<<< SSAG::DISK$ARCH2:[NOTES$LIBRARY.SSAG]ASK_SSAG.NOTE;32767 >>> -< Ask the Storage Architecture Group >- ================================================================================ Note 6530.4 How mirror set redundancy is maintained under hardware mirr 4 of 4 AMCFAC::RABAHY "dtn 471-5160, outside 1-810-347-5160" 9 lines 2-APR-1997 06:28 -------------------------------------------------------------------------------- Neat. It is still 2N and no small write penalty. Still not atomic without a wbc when done at the controller. Someone ought to look at doing this at the host. Recovery requires an extra spindle but that's a mixed blessing -- it spreads the load but could thrash against application I/O more. For even numbers, is the traditional pairing superior? For odd numbers larger than 3, would a hybred be interesting? My idea would be to form all pairs and one set of 3 with the staggered layout.