Daniel P. Berrange wrote: [about requests vs sectors]
Yes, we need both. If we can't find actual request sizes for Xen, we should make a note and see if its possible add this to future Xen kernel backenddrivers.
I notice that in the version of Xen in Fedora 7, we now have the following statistics files, although for partition-backed paravirt domains only:
# ls /sys/devices/xen-backend/vbd-6-51712/statistics/ br_req oo_req rd_req rd_sect wr_req wr_sectrd_sect / wr_sect contain sectors, so if we can assume 512 bytes/sector then we could fill in the bytes fields.
The Xen block device stats collection code needs some work anyway in order to support hdX devices and fullvirt domains (where the statistics files are called tap_XX_req etc.)
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