[GLLUG] Odd SATA Issue - slightly OT

Alain D D Williams addw at phcomp.co.uk
Mon Dec 24 21:19:14 UTC 2018

On Mon, Dec 24, 2018 at 08:51:09PM +0000, Greater London Linux UUG wrote:
> Hi Everyone,
> I have an older centos 6 system that has 3 sata disks in soft raid5.
> I've noticed that the disk performance has become very poor.
> I did several "dd if=/dev/sdX of=/dev/null count=10000" tests on the
> disks and found one of them performing around 1 MB/s while the
> others are at 150 MB/s or more.

A cheat fix attempt is to replace the power supply. These tend to fade over time
and can cause disks to play up - however I would have expected to see errors in

Alain Williams
Linux/GNU Consultant - Mail systems, Web sites, Networking, Programmer, IT Lecturer.
+44 (0) 787 668 0256  https://www.phcomp.co.uk/
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