessed, blocks are dd'ed (so this takes time) from the SD source to
target.
I guess that's where glusterfs adds some benefit.
Regards
On Thu, Dec 4, 2014 at 5:31 PM, Maor Lipchuk <mlipchuk(a)redhat.com> wrote:
>
>
> ----- Original Message -----
>> From: "mad Engineer" <themadengin33r(a)gmail.com>
>> To: users(a)ovirt.org
>> Sent: Thursday, December 4, 2014 11:26:32 AM
>> Subject: [ovirt-users] shared storage with iscsi
>>
>> Hello All,
>> I am using NFS as shared storage and is working fine,able
>> to migrate instances across nodes.
>> Is it possible to use iscsi backend and achieve the same,a shared
>> iscsi[i am not able to find a way to do a shared iscsi across hosts]
>> can some one help with a shared iscsi storage for live migration of vm
>> across hosts
>>
>> Thanks
>> _______________________________________________
>> Users mailing list
>> Users(a)ovirt.org
>> http://lists.ovirt.org/mailman/listinfo/users
>>
>
> Hi,
>
> What do you mean by shared iscsi?
> if you created a new iSCSI Storage Domain in the Data Center and it is active then
all the hosts should see it while it is Active.
>
> Regards,
> Maor
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
--
Nicolas Ecarnot
4:30 p.m.
On Thu, Dec 4, 2014 at 4:23 PM, mad Engineer <themadengin33r(a)gmail.com>
wrote:
Thanks Maor,in non ovirt kvm setup i use GFS2 to make the block
device
shareable across multiple hosts.Could you tell me how is it achieved
in ovirt.
Regards
First step the admin guide:
http://www.ovirt.org/OVirt_Administration_Guide
and in particular the Storage chapter and the related iSCSI part:
http://www.ovirt.org/OVirt_Administration_Guide#.E2.81.A0Storage
Also, for multipath in case you need it:
http://www.ovirt.org/Feature/iSCSI-Multipath
HIH,
Gianluca
4:40 p.m.
Thanks Gianluca,it says only NFS is supported as export domain.I
believe export domain is the one i am currently using for live
migrating vms across hosts.So iscsi is not supported,please correct me
if i am wrong.Thanks for your help
On Thu, Dec 4, 2014 at 9:00 PM, Gianluca Cecchi
<gianluca.cecchi(a)gmail.com> wrote:
On Thu, Dec 4, 2014 at 4:23 PM, mad Engineer
<themadengin33r(a)gmail.com>
wrote:
>
> Thanks Maor,in non ovirt kvm setup i use GFS2 to make the block device
> shareable across multiple hosts.Could you tell me how is it achieved
> in ovirt.
>
> Regards
>
First step the admin guide:
http://www.ovirt.org/OVirt_Administration_Guide
and in particular the Storage chapter and the related iSCSI part:
http://www.ovirt.org/OVirt_Administration_Guide#.E2.81.A0Storage
Also, for multipath in case you need it:
http://www.ovirt.org/Feature/iSCSI-Multipath
HIH,
Gianluca
4:58 p.m.
Le 04/12/2014 16:40, mad Engineer a écrit :
Thanks Gianluca,it says only NFS is supported as export domain.I
believe export domain is the one i am currently using for live
migrating vms across hosts.So iscsi is not supported,please correct me
if i am wrong.Thanks for your help
Sorry I did not read you were speaking about _EXPORT_ domain.
Then indeed, you're right, iSCSI is not supported for export domains.
In our case, we are providing some iSCSI LUNs as export domains via the
managers which are serving them as NFS shares.
Performance is OK.
On Thu, Dec 4, 2014 at 9:00 PM, Gianluca Cecchi
<gianluca.cecchi(a)gmail.com> wrote:
> On Thu, Dec 4, 2014 at 4:23 PM, mad Engineer <themadengin33r(a)gmail.com>
> wrote:
>>
>> Thanks Maor,in non ovirt kvm setup i use GFS2 to make the block device
>> shareable across multiple hosts.Could you tell me how is it achieved
>> in ovirt.
