[linux-lvm] LVM and *bad* performance (no striping)

[Urs Thuermann]

Rik van Riel <riel at conectiva.com.br> writes:

> Maybe dd is reading in 512 byte blocks on /dev/sda5 and
> 4096 bytes on /dev/vg0/test ?

I've checked it.  The man page says if no bs is given, dd defaults to
512 bytes on any device.  I've also checked it with dd|wc.

The performance numbers I've observed seem to dependant on caching.


urs