Lustre 1.6 Operations Manual

Where:
Parameter
Cur. Count
Cur. Rate
#Events
Unit
last
min
avg
max
stddev
Description
Number of events of each type sent in the last interval (in this example,
10s)
Number of events per second in the last interval
Total number of such events since the system started
Unit of measurement for that statistic (microseconds, requests, buffers)
Average rate of these events (in units/event) for the last interval during
which they arrived. For instance, in the above mentioned case of
ost_destroy it took an average of 736 microseconds per destroy for the 400
object destroys in the previous 10 seconds.
Minimum rate (in units/events) since the service started
Average rate
Maximum rate
Standard deviation (not measured in all cases)
The events common to all services are:
Parameter
req_waittime
req_qdepth
req_active
reqbuf_avail
Description
Amount of time a request waited in the queue before being handled by an
available server thread.
Number of requests waiting to be handled in the queue for this service.
Number of requests currently being handled.
Number of unsolicited lnet request buffers for this service.
Some service-specific events of interest are:
Parameter
ldlm_enqueue
mds_reint
Description
Time it takes to enqueue a lock (this includes file open on the MDS)
Time it takes to process an MDS modification record (includes create,
mkdir, unlink, rename and setattr)
20-28 Lustre 1.6 Operations Manual • September 2008