howdy! is it possible to achieve a higher average seek performance on a LVM2 LV with 4 PVs on 4 different disks compared to the seek performance of a single physical disk? If the random reads are equally distributed between the PVs then the LV seek performance should be 4 times as high. The number of bytes read is smaller than the stripe size. On both a striped and a linear configuration, the seek performance on the LV device is the same as the seek performance of the physical disks (all of identical model). It looks as if not more than one read can be in progress at the same time. is this true? seeks not on the LV device file but a file in the filesystem on the LV's are 20% faster and also a little bit faster than the physical device access time. In both cases, the device/file is opened with O_DIRECT. _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
