Why is the disk performance very slow on my Lenovo ThinkStation S10 under Red Hat Enterprise Linux 5.1 or later?

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The ThinkStation S10 is often defaulted in the factory to disable AHCI support resulting is noticeably slow disk I/O performance.

Running Red Hat Enterprise Linux 5.1 or later on a ThinkStation S10, may result in slow performance if the disk controller is set to IDE mode. For the best performance, the disk controller should be set to AHCI mode. This setting can be adjusted in the BIOS a...

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