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

[general_email at technicalbloke.com]

James Courtier-Dutton wrote:
> 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 has been superceded by the "Veloci Raptor" WD1500HLFS which is a similar 10,000rpm/SATA II/16Mb cache disk but with an improved seek time of 4.2ms over the ADFD's 4.6ms.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.
>
> James
>   


Isn't that only the case if you've made your partitions use the entire
available space of the disk? I was under the impression if you left a
few megs unpartitioned when originally building the system you wouldn't
have that problem.

Roger.
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