[Glass] High Availability in GemStone

[Dale Henrichs]

Bruno,

We plan on writing some example scripts for handling the mechanics of
switching over to standby stone, but anything beyond that is really
dependent upon your hardware configuration and your definition of failure
...

we'll share the script with you when we get one put together.

I believe that daemontools was mentioned because it can be used to detect
that a process is no longer running ... it is very useful for "instantly
_restarting_" gems, but I'm not sure that it could be used in this case
unless you wanted to simply restart the stone process ...

Regarding the virtual node copying technology ... I don't think the
technology has reached the point where such copying is feasible:) For a
small enough installation it might work, but if you have a sizable amount
of disk and memory that needs to be copied and synchronized atomically at
each write??? I think that running processes can be migrated from one
machine to another, but IIRC the processing is stopped for the duration of
the copy ... so not practical as a hot standby option (yet).

Dale


On Thu, Feb 20, 2014 at 1:59 PM, BrunoBB <smalltalk at adinet.com.uy> wrote:

> James,
>
> Let suppose that a company has a VM Ware virtual datacenter with lot of
> Linux running on it.
>
> Let say Node-1 is the master and Node-2 slave, and Node-1 is copied (at
> VMWare level, maybe at memory level) to Node-2.
>
> If Node-1 crash then Node-2 take the requests. If it is possible at VWare
> level maybe it needs some GemStone configuration or not ?
>
> (i do not know if it possible i will found out with a VM Ware
> administrator)
>
> If this is possible then we have "traslated the problem" to the datacenter
> administrator :)
>
> Regards,
> Bruno
>
>
>
> --
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