>>
>> Regards
>>
>
> First step the admin guide:
> http://www.ovirt.org/OVirt_Administration_Guide
>
> and in particular the Storage chapter and the related iSCSI part:
> http://www.ovirt.org/OVirt_Administration_Guide#.E2.81.A0Storage
>
> Also, for multipath in case you need it:
> http://www.ovirt.org/Feature/iSCSI-Multipath
>
> HIH,
> Gianluca
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
--
Nicolas Ecarnot
5:06 p.m.
On 12/04/2014 12:40 PM, mad Engineer wrote:
Thanks Gianluca,it says only NFS is supported as export domain.
That's right.
I
believe export domain is the one i am currently using for live
migrating vms across hosts.
That's not true. You're not using the Export Domain to support live
migrations. Your VMs are running in a regular Storage Domain (not Export
Domain), probably NFS, and it could be iscsi.
So iscsi is not supported,please correct me
if i am wrong.Thanks for your help
On Thu, Dec 4, 2014 at 9:00 PM, Gianluca Cecchi
<gianluca.cecchi(a)gmail.com> wrote:
> On Thu, Dec 4, 2014 at 4:23 PM, mad Engineer <themadengin33r(a)gmail.com>
> wrote:
>> Thanks Maor,in non ovirt kvm setup i use GFS2 to make the block device
>> shareable across multiple hosts.Could you tell me how is it achieved
>> in ovirt.
>>
>> Regards
>>
> First step the admin guide:
> http://www.ovirt.org/OVirt_Administration_Guide
>
> and in particular the Storage chapter and the related iSCSI part:
> http://www.ovirt.org/OVirt_Administration_Guide#.E2.81.A0Storage
>
> Also, for multipath in case you need it:
> http://www.ovirt.org/Feature/iSCSI-Multipath
>
> HIH,
> Gianluca
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
6:54 p.m.
sorry i am wrong its the data domain that stores virtual disk images,I
have no idea how ovirt shares block device across hosts.Looks like i
need to try that for understanding how its implemented.In case of
vmware they uses vmfs file system for sharing block device among
hosts.I currently have no issues with my NFS shared storage so dont
have any plan to use iscsi,but just curious how the implementation
is.In my existing non ovirt environment,SAN block devices is exported
and its shared using GFS.Is ovirt using any simillar method to achieve
shared block device.
On Thu, Dec 4, 2014 at 9:10 PM, mad Engineer <themadengin33r(a)gmail.com> wrote:
Thanks Gianluca,it says only NFS is supported as export domain.I
believe export domain is the one i am currently using for live
migrating vms across hosts.So iscsi is not supported,please correct me
if i am wrong.Thanks for your help
On Thu, Dec 4, 2014 at 9:00 PM, Gianluca Cecchi
<gianluca.cecchi(a)gmail.com> wrote:
> On Thu, Dec 4, 2014 at 4:23 PM, mad Engineer <themadengin33r(a)gmail.com>
> wrote:
>>
>> Thanks Maor,in non ovirt kvm setup i use GFS2 to make the block device
>> shareable across multiple hosts.Could you tell me how is it achieved
>> in ovirt.
>>
>> Regards
>>
>
> First step the admin guide:
> http://www.ovirt.org/OVirt_Administration_Guide
>
> and in particular the Storage chapter and the related iSCSI part:
> http://www.ovirt.org/OVirt_Administration_Guide#.E2.81.A0Storage
>
> Also, for multipath in case you need it:
> http://www.ovirt.org/Feature/iSCSI-Multipath
>
> HIH,
> Gianluca
7:02 p.m.
On Thu, Dec 4, 2014 at 12:54 PM, mad Engineer <themadengin33r(a)gmail.com>
wrote:
sorry i am wrong its the data domain that stores virtual disk
images,I
have no idea how ovirt shares block device across hosts.Looks like i
need to try that for understanding how its implemented.In case of
vmware they uses vmfs file system for sharing block device among
hosts.I currently have no issues with my NFS shared storage so dont
have any plan to use iscsi,but just curious how the implementation
is.In my existing non ovirt environment,SAN block devices is exported
and its shared using GFS.Is ovirt using any simillar method to achieve
shared block device.
oVirt uses a different approach altogether (this is why it can scale to
clusters with hundreds of hosts, unlike vmware). The idea is pretty simple
1. format the shared block storage with LVM
2. Every VM disk image is an LV
3. manage host access to separate LVs using simple lvchange.
