[OmniOS-discuss] High Availability storage with ZFS

[Schweiss, Chip]

On Tue, Jan 6, 2015 at 5:16 AM, Filip Marvan <filip.marvan at aira.cz> wrote:

> Hi
>
>
>
> 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 but I never found the way, how to
> successfully configure that on current OmniOS versions.
>
>
>
> 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.   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


>
>
> Thank you,
>
>
>
> Filip Marvan
>
>
>
>
>
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