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Re: Is this a DD bug?

From: Pádraig Brady
Subject: Re: Is this a DD bug?
Date: Sat, 07 Nov 2009 23:56:23 +0000
User-agent: Thunderbird (X11/20071008)

address@hidden wrote:
> I have a strange dd problem when running the dd command on brand new hard 
> drives.
> If I DD to a hard drive that has been previously used, the DD takes about 35 
> minutes.
> If I clone to a completely brand new drive, the DD takes over 100 minutes.
> If I immediately run the DD command again, on the same set of drives, the DD 
> now only takes 35 minutes.

Very unlikely to be anything to do with dd.
Are these SSDs ? What block size are you using?
What size are the disks. What kernel version are you using.
Maybe `strace -e write -T dd ...` might point to something.


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