Symmetrix RAID 10 for mainframe systems
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Data Integrity, Availability, and Protection
EMC has observed up to four times improvement in system
performance while using a RAID 10 configuration with four pairs of
disks as compared to an alternative configuration using a single pair
of disks. EMC has also observed 20 percent to 30 percent
improvement in back-end disk performance when DMSP is used,
compared with a situation in which each of the mirrored pair serves
50 percent of the read I/Os. As users move to larger host volume
sizes (3390-27s and eventually 3390-54s), the requirement for
PAV/MA will accelerate. This allows for simultaneous access to
different tracks (even the same track if all accesses are reads) on the
same logical volume at the same time (even within the same stripe).
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