[Soekris] Harddisk Slow

Igor Sobrado igor at string1.ciencias.uniovi.es
Wed Jan 31 09:21:04 UTC 2007


In message <1816282B-B315-4DE7-B13F-EFE507FB9CD2 at ctrlsft.com>, Steven Finnegan writes:
> Heinrich:
> 
> When using DD, it is important that you set the buffer size.  
> Otherwise you end up transferring ONE sector at a time, which is very  
> inefficient.

bs is the block size, not the buffer size.  It is, however, an useless
parameter if the filesystem is not tuned to use that block size on all
transactions by means of newfs.  A block size of 1024KB is probably
not supported, and certainly not recommended for a general purpose
filesystem (a fragment size of 128KB is certainly a waste of space
for most filesystems, perhaps it will work for databases).  On a FFS,
the default block size is 16KB.

Cheers,
Igor.


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