svanderclock wrote:

>> Well...
>>
>> If you don't care about security, you can use a RAM DISK, or even read
>> /dev/rand :)
>>
>>
>
> no i take care about the security, but here the question was to know in "speed" not un reliability the difference between a raid 0 and a raid 1.

In the start of this thread you are asking for a diference in speedu
between Raid 0 and no RAID at all, not between RAID 0 and 1.

No RAID 0 is not twice faster than RAID 1

> is it really twice more faster and in this way really usefull to use it (but in this way the data will need to be backuped or mirrored all the time)
>

And you lose all the speed advantage making the mirroring and back-ups
:) and need to count with your luck to the disk does not crash a second
before the back-up/mirroring starts.

> stephane
>

I am sorry to repeat again, but IMHO RAID-0 is a no go for a database.

--
Alexandre Benson Smith
Development
THOR Software e Comercial Ltda
Santo Andre - Sao Paulo - Brazil
www.thorsoftware.com.br