Re: md road-map: 2011

[NeilBrown <neilb@suse.de>]

On Wed, 16 Feb 2011 11:21:50 -0300 Roberto Spadim <roberto@spadim.com.br>
wrote:

> since we have the option1 done, why continue with raid1 code? could we
> port write-behind to raid10 code?

No.  write-behind depends on write-mostly, and write-mostly only really makes
sense for RAID1.  I much prefer to keep these two code bases separate.

> another thing, could raid10 work without replica? like a raid0?

Why don't you try it?  Choose a layout that asks for only 1 copy of the data.
It should work.

> 
> why? just to remove many files with the same function (raid1and raid0,
> if raid10 do the same work, many some mdadm changes allow us to
> --level=1 to understand that's raid10 without stripe, --level=0 is
> raid10 without mirrors)

Again, RAID0 has some features that RAID10 doesn'tand cannot.  I suggest you
read man pages (e.g. 'man md') to find out the details.

Also the RAID0 code is much simpler and hence possibly faster.

NeilBrown