Maintaining data integrity
175
Data Integrity, Availability, and Protection
Maintaining data integrity
The Symmetrix DMX systems preserve data integrity by performing
extensive error checking and correction on all data and addresses that
it passes internally. The Symmetrix DMX architecture provides the
most reliable hardware design in the industry. However, all hardware
is subject to the effects of aging and occasional failures. The unique
methods used by Symmetrix DMX systems for detecting and
preventing these failures in a proactive way set it apart from all other
storage solutions in providing continuous data integrity and high
availability. The Symmetrix system is designed with these data
integrity features:
◆ “Remote support” on page 175
◆ “Error Checking and Correction, and data integrity protection”
on page 176
◆ “Disk error correction and error verification” on page 177
◆ “Global memory director data integrity logic” on page 178
◆ “Global memory error correction and error verification” on
page 178
◆ “Global memory chip-level redundancy” on page 179
◆ “Redundant global memory” on page 179
◆ “Longitude redundancy code (LRC)” on page 179
◆ “Byte-level parity checking” on page 179
◆ “Global memory access path protection” on page 180
Remote support
Remote support is an important and integral part of EMC Customer
Support. Every Symmetrix unit has an integrated service processor
that continuously monitors the Symmetrix environment. The service
processor can communicate with the EMC Customer Support Center
through a customer-supplied direct phone line. Through the service
processor, the Symmetrix system actively monitors all I/O operations
for errors and faults. By tracking these errors during normal
operation, the Symmetrix system can recognize patterns of error
activity and predict a potential hard failure before it occurs. This
proactive error tracking capability can often prevent component
failures by fencing off, or removing from service, a suspect
component before a failure occurs. The “call home” capabilities allow
the Symmetrix system to automatically notify EMC Customer
Support of potential issues before a failure actually occurs. An EMC
Product Support Engineer handles these calls and can dispatch a local
Customer Engineer to install a new component without disrupting
access to data.
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