Re: Disk I/O error while rebuilding an md raid-5 array

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On Mon, 8 Feb 2010 22:24:09 -0600, Wil Reichert <wil.reichert@xxxxxxxxx>
wrote:
> On Mon, Feb 8, 2010 at 7:23 PM, Dawning Sky <the.dawning.sky@xxxxxxxxx>
> wrote:
>> On Mon, Feb 8, 2010 at 3:23 PM, Dawning Sky <the.dawning.sky@xxxxxxxxx>
>> wrote:
>>> It appears clonezilla is using dd and the speed is extremely
>>> slow (~5MB/sec) and it says it's gonna take 1 day to clone the 500GB.
>>
>> BTW, is it normal for dd to be this slow, or is there something wrong
>> with my setup?  These are quite modern drives and should be able to
>> handle sequential transfer of 10's of MB/s.  I have never used dd
>> before so I don't have any experience.
> 
> dd should be pretty close to the max possible throughput of yer drive.
>  For example, I dd'd a 1T WD black not too long ago & it was around
> 120MB/s on the outside & 70MB/s in the middle.

I think this depends more on the block size that is used. 1MB block sizes
are much faster than 512 byte blocks...

-- 
Steven Haigh
 
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