Of course there's much more to the way this is implemented, but very simply
- no two hosts have write access to the same LV, unless it is specified as
a shared disk, so no clustered FS is needed, no scsi reservations are
needed and this concept scales, unlike vmfs, gfs, and other such systems.
On Thu, Dec 4, 2014 at 9:10 PM, mad Engineer <themadengin33r(a)gmail.com>
wrote:
> Thanks Gianluca,it says only NFS is supported as export domain.I
> believe export domain is the one i am currently using for live
> migrating vms across hosts.So iscsi is not supported,please correct me
> if i am wrong.Thanks for your help
>
> On Thu, Dec 4, 2014 at 9:00 PM, Gianluca Cecchi
> <gianluca.cecchi(a)gmail.com> wrote:
>> On Thu, Dec 4, 2014 at 4:23 PM, mad Engineer <themadengin33r(a)gmail.com>
>> wrote:
>>>
>>> Thanks Maor,in non ovirt kvm setup i use GFS2 to make the block device
>>> shareable across multiple hosts.Could you tell me how is it achieved
>>> in ovirt.
>>>
>>> Regards
>>>
>>
>> First step the admin guide:
>> http://www.ovirt.org/OVirt_Administration_Guide
>>
>> and in particular the Storage chapter and the related iSCSI part:
>> http://www.ovirt.org/OVirt_Administration_Guide#.E2.81.A0Storage
>>
>> Also, for multipath in case you need it:
>> http://www.ovirt.org/Feature/iSCSI-Multipath
>>
>> HIH,
>> Gianluca
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
7:03 p.m.
On 12/04/2014 02:54 PM, mad Engineer wrote:
sorry i am wrong its the data domain that stores virtual disk
images,I
have no idea how ovirt shares block device across hosts.Looks like i
need to try that for understanding how its implemented.In case of
vmware they uses vmfs file system for sharing block device among
hosts.I currently have no issues with my NFS shared storage so dont
have any plan to use iscsi,but just curious how the implementation
is.
It's not shared considering the lowest level. Each disk corresponds to a
LVM logical volume, which is activated only on the specific hypervisor
running the VM. Others hypervisors cannot access the logical volume
while the VM is not running on it (except for shared disks). To activate
the logical volume (in order to run the VM), hypervisor runs a "lvchange
-ay vol_group/logical_vol"
In my existing non ovirt environment,SAN block devices is exported
and its shared using GFS.Is ovirt using any simillar method to achieve
shared block device.
On Thu, Dec 4, 2014 at 9:10 PM, mad Engineer <themadengin33r(a)gmail.com> wrote:
> Thanks Gianluca,it says only NFS is supported as export domain.I
> believe export domain is the one i am currently using for live
> migrating vms across hosts.So iscsi is not supported,please correct me
> if i am wrong.Thanks for your help
>
> On Thu, Dec 4, 2014 at 9:00 PM, Gianluca Cecchi
> <gianluca.cecchi(a)gmail.com> wrote:
>> On Thu, Dec 4, 2014 at 4:23 PM, mad Engineer <themadengin33r(a)gmail.com>
>> wrote:
>>> Thanks Maor,in non ovirt kvm setup i use GFS2 to make the block device
>>> shareable across multiple hosts.Could you tell me how is it achieved
>>> in ovirt.
>>>
>>> Regards
>>>
>> First step the admin guide:
>> http://www.ovirt.org/OVirt_Administration_Guide
>>
>> and in particular the Storage chapter and the related iSCSI part:
>> http://www.ovirt.org/OVirt_Administration_Guide#.E2.81.A0Storage
>>
>> Also, for multipath in case you need it:
>> http://www.ovirt.org/Feature/iSCSI-Multipath
>>
>> HIH,
>> Gianluca
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
3436
days inactive
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10 comments
6 participants
participants (6)
-
Amador Pahim -
Dan Yasny -
Gianluca Cecchi -
mad Engineer -
Maor Lipchuk -
Nicolas Ecarnot