raid10 vs raid01 type in dmraid

[Gaston, Jason D]

The [man dmraid] page and [dmraid -l] is backwards for RAID10 vs RAID01
as well.  A "10" should be a "stripe on top of mirrors" and a "01"
should be a "mirror on top of stripes".  We should also list "01" as
"RAID01", not "RAID10" in the man page.

See:
http://en.wikipedia.org/wiki/Nested_RAID_levels

Thanks,

Jason


 

>-----Original Message-----
>From: ataraid-list-bounces at redhat.com 
>[mailto:ataraid-list-bounces at redhat.com] On Behalf Of Gaston, Jason D
>Sent: Tuesday, June 19, 2007 3:52 PM
>To: mauelshagen at redhat.com; ATARAID (eg, Promise Fasttrak, 
>Highpoint 370) related discussions
>Subject: raid10 vs raid01 type in dmraid
>
>I think that the array for nested raid levels, in metadata.c, may be
>upside down.  When I build a raid0+1 with Intel or Nvidia (one mirror
>array of two stripe arrays), it is reported as a "raid10" with [dmraid
>-s], this should be "raid01".  If I reverse the nesting to raid10, in
>Intel (one stripe array of two mirror arrays), it is reported as a
>"raid01" with [dmraid -s], this should be "raid10".
>
>Can we just reverse the array in metadata.c?
>
>From:
>static const char *stacked_ascii_type[][5] = {
>	{ "raid10", "raid30", "raid40", "raid50", "raid60" },
>	{ "raid01", "raid03", "raid04", "raid05", "raid06" },
>};
>
>To:
>static const char *stacked_ascii_type[][5] = {
>{ "raid01", "raid03", "raid04", "raid05", "raid06" },	
>{ "raid10", "raid30", "raid40", "raid50", "raid60" },
>	
>}; 
>
>Thanks,
>
>Jason
>
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