<<< SSAG::DISK$ARCH2:[NOTES$LIBRARY.SSAG]ASK_SSAG.NOTE;32767 >>> -< Ask the Storage Architecture Group >- ================================================================================ Note 6530.0 How mirror set redundancy is maintained under hardware m 4 replies OSOV03::KAGEYAMA "Trust, but Verify" 25 lines 31-MAR-1997 00:33 -------------------------------------------------------------------------------- I've heard under hardware mirroring data redundancy is maintained in somewhat strange method as I know under OpenVMS volume shadowing software. What I heard is, if I have 4 member mirror set, each member has following cyclic redundancy. mem1 mem2 mem3 mem4 A B C D - - - - D' A' B' C' ' is copy of original data Total capacity is half of all member disks for redundancy. It's same with host base shadowing. But there's no same member disk if one of member disks would be lost, although data redundancy is held absolutely. Is this true? If so which hardware mirroing implement this kind of method? Mylex? HSOF? Can I have odd number of mirror set member? - Kazunori