Mailinglist Archive: opensuse (2459 mails)

[Per Jessen <per@xxxxxxxxxxxx>]

Otto Rodusek (AP-SGP) wrote:

> Is there an optimum 'bs' parameter to the dd command. For example if
> you want to clone 2 drives (dd if=/dev/hda of=/dev/hdb bs=??) is there
> a better value to bs that will finish the process faster? Will a
> larger value like bs=8257536 or a value like bs=32256 be better? Is it
> better to have a value that is a multiple of sectors (ie 63 sectors @
> 512 bytes = 32256)? Thanks for any comments. Otto.

Generally speaking - bigger blocksize, better performance.  It will
depend on your drives though, so why not just try it out?  Just do some
plain copies of fixed sized files and measure wall clock time.


/Per Jessen, Zürich

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