)   Software and Hardware RAID, Shadowing?    The Question is:    O I have an Alpha 4100 with two external shelves of 18.2 GB drives ( 12 total)and J  kzpba-ca controllers. I want to create RAID5 raid sets using Compaq RAID5N  V2.5. O/S is 6.2 1H3. Question: can I use disks across controllers as part of  a raid group ( disks onQ  shelf 1 and shelf 2) or do need to keep the RAID devices on the same controller?   The Answer is :   B   Host-based RAID solutions including HP RAID Software for OpenVMSB   (which provides RAID0 and RAID5) and HP OpenVMS Volume ShadowingE   (RAID0+1) (and the two products can operate together) can typically D   operate across controllers, while controller-based (hardware) RAID   solutions typically cannot.    F   For details of the particular package, please consult the associated   documentation.   F   As of this writing, V2.6 is the current HP RAID Software for OpenVMS
   release.   F   Both HP RAID Software for OpenVMS and HP OpenVMS Volume Shadowing doD   operate across controllers.  Both products also can and do operateE   across multiple cluster hosts as well, assisting in the creation of *   disaster-tolerant OpenVMS configurations   /  Answer written or last revised on  6-MAY-2004  