iXBT Labs - Computer Hardware in Detail

Platform

Video

Multimedia

Mobile

Other

Western Digital Drives in RAID1 Array

November 23, 2003



To complete our discussion about the WD2500JD and WD360GD drives let's test the RAID1 arrays based on these drives.  Actually these tests are of just cognitive interest as I can hardly imagine a person who could decide to mirror such discs. Just because there's no practical use of it I tested only the SATA drives as both the interface and the controller are relatively new. 

Tests

Testbed.

  • Mainboard - Iwill WO2-R (BIOS ver. 6.00PGN);
  • CPU - Intel Pentium III 800EB;
  • Memory - 256 MB PC133 SDRAM;
  • System disc - IBM DTLA 307015;
  • SATA RAID controller - Iwill IS150 (Silicon Image SataLink SiI3112,BIOS Ver. 4.2.0.0, Driver Ver. 1.0.0.22)
  • OS - Windows 2000 Professional SP4.

The test suite is standard.

  • Ziff-Davis WinBench 99;
  • Intel IOMeter.

Ziff-Davis WinBench 99 

As expected, the results haven't changed. The linear read diagrams can be found here.

Like in case of the distributed array, the access time of the WD360GD is a bit better.

The Disk WinMarks look worse for the mirrors - there must be no cheats in mirroring at all.

Intel IOMeter

Mirroring doesn't affect scores of the WD2500JB, but in case of the WD360GD the array's performance looks better than that of the single drive as the load grows up. The matter is that data can be read from any of two array discs. And such effect results from the small volume and high speed of rotation.

This diagram proves it.


The WD360GD has quite strange scores in the random writing test - the character of the diagrams looks too different.

In the Database patterns with various relations of read/write requests the array of two WD360GD looks completely different from the single disc. The advantage of mirroring is that data are read from a more appropriate disc.

Now come the serial modes. The disc gets requests for reading or writing of data blocks the size of which gradually grows up. The queue depth equals 4 (very light).

The single WD2500JD and the array have very close scores, in contrast to the WD360GD.

The scores for the mirrors of the WD360GD and WD2500JD look similar at writing.

Conclusion

The mirror of two WD2500JD performs similarly to the single disc (except for the slower serial writing). The array built on the WD360GD behaves differently both at writing and reading.
  


Nikolai Dorofeev (niko@ixbt.com)

Write a comment below. No registration needed!


Article navigation:



blog comments powered by Disqus

  Most Popular Reviews More    RSS  

AMD Phenom II X4 955, Phenom II X4 960T, Phenom II X6 1075T, and Intel Pentium G2120, Core i3-3220, Core i5-3330 Processors

Comparing old, cheap solutions from AMD with new, budget offerings from Intel.
February 1, 2013 · Processor Roundups

Inno3D GeForce GTX 670 iChill, Inno3D GeForce GTX 660 Ti Graphics Cards

A couple of mid-range adapters with original cooling systems.
January 30, 2013 · Video cards: NVIDIA GPUs

Creative Sound Blaster X-Fi Surround 5.1

An external X-Fi solution in tests.
September 9, 2008 · Sound Cards

AMD FX-8350 Processor

The first worthwhile Piledriver CPU.
September 11, 2012 · Processors: AMD

Consumed Power, Energy Consumption: Ivy Bridge vs. Sandy Bridge

Trying out the new method.
September 18, 2012 · Processors: Intel
  Latest Reviews More    RSS  

i3DSpeed, September 2013

Retested all graphics cards with the new drivers.
Oct 18, 2013 · 3Digests

i3DSpeed, August 2013

Added new benchmarks: BioShock Infinite and Metro: Last Light.
Sep 06, 2013 · 3Digests

i3DSpeed, July 2013

Added the test results of NVIDIA GeForce GTX 760 and AMD Radeon HD 7730.
Aug 05, 2013 · 3Digests

Gainward GeForce GTX 650 Ti BOOST 2GB Golden Sample Graphics Card

An excellent hybrid of GeForce GTX 650 Ti and GeForce GTX 660.
Jun 24, 2013 · Video cards: NVIDIA GPUs

i3DSpeed, May 2013

Added the test results of NVIDIA GeForce GTX 770/780.
Jun 03, 2013 · 3Digests
  Latest News More    RSS  

Platform  ·  Video  ·  Multimedia  ·  Mobile  ·  Other  ||  About us & Privacy policy  ·  Twitter  ·  Facebook


25

Copyright © Byrds Research & Publishing, Ltd., 1997–2011. All rights reserved.