[HCoop-Discuss] hardware advice

[Adam Megacz]

Adam Chlipala <adamc at hcoop.net> writes:
> Adam Megacz wrote:
>> You should buy reliable hardware so that this doesn't happen very
>> often.  When it does, the result will be several hours of downtime but
>> (unless somebody drops the ball) less than a day.  And the downtime
>> would only be experienced by those users whose data resided on the
>> failed machine.

> You don't think it's worth replicating enough data that the back-up 
> machine can take over for the main machine immediately, albeit probably 
> starting from an old snapshot?

I do.  Unfortunately AFS doesn't really have support for this ("high
availability" of non-readonly volumes).

You can kinda hack it if you use "network block device" in RAID-1 mode
as the underlying storage for /vicepa, but the performance
implications are unclear.

  - a