Seagate Barracuda 7200.11 640 GByte

Published by Marc Büchel on 06.10.08
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How do we test?

Testenvironment

We recommend that readers who aren't interested in test procedures jump over this and the following page and head directly to the test results.

Test results


ModelSeagate Barracuda 720011 ST3640323AS640 GByte
MotherboardGigabyte X38-DQ6 
ChipsetIntel X381066 MHz
CPUIntel Xeon 30602.4 GHz
MemoryCorsair Dominator 9136 DDR22 GByte
Graphics cardGigabyte GeForce 7200 
Storage (system)Maxtor160 GByte
Operating systemsUbuntu 8.04.1 Hardy
Microsoft Windows XP
Kernel 2.6.24-19-server
SP3
FilesystemXFS 

We think everybody reading this article can imagine the following scenario: You just bought a hard drive which according the specs sheet should transfer 120 MByte/s reading and writing. In the reviews you read about astonishing 110 MByte/s but after you put the drive into you system it feels much slower. The whole story gets even worse when you start a benchmark which does randomread/write of 4 KByte blocks. There you only get two to three MBytes/s.

Because of this we don't want to publish screenshots of standard programs like HD-Tach, HD-Tune, ... we want our tests to be

  • reproducible,
  • accurate
  • meaningful and
  • varied

We test with activated caches and NCQ (Native Command Queueing) because they're also activated under daily use. But the data size tested is always at least twice the amount of the memory.

We noticed that the measuring error is constantly within ±2%. Therefore we mention it only here.

Additionally we evaluate the S.M.A.R.T. data to assess if there are already errors.

The following table give you a brief overview to which points we turn our centre of attention.

TestObservations
  
Sequential Read/Write Tests
  • Are the values within the specifications?
  • Which influence has the block size?
  • Which influence has the filesystems block size?
Random Read/Write Tests
  • How severe is the influence on the theoretically possible (sequential) datarate?
  • Which influence has the block size?
  • Which influence has the block size on the filesystem?
Database tests
  • How many transactions per second can the database deliver?
  • Does the speed stay constant if there are a lot of request simultaneously?
  • What is the CPU load?


Linux, XFS, why?

There are different reasons why we take a operating system based on a Linux Kernel instead of a fresh Windows Vista/XP installation with all Service Packs.

  • The filesystem XFS offers you a flexibility you can't get from NTFS.
  • The testprogram iozone runs natively under linux.
  • The test partly aims to server applications.
  • Iozone gives you data on a statistical basis (error, deviation, etc.)

The filesystem is going to be built as follows:

mkfs.xfs -f /dev/sdb
We mounted with the following options:
mount -o rw,noatime,logbufs=8 /dev/sdb /mnt/sea

Why do we test different block sizes?

It is important to reproduce scenarios of daily usage. Certain parameters need to be variable during the test to make a statement about the product. In our test the parameters are the different block sizes. It defines the size in KBytes which is written/read on the drive during a transaction.

With this method one can test the reading and writing of either small and big files. In a normal personal computer environment you usually don't find many files smaller than 16 KByte. The relative amount of small files is much bigger on a mail or database server. Therefore tests with small block sizes are of interest for database-based applications.

In bigger RAID arrays the hard disk cache is usually disabled and the RAID-Controller takes over the job of caching. Exactly in such setups hard drives need to be very fast when reading or writing small amounts of data. Sequential throughput isn't interesting in this case.




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Seagate Barracuda 7200.11 640 GByte - Storage - Reviews - ocaholic