Re: [OpenAFS] HA RW vols

2012-04-04 Thread Arne Wiebalck
Am 3. April 2012 19:06 schrieb Ken Dreyer :
> On Mon, Apr 2, 2012 at 12:06 PM, Jeff Blaine  wrote:
>> What have people had success with (existing solutions
>> in practice) for making RW volumes "highly available"?
>
> We have some content in AFS where it's acceptable to have a little bit
> of downtime, but we need to be able to recover with a minimum of
> hassle if we had an outage. In these cases, we mount the volumes
> explicitly as rw, but replicate them "behind the scenes" in cron. We
> can then use vos convertROtoRW if we need to quickly recover.
>
> It has its downsides, and it's not true multi-master RW, but it works
> in a pinch.
>
> - Ken

We use 'vos shadow' in a similar fashion as described by Ken: the RW
volume is shadowed at regular intervals and can be switched to in case
the main volume is not available.

Cheers,
 Arne
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Re: [OpenAFS] HA RW vols

2012-04-03 Thread Ken Dreyer
On Mon, Apr 2, 2012 at 12:06 PM, Jeff Blaine  wrote:
> What have people had success with (existing solutions
> in practice) for making RW volumes "highly available"?

We have some content in AFS where it's acceptable to have a little bit
of downtime, but we need to be able to recover with a minimum of
hassle if we had an outage. In these cases, we mount the volumes
explicitly as rw, but replicate them "behind the scenes" in cron. We
can then use vos convertROtoRW if we need to quickly recover.

It has its downsides, and it's not true multi-master RW, but it works
in a pinch.

- Ken
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[OpenAFS] HA RW vols

2012-04-02 Thread Jeff Blaine

What have people had success with (existing solutions
in practice) for making RW volumes "highly available"?
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