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Principled Technologies, Inc.: Dell 6Gbps vs. 3Gbps RAID controller performance comparison

What we tested

Iometer

Iometer measures input/output (I/O) on single and clustered systems. Iometer performs I/O operations on a

system in order to stress the system, and then records the performance of and system stress created by these I/O

operations. Iometer can create and measure workloads on a single system or on networked systems. We used

Iometer version 2006.07.27 on a Dell PowerEdge R710 to simulate a file server workload on the RAID controllers

and corresponding storage. We used the same Iometer workload across all hardware configurations but tuned the

number of outstanding I/Os to obtain the maximum possible Input/Output Operations Per Second (IOPS) on the

controller with the best performance for each of the three sets of hardware comparisons being made: the 6Gbps

vs. 3Gbps internal RAID controllers with hard disk drives, the 6Gbps vs. 3Gbps internal RAID controllers with

solid state drives, and the 6Gbps vs. 3Gbps external RAID controllers with storage arrays. Figure 5 displays the

details on the Iometer access specifications we used. We present the number of outstanding I/Os and other

specific settings we used during testing in Figure 10 of the Test configurations section.

Access specification name and

block size

Percentage

read

Percentage

write

Percentage

random

Percentage

sequential

DB OLTP 8K 70% 30% 100% 0%

DSS 1M 100% 0% 100% 0%

Exchange email 4K 67% 33% 100% 0%

Exchange email 8K 67% 33% 100% 0%

Exchange email 64K 50% 50% 100% 0%

Media streaming 64K 98% 2% 0% 100%

OS drive 8K 70% 30% 100% 0%

OS paging 64K 90% 10% 0% 100%

SQL server log 64K 0% 100% 0% 100%

Video on Demand 512K 100% 0% 100% 0%

Web file server 4K 95% 5% 75% 25%

Web file server 8K 95% 5% 75% 25%

Web file server 64K 95% 5% 75% 25%

Web server log 8K 0% 100% 0% 100%

Figure 5: Description of access specification settings.

For more information about Iometer, see http://www.iometer.org/

Testing overview

We used a Dell PowerEdge R710 server to test the Iometer workload on all RAID controllers paired with

corresponding storage.

First, we compared the performance of an internal Dell PERC 6/i 3Gbps RAID controller against an internal Dell

PERC H700 6Gbps RAID controller at RAID levels 5 and 10 for HDD tests, and RAID levels 0 and 10 for SSD

tests. The corresponding storage for testing the internal RAID controllers were six 6Gbps 73GB 15K SAS HDDs

or, for SSD testing, six 3Gbps 50GB SSDs.

We then compared the performance of an external Dell PERC 6/E 3Gbps RAID controller against an external Dell

PERC H800 6Gbps RAID controller at RAID levels 0, 5, 6, and 10. We used three Dell PowerVault MD1120 drive

arrays with a total of 72 6Gbps 15K SAS HDDs (24 73GB drives and 48 146GB drives) to test the Dell PERC 6/E,

and three Dell PowerVault MD1220 drive arrays, also with a total of 72 6Gbps 15K SAS HDDs (24 73GB drives

and 48 146GB drives), to test the Dell PERC H800. We present the details on the 16 hardware configurations we

used for testing in the Test configuration section below.

1 2 3 4 5 6 7 8 ... 16 17

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