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EMC Symmetrix DMX-3 Product Guide
Symmetrix DMX-3 Hardware
◆ While all drives (different capacities or different speeds) can be
intermixed in Symmetrix DMX-3 systems, locations on disk
director pairs and drive loops may affect application
performance. Consult your Symmetrix representative for
guidelines on optimal configuration of mixed drive sizes and
speeds.
◆ 5 GB on the first 4 drives of every drive loop (160 GB per disk
director pair) is reserved for memory vaulting.
◆ The first four disk drives on each drive loop in the direct-attached
storage bay support the memory vault devices.
◆ 24 GB of total capacity is reserved for internal Symmetrix File
System (SFS) use.
◆ Symmetrix systems support various data protection methods:
• RAID 1 — Mirrored pairs of two hypervolumes
• RAID 1/0 — Mirroring and striping for open system
environments
• RAID 10 — Data striped across four mirrored pairs of
hypervolumes for mainframe environments
• RAID 5 (3+1) or RAID 5 (7+1) — Data striped on four or eight
hypervolumes with rotating parity
• RAID 6 (6+2) or RAID 6 (14+2) — Data striped on eight or
sixteen hypervolumes with rotating parity
• SRDF — Data mirrored to another Symmetrix
• Dynamic sparing — Increases data availability by copying the
data on a failing volume to a spare volume until the original
device is replaced
• Permanent sparing — Replaces a faulty drive automatically
from a list of available spares residing in the Symmetrix
system without CE involvement on site
Note: Chapter 5, “Data Integrity, Availability, and Protection,” provides
more information and configuration rules regarding the above data
protection options.
◆ Consider details of space, power and installation requirements as
well as planning for future system expansion. Appendix C
“Planning and Installation,” and the EMC Symmetrix DMX-3
Physical Planning Guide provide details on these topics.
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