Consistent Dell raid device names
Solution 1:
Consistency of /dev/sd* device names can not be guaranteed. Full stop.
If you have an application which requires a consistent name, such as actually mounting a filesystem, use its ID or WWN instead. You can find symlinks with consistent names in the /dev/disk/by-id directory which you can use instead of /dev/sd*. (And note that WWNs of a RAID array are virtual and can only be guaranteed unique on the controller to which they're attached.) And the virtual disk UUID can be used in /etc/fstab instead of the device path.