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ADAC Ultra2 S466 Hardware Guide
24
RAID 3, Continued
RAID 5 vs RAID 3 You may find that RAID 5 is preferable to RAID 3 even
for applications characterized by sequential reads and
writes, because ADAC Ultra2 S466 has very robust
caching algorithms.
The benefits of RAID 3 disappear if there are many small
I/O operations scattered randomly and widely across the
disks in the logical drive. The RAID 3 fixed parity disk
becomes a bottleneck in such applications. For example:
The host attempts to make two small writes and the writes
are widely scattered, involving two different stripes and
different disk drives. Ideally both writes should take place
at the same time. But this is not possible in RAID 3, since
the writes must take turns accessing the fixed parity drive.
For this reason, RAID 5 is the clear choice in this scenario.