[Users] Fault tolerant storage

[Jeff Bailey]

On 5/2/2013 5:18 AM, Jakub Bittner wrote:
> Dne 1.5.2013 17:25, Sven Knohsalla napsal(a):
>> Hi Jakub,
>>
>> I assume the solution you are searching for is something GlusterFS 
>> can serve for example:
>> http://www.gluster.org/about/
>>
>> Best, Sven.
>>
>>
>>
>>
>> -----Ursprüngliche Nachricht-----
>> Von: users-bounces at ovirt.org [mailto:users-bounces at ovirt.org] Im 
>> Auftrag von Jonathan Horne
>> Gesendet: Mittwoch, 1. Mai 2013 17:16
>> An: Jakub Bittner; users at ovirt.org
>> Betreff: Re: [Users] Fault tolerant storage
>>
>> I would be surprised if you could do that without your users noticing.
>>
>> It seems like you would be better served to have each storage domain 
>> on a RAID array and rely on the hardware tools of the RAID to handle 
>> disk failure tolerance.
>>
>> Cheers,
>> jonathan
>>
>> -----Original Message-----
>> From: users-bounces at ovirt.org [mailto:users-bounces at ovirt.org] On 
>> Behalf Of Jakub Bittner
>> Sent: Tuesday, April 30, 2013 9:19 AM
>> To: users at ovirt.org
>> Subject: [Users] Fault tolerant storage
>>
>> Hi,
>>
>> would it be possible in near future to use for example 2 attached 
>> DATA storage (iSCSi, or so) as fault tolerant storage?
>>
>> I mean I have two data storage connected to data center and they 
>> include exactly same data and my VMs runs from one and all changes 
>> are mirrored to second like RAID 1 and if one storage fails 
>> everything switch to second storage without user notice?
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> Hi,
>
> thank you for replies.
> Sven:
> I know Gluster. I am using it since 2009 in production but the problem 
> is that many organisations and users already have Storage arrays 
> (SAN,NAS,..) and migrating to Gluster is not possible or reliable.
>

It seems to me that the easiest way to get mirrored storage would be to 
use mirrored LVM logical volumes.  That would require modifications to 
vdsm at least (probably the engine too for management) but certainly 
seems like it would be the easiest/most reliable way.

> While I have 2 storage arrays I would like to use them like network 
> raid 1.  Also the combination of more storage types would be super 
> cool (NFS + ISCSI) or so.
>
> Jonathan:
> Yes, I can rely on disk arrays for hdd fault tolerance, but there are 
> more points of failure than disks (network, ram, cpu, water in rack 
> and so).
>
> To be clear, I know, I can manage fault tolerance by hardware, but it 
> is more expensive
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