xapi-project/xen-api — pull request #1955 by siddharthv (2014-09-22 05:45:54+00:00)
Title: CA-145355: Make xcp-rrdd reports all stats exposed by tapdisk3

Prior to XS6.5, a VM's metrics were supplied by xcp-rrdd,
xcp-rrd-iostat, etc... Originally, these metrics were created by reading
counters from `sysfs`. With tapdisk3, we read the statistics exposed
under '/dev/shm' to create these datasources.
The newly exposed counters are:
* vbd__iowait
* vbd__inflight
* vbd__iops_read
* vbd__iops_write
* vbd__iops_total
* vbd__io_throughput_total

Metrics like vbd__io_throughput_read and vbd__io_throughput_write
are redundant.

Signed-off-by: Siddharth Vinothkumar