[linux-lvm] why is pvmove so slow ?

[Markus Baertschi <markus markus org>]

I'm reorganizing my disks and use pvmove to move data. The operation is
much slower than waht I expected. My pvmove between two SATA disks is
moving along at around 10MB/s. The disks are capable of 80MB/s when
reading/writing with 'dd'.

I'm used to lvm stuff on AIX and there the pvmove equivalent is as fast as
the underlying hardware and I expected the same on my linux box.

How can I improve the performance ?

Markus
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