raid10 or raid1+0 ?

raid10 or raid1+0 ?

["T. Eichstädt"]

Hallo all,

I have 4 HDDs and I want to use mirroring and striping.
I am wondering what difference between the following two solutions is:

- raid0 on top of 2 raid1 devices (raid1+0)
- directly using the raid10 module

Perhaps someone can give me a hint what the raid10 linux module does in 
difference to the combination of raid1 and raid0.

Another question:
How stable is the raid10 module in the linux kernel. I am currently 
using the debian kernel 2.6.18 but I saw some patches from Neil and 
others for 2.6.21, 2.6.22 regarding the raid10 module. And their 
descriptions sound as if it could be useful to integrate them. when 
using raid10.
Okay, backporting isn't complicated, but nevertheless the number of 
patches makes me feel that raid10 is perhaps not that stable like raid0 
and raid1 ???

Perhaps someone can blow away my fear :)

Best regards
  Thimo Eichstädt

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Re: raid10 or raid1+0 ?

[Justin Piszcz]

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On Mon, 27 Aug 2007, "T. Eichstädt" wrote:

> Hallo all,
>
> I have 4 HDDs and I want to use mirroring and striping.
> I am wondering what difference between the following two solutions is:
>
> - raid0 on top of 2 raid1 devices (raid1+0)
> - directly using the raid10 module
>
> Perhaps someone can give me a hint what the raid10 linux module does in 
> difference to the combination of raid1 and raid0.
>
> Another question:
> How stable is the raid10 module in the linux kernel. I am currently using the 
> debian kernel 2.6.18 but I saw some patches from Neil and others for 2.6.21, 
> 2.6.22 regarding the raid10 module. And their descriptions sound as if it 
> could be useful to integrate them. when using raid10.
> Okay, backporting isn't complicated, but nevertheless the number of patches 
> makes me feel that raid10 is perhaps not that stable like raid0 and raid1 ???
>
> Perhaps someone can blow away my fear :)
>
> Best regards
> Thimo Eichstädt
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html
>

I have a few people who asked me this as well, RAID10 or similiar (SW).  I 
am not so sure, with RAID1 you can have your root disks on it and boot 
from it using LILO/GRUB and it is proven pretty stable; can the same be 
said about RAID10?