Table 57. Statistics collection for individual nodes (continued)
idx Indicates the identifier of the MDisk for which the statistics apply.
rb Indicates the cumulative number of blocks of data that is read (since the
node has been running).
re Indicates the cumulative read external response time in milliseconds for each
MDisk. The cumulative response time for disk reads is calculated by starting
a timer when a SCSI read command is issued and stopped when the
command completes successfully. The elapsed time is added to the
cumulative counter.
ro Indicates the cumulative number of MDisk read operations that are processed
(since the node has been running).
rq Indicates the cumulative read queued response time in milliseconds for each
MDisk. This response is measured from above the queue of commands to be
sent to an MDisk because the queue depth is already full. This calculation
includes the elapsed time that is taken for read commands to complete from
the time they join the queue.
wb Indicates the cumulative number of blocks of data written (since the node
has been running).
we Indicates the cumulative write external response time in milliseconds for each
MDisk. The cumulative response time for disk writes is calculated by starting
a timer when a SCSI write command is issued and stopped when the
command completes successfully. The elapsed time is added to the
cumulative counter.
wo Indicates the cumulative number of MDisk write operations processed (since
the node has been running).
wq Indicates the cumulative write queued response time in milliseconds for each
MDisk. This is measured from above the queue of commands to be sent to an
MDisk because the queue depth is already full. This calculation includes the
elapsed time taken for write commands to complete from the time they join
the queue.
Table 58 describes the VDisk (volume) information that is reported for individual
nodes.
Note: MDisk statistics files for nodes are written to the /dumps/iostats directory
on the individual node.
Table 58. Statistic collection for volumes for individual nodes
Statistic
name
Description
id Indicates the volume name for which the statistics apply.
idx Indicates the volume for which the statistics apply.
rb Indicates the cumulative number of blocks of data read (since the node has
been running).
rl Indicates the cumulative read response time in milliseconds for each volume.
The cumulative response time for volume reads is calculated by starting a
timer when a SCSI read command is received and stopped when the
command completes successfully. The elapsed time is added to the
cumulative counter.
rlw Indicates the worst read response time in microseconds for each volume since
the last time statistics were collected. This value is reset to zero after each
statistics collection sample.
216 Storwize V7000 Unified: Problem Determination Guide 2073-720
To Next Page
Loading...
Need help?
General
