If someone knows the answer, please also tell us whether it is the same quality as using the raid0 module to drive two raid1 module arrays. This raid10 module is rather new.

Meanwhile, I found some answers. Here's a document from Novell which discusses the matter, considering the 10, 1+0 and 0+1 variants:

Comparison of RAID10 Option and Nested RAID 10 (1+0) http://www.novell.com/documentation/sles10/index.html?page=/documentation/sl...

(There's a pdf version here: http://www.novell.com/documentation/sles10/pdfdoc/stor_evms/stor_evms.pdf )

It says:

"In mdadm, the RAID10 level creates a single complex software RAID that combines features of both RAID 0 (striping) and RAID 1 (mirroring). Multiple copies of all data blocks are arranged on multiple drives following a striping discipline. Component devices should be the same size."

mdadm module RAID10 uses a Near Layout and a Far Layout on the component disks. The document illustrates those layouts

mdadm RAID10 will be simpler than RAID0 over RAID1 since it only involves one software layer instead of two. Both systems have advantages and disadvantages according to typical use.

Miguel Medalha wrote:

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If someone knows the answer, please also tell us whether it is the same quality as using the raid0 module to drive two raid1 module arrays. This raid10 module is rather new.

Meanwhile, I found some answers. Here's a document from Novell which discusses the matter, considering the 10, 1+0 and 0+1 variants:

Thanks Miguel.

mdadm RAID10 will be simpler than RAID0 over RAID1 since it only involves one software layer instead of two. Both systems have advantages and disadvantages according to typical use.

This makes it a really new software layer in comparison to the raid1 and raid0 modules which have gone through years of production use.

anaconda should understand raid1 and raid0 modes...I wonder why people have problems creating two raid1 md devices and then creating a raid0 md device from the two raid md devices...