Symmetrix DMX RAID 5
201
Data Integrity, Availability, and Protection
Figure 44 Writing data in RAID 5 normal mode
Reading data in
RAID 5 normal mode
Read hit operations in a Symmetrix RAID 5 Figure 45 on page 202
normal mode are processed through Symmetrix global memory as in
normal Symmetrix system processing.
Write operation involves two instances
of the read-modify-write sequence.
A four-track stripe of parity
A stripe of four tracks of data
XOR bit mask
Updating parity during writes
Write
Read Read
SYM-000726
Write
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