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dd - unequal speed from partition to partition, partition to file, file


From: bolega
Subject: dd - unequal speed from partition to partition, partition to file, file to partition
Date: Mon, 28 Mar 2011 12:28:03 -0700 (PDT)
User-agent: G2/1.0

dd - unequal speed from partition to partition, partition to file,
file to partition

/dev/sda1 to /dev/sda2            around 25Meg/s
/dev/sda1 to a file_sda1          around 12Meg/s
file_sda1 to /dev/sda1             around  5Meg/s

Why ???

I have played with various block sizes such 1M, 4M, 500M

In the all three cases, its from the same disk to itself   OR   from
different disks, eg SATA to USB ... if I recall correctly.

Please give an explanation why read from a file to disk partition is
so slow ???

Bolega









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