Re: raid resync speed? - laptop drive-

[Robert Nichols <rnicholsNOSPAM@xxxxxxxxxxx>]

On 05/22/2010 11:29 AM, Les Mikesell wrote:
> Robert Nichols wrote:
>> On 05/21/2010 07:39 PM, Robert Nichols wrote:
>>> You have another way out.  By my calculation, that drive is partitioned
>>> in DOS compatibility mode, which leaves the remainder of the MBR track
>>> unused.  Running fdisk in expert mode ("x" command), you can move the
>>> partition's beginning of data ("b" command) from sector 63 back to
>>> sector 56.  That will give you the needed 4K alignment and a partition
>>> that is no smaller than what it was before.
>>
>> Right idea, not the right procedure.  You'll need to turn off DOS
>> compatibility mode, then create the partition, and then go into
>> expert mode and move the beginning of data from sector 1 to sector
>> 56.
>>
>
> It ended up like this, but still sync'ing at about 4M/sec instead of 40.
>
>
> Expert command (m for help): p
>
> Disk /dev/sdh: 255 heads, 63 sectors, 91201 cylinders
>
> Nr AF  Hd Sec  Cyl  Hd Sec  Cyl     Start      Size ID
>    1 00   0   2    0 254  63   64         56 1465144009 fd

Is that one of those WD drives that falsely reports its physical sector
size as 512 bytes?  I don't know if the kernel can always do the right
thing when that happens, but all the reports I've seen say that getting
the start of the partition aligned properly is sufficient.

What does "hdparm -I /dev/sdh | grep 'Sector size'" show?

-- 
Bob Nichols     "NOSPAM" is really part of my email address.
                 Do NOT delete it.

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