F7 software RAID docs?

Neal Becker ndbecker2 at gmail.com
Thu Aug 9 13:13:58 UTC 2007


Bruno Wolff III wrote:

> On Sun, Aug 05, 2007 at 21:42:01 -0700,
>   Dave Stevens <geek at uniserve.com> wrote:
>> Hello all,
>> 
>> I'm thinking about a software RAID (0)  setup for my next system revision
>> and am curious where this occurs in (I assume) the system setup. Can
>> anyone point me to documentation on this?
> 
> You can do a custom disk layout during install. It isn't too hard to
> figure out do a raid 0 install, though choosing good values for chunking
> might take some guesswork.
> 
> What are you going to be doing that makes you think raid 0 is desirable?
> For modern home machines with lots of memory, this probably isn't going to
> give you much of a speed up in typical use. It will make the chances of
> your file system being lost because of a hardware problem, about double.
> Raid 1 or 10 seem to be more useful for home users, than raid 0.
> 

No!  If the prob of failure during an interval T is pf, the prob of failure
for an array of 2 drives during T is 1 - (1-pf)^2.




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