[OmniOS-discuss] High Availability storage with ZFS

[Richard Elling]

> On Jan 6, 2015, at 9:28 AM, Schweiss, Chip <chip at innovates.com> wrote:
> 
> On Tue, Jan 6, 2015 at 5:16 AM, Filip Marvan <filip.marvan at aira.cz <mailto:filip.marvan at aira.cz>> wrote:
> Hi
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>  
> 
> as few guys before, I'm thinking again about High Availability storage with ZFS. I know, that there is great commercial RSF-1, but that's quite expensive for my needs.
> 
> I know, that Sašo did a great job about that on his blog http://zfs-create.blogspot.cz <http://zfs-create.blogspot.cz/> but I never found the way, how to successfully configure that on current OmniOS versions.
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>  
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> So I'm thinking about something more simple. Arrange two LUNs from two OmniOS ZFS storages in one software mirror through fibrechannel. Arrange that mirror in client, for example mdadm in Linux. I know, that it will have performance affect and I will lost some ZFS advantages, but I still can use snapshots, backups with send/receive and some other interesting ZFS things, so it could be usable for some projects.
> 
> Is there anyone, who tried that before? Any eperience with that?
> 
> 
> While this sounds technically possible, it is not HA.  Your client is the single point of failure.   I would wager that mdadm would create more availability issues than it would be solving.   
> 
> I run RSF-1 and HA is still hard to achieve.  

HA: 98% perspiration, 2% good fortune :-)

But seriously, providing HA services is much, much more than just running software.
 -- richard

> I don't think I have gained any additional up-time overcoming failures, but it definitely helps with planned maintenance.   Unfortunately, there are still too many ways a zfs pool can fail that having a second server connected does not help.   
> 
> -Chip
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> Thank you,
> 
>  
> 
> Filip Marvan
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