Re: [PATCH/RFC] Linux MTD striping middle layer

Alexander Belyakov
2006-03-22T16:26:20Z

Vitaly Wool wrote:
> May I ask why at all you need to add a new mechanism for striping iso,
> say, modifying mtdconcat? Thanks!
>
> Vitaly

Vitaly,

as I have already said concatenation is like JBOD in the world of hard
drives. JBOD means "just a bunch of disks". Meanwhile striping is like
RAID level 0. As you may know JBOD and RAID0 are completely different.
Concatenation and striping have only one common thing - each of them
makes larger devices. That's all. All the rest are different including
new device parameters, writing, reading, erasing routines. Note, that
concatenation layer writes/erases/etc from the caller thread, meanwhile
striping layer do this from several separate threads, splitting
operations by special algorithm.

Moreover the idea is different. Concatenation only purpose is to make
larger device from several smaller devices. Striping purpose is to make
devices operate faster.

Thanks,
Alexander Belyakov