[linux-lvm] Performance problem.

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>> dd_rescue /dev/hda /dev/null

> Summary for /dev/hda -> /dev/null:rrxfer:         0.0k, succxfer: 230912.0k
> dd_rescue: (info): ipos:    231168.0k, opos:    231168.0k, xferd: 231168.0k
>                    errs:      0, errxfer:         0.0k, succxfer: 231168.0k
>              +curr.rate:    26353kB/s, avg.rate:    25406kB/s, avg.load: 22.1%


  Then you know the read speed with your drives are not a problem. You
  could  try  the  same with /dev/vg/lv instead of your hda and see if
  LVM is slowing down much.