Am 09.02.2012 20:44, schrieb Luis Motta Campos:
> On 9 Feb 2012, at 20:07, Reindl Harald wrote:
>> Am 09.02.2012 20:01, schrieb Luis Motta Campos:
>>> easily measurable return of investment than a (usually painful) migration to
> SAN
>>
>> what is painful in migration to a SAN?
>>
>> SAN storage will be mostly faster since modern
>> devices having 1 GB buffers in front, your
>> physical disk not and yes it is a hughe different
>> between OS-chacing/buffering and dedicated hardware
>>
>> these days you can use VMware vSphere with dedicated SAN storages
>> and failover with better performance as most physical installations
>> with local storage
>
>
> NEVER EVER THINK about running Databases on Virtualization Engines.
the real life shows no problems over years
you only need to buy the right hardware
> Abou the pains of SAN migration: (A) downtime, of a sort you cannot control
which downtime?
replication anywhere?
> and cannot avoid by failing over from a master database to some replication slave
why do you believe this?
> (B) expensive scalability - if you're facing issues with the size of your data you
> will be looking for ways to scale up your database cluster soon, and SANs are
> expensive
> to scale up
this is not a technical problem
> (C) completely different infra-structure for your data-centre
> a SAN unit will force you to rethink the way you organize your
> database boxes in the data centre
but where is te problem?
> and this is painful, specially if you have been growing organically for a long time.
not if it is done right
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