Problem with sata2 and raid1.

[Erik P. Olsen]

On 13/04/08 16:52, Bruno Wolff III wrote:
> On Sat, Apr 12, 2008 at 15:42:04 +0200,
>   "Erik P. Olsen" <epodata at gmail.com> wrote:
>> I have therefore decided to switch to the software available with Fedora 
>> and would like to know if the data already located on the disks is 
>> accessible to the Fedora driver or if I have to reformat the drives and 
>> install all the enchilada from the beginning? Luckily I have back-up of 
> 
> Not necessarily. The answer may also be different if you try to use
> dmraid support (assuming it exists for your card) and software raid (md).
> 
>> everything and can recreate all data it just takes more time. Another even 
>> more important question is will Fedora drive the disks through the 
>> RocketRaid controller or should I get different hardware and if so which?
> 
> I wouldn't do that as standard wisdom seems to be that unless you go buy
> a real raid card with battery backed cache, you are better off just using
> software raid. Most of the cheap raid cards are using their own propietary
> version fo software raid and when you use it you are tying yourself to
> their hardware. While I haven't made measurements myself, the claim is that
> the amount of cpu off loading you get by using a cheap hardware raid card
> isn't significant.
> 
I suppose I should use dmraid but what about device driver?

-- 
Erik.