[CentOS] raid resync speed? - laptop drive-

[Les Mikesell]

On 5/21/2010 4:19 PM, John R Pierce wrote:
> Les Mikesell wrote:
>> But it is just a match for the Seagate drives with the default layout
>> using one partition that fills the disk.  If I have to skip some amount
>> at the start of the partition I think that will make the partition size
>> not match, making it impossible to add as a raid member.
>>
>
> 750GB drives can vary quite a bit in size +/- depending on the exact
> model.   The required trim is 0-3.5K, and its due to the MBR on the
> first "track" of the drive before the first/primary partition starts.

The 3.5" Seagates look like:
Disk /dev/sdc: 750.1 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot   Start     End      Blocks   Id  System
/dev/sdc1     1       91201   732572001   fd  Linux raid autodetect

And the 2.5 WD looks the same to me:

Disk /dev/sdh: 750.1 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot  Start         End      Blocks   Id  System
/dev/sdh1      1       91201   732572001   fd  Linux raid autodetect

These is a backuppc archive with millions of hardlinks that will take 
forever to copy if I have to do a file-oriented copy onto a different 
partition size.

-- 
   Les Mikesell
    lesmikesell at gmail.com