[CentOS] raid resync speed? - laptop drive-

[John R Pierce]

John Doe wrote:
> From: Robert Nichols <rnicholsNOSPAM at comcast.net>
>   
>> Is that one of those WD drives that falsely 
>> reports its physical sector size as 512 bytes?
>>     
>
> From the Scorpio blue specs, if I divide the capacity by the number of sectors, I get 512...
>   



all these new 'advanced' drives look to the host like they have 512 byte 
sectors.... its just that they pack 8 of them internally into a single 
4K sector.    if you don't ensure that your partitions start on a 4K (8 
sector) boundary, then committed random writes are very slow as your 
logical file system blocks will span multiple physical sectors