JBOD, at the logical level combines physical disk drives into one larger drive. This comes in handy when dealing with an assortment of drives. Where RAID configuration combines drives at the limit of the smallest disk, JBOD does not.

Starting with the Reader tests, IOZone places a file on the system and measures the performance of reading that file. With larger record sizes and smaller file, we peak at 50MB/s, although a more consistent result would be in the low 30s.

Next, the Re-Reader test measures the system’s caching ability. While it is typical that Re-Reader results are significantly higher than those reported in the Reader test as the test measures reading performance of a file that was previously read, the effects are insignificant with larger file sizes. If we attempted this with files in the few hundred KB mark, we would see a larger jump.

The Writer test measures performance of writing a new file to the system. Our first write performance scales from 5MB/s up to the low 50′s. We average out at 27.8MB/s read and 28.4MB/s re-read.

When writing a previously written file, the overhead required to process where data will be stored on a specific storage media is already determined; the system in a sense is required to do less, thus accounting for the vast improvement in performance. The average write speed across the test is 20.2MB/s write and 62MB/s re-write.

Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15