Raid Performance Shootout - Observed values for Hardware Raid-5 vs Raid-10

Sonya
Sonya
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Raid Performance Shootout - Observed values for Hardware Raid-5 vs Raid-10

Observed values for Hardware Raid-5 and Raid-10. Raid-5 vs Raid-10. Which one is better? Cost-effective servers for virtualized environment.

When considering server performance, Raid is the most common way to achieve disk subsystem performance. When you are on a budget, the choices are very limited. But isn't that when your creativity hits the roof?

We needed cost-effective servers for virtualized environment. So we ran some hard drive benchmarks to see what we can extract.

We could use iometer or some other better mechanism of testing. But we simply wanted a quick and simple test.

So here are some numbers:

Normal Disk (No Raid)
Disk Read:56 MB/sec
Disk Write:52 MB/sec
Raid-5
Disk Read:138 MB/sec
Disk Write:117 MB/sec
Raid-10
Disk Read:119 MB/sec
Disk Write:106 MB/sec

Note that on first look Raid-5 appears to offer the best performance on this system. Let's see if this holds true in a more realistic scenario. For further testing we started two threads, one reading and another writing. However they started one after another. Here are the numbers:

Raid-5 (write thread started first)
Disk Read:46 MB/sec
Disk Write:78 MB/sec
Raid-5 (read thread started first)
Disk Read:38.3 MB/sec
Disk Write:84.2 MB/sec
Raid-10 (write thread started first)
Disk Read:54.7 MB/sec
Disk Write:108 MB/sec
Raid-10 (read thread started first)
Disk Read:56 MB/sec
Disk Write:103 MB/sec

Now how about read performance with two threads:

Raid-5 – Concurrent Reads
Thread 1:53.0 MB/sec
Thread 2:59.7 MB/sec
Raid-10 – Concurrent Reads
Thread 1:117 MB/sec
Thread 2:111 MB/sec

Looking at these numbers, it is reasonable to conclude that Raid-10 offers a much more consistent performance with concurrent disk activity. Although these numbers do not consider all the situations however they consistently work for us.

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