On Tue, 1 Mar 2005, Nicola Fankhauser wrote:

the array (reading the first 8GiB from /dev/md0 with dd, bs=1024K) performs at about 174MiB/s, accessing the array through LVM2 (still with bs=1024K) only 86MiB/s.

Nicola,

which kernel are you using ?

2.4 vs 2.6 performance on my machine (and same problem on different machines)

raid5 13 disks

2.4:
write 100MB/s
read  140MB/s

2.6
write 100MB/s
read  280MB/s
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