Thank you, as far as I can tell it works,

[EMAIL PROTECTED]:/# dmraid -r
/dev/sdd: isw, "isw_jceibccac", GROUP, ok, 976773165 sectors, data@ 0
/dev/sdc: isw, "isw_jceibccac", GROUP, ok, 976773165 sectors, data@ 0
/dev/sdb: isw, "isw_jceibccac", GROUP, ok, 976773165 sectors, data@ 0
/dev/sda: isw, "isw_jceibccac", GROUP, ok, 976773165 sectors, data@ 0
[EMAIL PROTECTED]:/# ls -l /dev/mapper/isw_jceibccac_Volume0
brw-rw---- 1 root disk 254, 2 Dec  5 19:17 /dev/mapper/isw_jceibccac_Volume0
[EMAIL PROTECTED]:/# ls -l /dev/mapper/isw_jceibccac_Volume0
isw_jceibccac_Volume0    isw_jceibccac_Volume0-1  isw_jceibccac_Volume03   
isw_jceibccac_Volume06   
isw_jceibccac_Volume0-0  isw_jceibccac_Volume01   isw_jceibccac_Volume05   
[EMAIL PROTECTED]:/# fdisk /dev/mapper/isw_jceibccac_Volume0

The number of cylinders for this disk is set to 121602.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
   (e.g., DOS FDISK, OS/2 FDISK)

Command (m for help): p

Disk /dev/mapper/isw_jceibccac_Volume0: 1000.2 GB, 1000210694144 bytes
255 heads, 63 sectors/track, 121602 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x7e7498c6

                             Device Boot      Start         End      Blocks   
Id  System
/dev/mapper/isw_jceibccac_Volume0p1   *           1       31871   256000000    
7  HPFS/NTFS
/dev/mapper/isw_jceibccac_Volume0p2           31871       97142   524292091    
5  Extended
/dev/mapper/isw_jceibccac_Volume0p3           97143      121602   196474950   
83  Linux
/dev/mapper/isw_jceibccac_Volume0p5           31871       31936      524864+  
83  Linux
/dev/mapper/isw_jceibccac_Volume0p6           31937       90681   471869181   
83  Linux


-----------------
I did not test mounting and read/write, because I did a chroot.  But I assume 
if it found it ok then the mapper works.

Is it possible debian would use this patch?  (If I go to debian one day)

Thank you for your help with this issue Giuseppe and Phillip, much
appreciated.  Raid 10 is a cheaper alternative if you want mirroring and
striping without raid 5 xor/parity hardware/cpu usage.  I'm quite
satisfied with it.

-- 
dmraid rc15 isw raid 10 "could not find disk in metadata"
https://bugs.launchpad.net/bugs/305011
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