EMC Symmetrix DMX-3, Product Manual

Page: 189 / 326

Data protection guidelines 189
Data Integrity, Availability, and Protection
Data protection guidelines
The Symmetrix data protection options ensure a higher level of data
protection, recoverability, and availability than the standard
Symmetrix availability and reliability features. The options listed in
Table 28 on page 189 can be purchased separately and implemented
into the Symmetrix operation.
CAUTION
!
To ensure continuous data availability, EMC strongly recommends
that you use one or more of the data protection schemes for your
Symmetrix volumes as described in
Table 28 on page 189 .
Table 28 Data protection options (1 of 2)
Data protection option Description
Mirroring (RAID 1) Provides the highest level of performance and availability for all mission-critical and
business-critical applications by maintaining a duplicate copy of a volume on two disk drives.
“Disk mirroring (RAID 1) concepts” on page 191 contains more information.
Symmetrix RAID 1/0 Provides a combination of RAID 1 and RAID 0 for open systems environments. Data is striped
across mirrored pairs.
“Symmetrix RAID 1/0 for open systems” on page 195 contains additional
information.
Symmetrix RAID 10 Provides a combination of RAID 1 and RAID 0 used for mainframe environments.
“Symmetrix RAID 10 for mainframe systems” on page 196 contains more information.
RAID 5 Provides:
• High performance with automatic striping across hypervolumes
• High availability - lost hypervolumes regenerated from remaining members
RAID 5 is configured in (3+1) and (7+1) groups. RAID 5 technology stripes data and distributes
parity blocks across all the disk drives in the disk array. For more information, refer to
“Symmetrix
DMX RAID 5” on page 198 contains more information.
RAID 6 Supports more than a single disk drive failure. RAID 6 is configured in (6+2) and (14+2) groups.
RAID 6 uses both horizontal parity and diagonal parity.
“Symmetrix DMX RAID 6” on page 206 contains more information.