[OmniOS-discuss] Highly Available ZFS

[Schweiss, Chip]

On Mon, Jun 29, 2015 at 1:52 PM, Michael Rasmussen <mir at miras.org> wrote:

> Does anybody have an idea of how Nexenta does their HA-setup?
>
> My guess is that it must involve something with a constant snapshot of
> the pool using zfs send combined with forced import.
>

Nexenta uses RSF-1 from HighAvailability.com.  It is dual servers connected
to SAS devices.  Pools are exported either gracefully or by force on one
host and imported on the other.   A floating IP address allows the clients
to maintain connectivity.

I use RSF-1 with OmniOS.   It works well, but HA in general has a steep
learning curve and A LOT of gotchas that are not well documented anywhere.

It took me about a year of learning until HA started actually increasing my
storage availability.  The price of RSF-1 is well justified if you don't
have a lot experience with HA on ZFS.   Eventually I will attempt HA
without it, but in the mean time it is serving me well.

-Chip


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> Michael Rasmussen
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