4
Principled Technologies, Inc.: Dell 6Gbps vs. 3Gbps RAID controller performance comparison
What we found
We report the IOPS results of our custom Iometer tests. For the large block access specifications in the external
RAID controller testing, we report the MB/s results. For all tests, higher IOPS and MB-per-second numbers are
better. We ran each test three times and report results from the run that produced the median of the three I/O-per-
second results.
We calculated the average percentage wins for each access specification by averaging the performance gain
percentage of all of the RAID levels we tested.
Internal HDD tests
Figure 6 displays the Dell PERC H700 percentage improvement in IOPS performance over the Dell PERC 6/i.
The Dell PERC H700 delivered an average performance increase ranging from 2.2 percent to 56.3 percent.
Internal HDD test
access specifications
and block size
Dell PERC H700
percentage win in
IOPS over Dell
PERC 6/i RAID 5
Dell PERC H700
percentage win in
IOPS over Dell
PERC 6/i RAID 10
Dell PERC H700 average
percentage win in IOPS
over Dell PERC 6/i
across both RAID 5 and
RAID 10
DB OLTP 8K 0.1% 4.3%
2.2%
Web file server 4K 18.9% 28.6%
23.8%
Web file server 8K 20.8% 29.8%
25.3%
Web file server 64K 13.9% 15.1%
14.5%
Web server log 8K 77.1% 35.4%
56.3%
Figure 6: The Dell PERC H700 percentage improvement in IOPS performance over the Dell PERC 6/i. Higher numbers are better.
Internal SSD tests
For the internal SSD tests, we focused on performance gains from access specifications that contain random as
well as write activity. Compared to the Dell PERC 6/i, the Dell PERC H700 RAID controller had significant
performance improvements in all of the specifications we tested. The Dell PERC H700 yielded average
performance gains across RAID levels 0 and 10 ranging from 8.1 percent to 41.8 percent.
Figure 7 displays the results from our internal SSD tests.
Internal SSD test
access specifications
and block size
Dell PERC H700
percentage win in
IOPS over Dell PERC
6/i RAID 0
Dell PERC H700
percentage win in
IOPS over Dell PERC
6/i RAID 10
Dell PERC H700 average
percentage win in IOPS
over Dell PERC 6/i
across both RAID 0 and
RAID 10
DB OLTP 8K 28.4% 25.5%
26.9%
Exchange 4K 30.3% 26.1%
28.2%
Exchange 8K 28.4% 25.2%
26.8%
Exchange 64K 11.2% 5.0%
8.1%
OS drive 8K 27.8% 25.5%
26.6%
Web file server 4K 42.8% 40.8%
41.8%
Web file server 8K 40.2% 39.3%
39.8%
Web file server 64K 33.4% 22.5%
27.9%
Figure 7: Access specification results from our internal SSD tests showing Dell PERC H700 improvement over the Dell PERC 6/i.
Higher numbers are better.
(27 Seiten)
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