[Gllug] OT: Replace old model WD Raptor with new within CentOS 4 RAID system?

James Courtier-Dutton james.dutton at gmail.com
Mon May 24 19:34:40 UTC 2010

On 24 May 2010 15:54, gvim <gvimrc at googlemail.com> wrote:
> A client has an old CentOS 4, 3-disk LSI MegaRAID system running on 3 x 150GB WD Raptor 10,000rpm disks. They're a few years old and one has now blown but the original model:
> WD1500ADFD
> ... has been superceded by the "Veloci Raptor" WD1500HLFS which is a similar 10,000rpm/SATA II/16Mb cache disk but with an improved seek time of 4.2ms over the ADFD's 4.6ms.
> The new model also has improved firmware so am I correct in assuming replacing the dead disk with the new model is a non-starter?
> gvim

Those two discs are similar enough from the performance perspective.
The thing to watch out for is the number of sectors available on the HD.
If the new HD has even one sector less than the previous one, it will
not work correctly.

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