Status of Linux MD RAID 10? (Or: Why is it still marked experimental?)

Status of Linux MD RAID 10? (Or: Why is it still marked experimental?)

[Eric MSP Veith]

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Hello list,

I'm using Linux' MD feature with two RAID 1 arrays and am pretty happy with it.
Since I'm planning to change my disk layout, I'd like to switch to RAID level
10. But when configuring current 2.6.33 stable kernel, I found RAID 10 marked
experimental.

Why is this that case?

I normally do not tend to ignore the "EXPERIMENTAL" warning; in fact, my
current "home server" kernel does not include any single item marked as
experimental.

I've googled around before bugging the ML and found several others asking
questions along the line "can I use MD RAID 10 right now?", with answers like
"it works for me so far." I, on the contrary, would like to know what issues
prevent RAID 10 from getting the "experimental" KConfig tag removed.

TIA!

            Eric
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Re: Status of Linux MD RAID 10? (Or: Why is it still marked experimental?)

[Neil Brown]

On Thu, 22 Apr 2010 11:17:51 +0000
Eric MSP Veith <eveith@wwweb-library.net> wrote:

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> Hash: SHA1
> 
> Hello list,
> 
> I'm using Linux' MD feature with two RAID 1 arrays and am pretty happy with it.
> Since I'm planning to change my disk layout, I'd like to switch to RAID level
> 10. But when configuring current 2.6.33 stable kernel, I found RAID 10 marked
> experimental.
> 
> Why is this that case?

I just never got around to removing it.
I will submit a patch for 2.6.35 to remove the EXPERIMENTAL designation (it
is too late to bother for 2.6.34).

Thanks,
NeilBrown

> 
> I normally do not tend to ignore the "EXPERIMENTAL" warning; in fact, my
> current "home server" kernel does not include any single item marked as
> experimental.
> 
> I've googled around before bugging the ML and found several others asking
> questions along the line "can I use MD RAID 10 right now?", with answers like
> "it works for me so far." I, on the contrary, would like to know what issues
> prevent RAID 10 from getting the "experimental" KConfig tag removed.
> 
> TIA!
> 
>             Eric
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> iEYEARECAAYFAkvQMF4ACgkQhS0drJ3goJIOwQCffOtkGCs57p5dyYu6pcQdgpyp
> KcsAn0MRkm9ShMFNwGKgAY4fe2hFuB0c
> =08wl
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