Are you familiar with GlusterFs / Ceph ?
Eero
19.11.2015 8.34 ip. "Lamar Owen" <lowen@xxxxxxxx> kirjoitti:
> On 11/18/2015 04:42 PM, John R Pierce wrote:
>
>> the /really/ hard one when rolling your own highly redundant systems with
>> high data integrity needed for things like transactional database servers,
>> is implementing redundant storage controllers with shared writeback
>> cache... you pretty much have to get into EMC class hardware for this
>> level of reliability with data integrity and performance. and thats
>> /really/ expensive stuff.
>>
> Yes it is, because it really is that hard to do shared writeback cache.
> EMC, Nimble, NetApp, and the like cost what they do because of those HA
> features. EMC storage processors have specialized shared backplanes and
> replicated write caches just in case an SP goes down while the data to be
> written is in cache and has yet to be committed (so that the trespassing SP
> can write the correct data to disk). They also have dedicated battery
> backup units and the whole concept of the 'vault' drives to specifically
> save the write cache in a powerfail emergency.
>
> But I would love to see something in the free software space that did that
> kind of thing, with appropriate hardware.
>
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