[ovirt-users] storage redundancy in Ovirt

[Nir Soffer]

On Sun, Apr 16, 2017 at 4:17 AM Dan Yasny <dyasny at gmail.com> wrote:

> When you set up a storage domain, you need to specify a host to perform
> the initial storage operations, but once the SD is defined, it's details
> are in the engine database, and all the hosts get connected to it directly.
> If the first host you used to define the SD goes down, all other hosts will
> still remain connected and work. SPM is an HA service, and if the current
> SPM host goes down, SPM gets started on another host in the DC. In short,
> unless your actual NFS exporting host goes down, there is no outage.
>

There is no storage outage, but if you shutdown the spm host, the spm host
will not move to a new host until the spm host is online again, or you
confirm
manually that the spm host was rebooted.

Nir


>
> On Sat, Apr 15, 2017 at 1:53 PM, Konstantin Raskoshnyi <konrasko at gmail.com
> > wrote:
>
>> Hi Fernando,
>> I see each host has direct connection nfs mount, but yes, if main host to
>> which I connected nfs storage going down the storage becomes unavailable
>> and all vms are down
>>
>>
>> On Sat, Apr 15, 2017 at 10:37 AM FERNANDO FREDIANI <
>> fernando.frediani at upx.com> wrote:
>>
>>> Hello Konstantin.
>>>
>>> That doesn`t make much sense make a whole cluster depend on a single
>>> host. From what I know any host talk directly to NFS Storage Array or
>>> whatever other Shared Storage you have.
>>> Have you tested that host going down if that affects the other with the
>>> NFS mounted directlly in a NFS Storage array ?
>>>
>>> Fernando
>>>
>>> 2017-04-15 12:42 GMT-03:00 Konstantin Raskoshnyi <konrasko at gmail.com>:
>>>
>>>> In ovirt you have to attach storage through specific host.
>>>> If host goes down storage is not available.
>>>>
>>>> On Sat, Apr 15, 2017 at 7:31 AM FERNANDO FREDIANI <
>>>> fernando.frediani at upx.com> wrote:
>>>>
>>>>> Well, make it not go through host1 and dedicate a storage server for
>>>>> running NFS and make both hosts connect to it.
>>>>> In my view NFS is much easier to manage than any other type of
>>>>> storage, specially FC and iSCSI and performance is pretty much the same, so
>>>>> you won`t get better results other than management going to other type.
>>>>>
>>>>> Fernando
>>>>>
>>>>> 2017-04-15 5:25 GMT-03:00 Konstantin Raskoshnyi <konrasko at gmail.com>:
>>>>>
>>>>>> Hi guys,
>>>>>> I have one nfs storage,
>>>>>> it's connected through host1.
>>>>>> host2 also has access to it, I can easily migrate vms between them.
>>>>>>
>>>>>> The question is - if host1 is down - all infrastructure is down,
>>>>>> since all traffic goes through host1,
>>>>>> is there any way in oVirt to use redundant storage?
>>>>>>
>>>>>> Only glusterfs?
>>>>>>
>>>>>> Thanks
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> Users mailing list
>>>>>> Users at ovirt.org
>>>>>> http://lists.ovirt.org/mailman/listinfo/users
>>>>>>
>>>>>>
>>>
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>>
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