Re: [Dump-users] performane questions

[Tony N. <ton...@ge...>]

At 1:37 PM -0400 6/28/07, Jeffrey Ross wrote:
>moving a partition from one disk to another, the partition is just shy of
>300 GB (291GB) I used the syntax of "dump -0f - /dev/sdb2 | restore -rf -"
>
>The system is copying from one SATA drive to another SATA drive (3.0GB/s

3.0Gb/s?

>transfer rate is enabled).  The OS is Fedora 7.
>
>after a half hour dump is giving me estimate times of 20+ hours with a
>transfer rate 3930kB/s
>
>Is this about right? or should I run the dump/restore commands with
>additional options for better throughput?

It seems reasonable to me.  The source drive is doing a lot of seeking, a
seek or two for each file, though the destination drive gets to write more
smoothly.

Have you tried dd'ing some data across, just for testing the speed of
copying?  If you feel no need to defragment the partition and the
destination is as lorge as the source, you could do the copy with dd and
adjust the volume size later as needed.

If dump is the problem, you might try cpio instead.  Or tar, if you're so
inclined.  I think they'll all be about the same speed, however.
-- 
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TonyN.:'                       <mailto:ton...@ge...>
      '                              <http://www.georgeanelson.com/>