dd cloning slightly different disks

Christoph Kukulies kuku at kukulies.org
Wed Mar 31 19:51:47 UTC 2010

This are the bonnie results:

# bonnie -s 4000
File './Bonnie.1283', size: 4194304000
Writing with putc()...done
Writing intelligently...done
Reading with getc()...done
Reading intelligently...done
Seeker 1...Seeker 2...Seeker 3...start 'em...done...done...done...
              -------Sequential Output-------- ---Sequential Input-- 
              -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- 
Machine    MB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU  
/sec %CPU
         4000 118158 79.4 119134 19.0 44154 10.4 61967 53.0 104888 10.5 
5344.4 12.4


Christoph Kukulies schrieb:
> Thanks, Peter and all others. Indeed, in contrary to the expected, I 
> went into my office this morning, swapped the
> HD against the SSD, and was able to boot both FreeBSD, Windows without 
> a hitch or any other tweaking.
> The dd over USB 2.0 to the SSD from the WD hard disk took 21261 s 
> (nearly 6 hours)
> I would possibly have had better results if I had both disks connected 
> to a SATA controller
> and did the dd there, but so what, I'm there happily.
> Thanks for sharing.
> -- 
> Christoph
> Will post bonnie results later.
> Peter Steele schrieb:
>> Theoretically, doing a straight dd copy of one disk to another and 
>> then swapping in that disk should work. I've done it, with no other 
>> tweaking needed. I've never done it with mixed OS instances on the 
>> same disk, or for that matter with a solid state drive. You'll lose 
>> the trailing 12GB of your disk, although you might be able to expand 
>> the last partition of whatever OS uses it to include this lost space....
>> -----Original Message-----
>> From: owner-freebsd-questions at freebsd.org 
>> [mailto:owner-freebsd-questions at freebsd.org] On Behalf Of Christoph 
>> Kukulies
>> Sent: Tuesday, March 30, 2010 8:48 AM
>> To: freebsd-questions at freebsd.org
>> Subject: dd cloning slightly different disks
>> Though not 100% FreeBSD centric, my question, I know that disk 
>> partitioning experts are around here.
>> My noteook HD is a WD 5000BEVT, (500GB). Today I bought a Kingston 
>> SDnowV+ Solid State drive, 512GB, with the intention to make my 
>> notebook a bit faster. It's an Intel Core 2 Duo,
>> 7400 CPU.
>> The WD disk shows as having 976773168 sectors (500108 MB), the SSD 
>> has 1000215216 sectors (512110 MB).
>> At the moment I'm copying (dd) from the WD internal disk to the SSD 
>> which I had put into an external SATA Icybox.
>> I'm hoping to be able to use my FreeBSD and Windows partitions 
>> afterwards somehow, possibly with some geometry tweaking or what. Due 
>> to the different disk geometry I'm expecting that the partition table 
>> entries will be wrong.
>> Any clues how I should proceed when the copy will be done in 7 hours 
>> or so? (20MB/s is the transfer rate I got from a short test that I 
>> did before starting the big copy).
>> -- 
>> Christoph

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