RAID-1E Performance

As an addendum to a previous blog entry, I built a RAID-1E array with three identical 500GB disks and ran some benchmarks. As expected, the results fell somewhere in between the pure HDD and RAID-0 performance for both reads and writes.


Version  1.97       ------Sequential Output------ --Sequential Input- --Random-
Concurrency   1     -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine        Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP  /sec %CP
XXXX        23944M   888  96 178362  11 90639   5  5192  88 253139   7 557.7  11
Latency              8913us    4412ms    6268ms   17400us   38206us     764ms    

Therefore, the advantage that it has over a RAID-0 array is the redundancy aspect as a RAID-1E is capable of withstanding a single-disk failure unlike RAID-0. However, performance suffers slightly. It is both faster and safer than a single HDD storage.

Therefore, a RAID-1E configuration is quite useful.

As for how to build a RAID-1E array, just build a RAID-10 array with an odd-number of disks. Useful, when I only have three identical disks.