Raid change procedure

There is no direct direct migration ability, so I would clone the raid 1 to a cheap SATA drive (after running chkdsk and patrol reads on the source raid 1), create the raid 10, then reverse clone the SATA drive to the raid 10. Backup first, if you have startup problems due to  drive letter changes, run OS dependant Fdisk /mbr or FIXMBR. Acronis does a nice job of cloning, but it's price is painful.

If it is just a data array, a simple TBU backup and restore will suffice.

No direct migration....

https://selfservice.lsi.com/service/main.jsp?t=solutionTab&ft=searchTab&ps=solutionPanels&locale=en_US&_dyncharset=UTF-8&curResURL=%2Fservice%2Fmain.jsp%3F_dyncharset%3DUTF-8%26_dynSessConf%3D-361891329989126223%26t%3DsearchTab%26dosearch%3Dtrue%26locale%3Den_US%26_dyncharset%3DUTF-8%26searchstring%3Draid%252bmigration%26focusTopic%3D%26topicName%3D%26useFocusTopic%3Dtrue&solutionId=3139&isSrch=Yes

The Array being converted is data only.

Can I break the mirror without destroying the data? 

If so, could I

1. break the mirror,

2. Convert the primary drive to a stripe set,

3. Copy the Mirror to the new primary set,

4. convert the mirror to a stripe set, then

5. remirror the primary set?

Everything is backed up to tape.

Fact that it is data volume does make easier.

Raid 1 and raid 10 are two different configurations. You can not create a raid 1, and form a mirror with another raid 1 drives to produce raid 10, except if you did it through the OS with dynamic disks and you DO NOT want to do this with a hardware raid. Safest is to get a SATA drive involved and copy the data over with an executable which will preserve file/directory permissions; bit more dangerous, restore from tape.

Are you saying I have to delete the raid1 then add the new drives and to straight to raid10?

Exactly, if you check the raid migration link I posted, there is no migration from an r1 to an r10, unless your blessed with a miracle.