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f8f47852f3
Fixes: https://tracker.ceph.com/issues/66173 Signed-off-by: Jos Collin <jcollin@redhat.com>
133 lines
3.9 KiB
ReStructuredText
133 lines
3.9 KiB
ReStructuredText
.. _cephfs_metrics:
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Metrics
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=======
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CephFS uses :ref:`Perf Counters` to track metrics. The counters can be labeled (:ref:`Labeled Perf Counters`).
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Client Metrics
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--------------
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CephFS exports client metrics as :ref:`Labeled Perf Counters`, which could be used to monitor the client performance. CephFS exports the below client metrics.
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.. list-table:: Client Metrics
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:widths: 25 25 75
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:header-rows: 1
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* - Name
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- Type
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- Description
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* - num_clients
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- Gauge
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- Number of client sessions
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* - cap_hits
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- Gauge
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- Percentage of file capability hits over total number of caps
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* - cap_miss
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- Gauge
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- Percentage of file capability misses over total number of caps
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* - avg_read_latency
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- Gauge
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- Mean value of the read latencies
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* - avg_write_latency
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- Gauge
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- Mean value of the write latencies
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* - avg_metadata_latency
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- Gauge
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- Mean value of the metadata latencies
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* - dentry_lease_hits
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- Gauge
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- Percentage of dentry lease hits handed out over the total dentry lease requests
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* - dentry_lease_miss
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- Gauge
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- Percentage of dentry lease misses handed out over the total dentry lease requests
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* - opened_files
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- Gauge
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- Number of opened files
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* - opened_inodes
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- Gauge
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- Number of opened inodes
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* - pinned_icaps
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- Gauge
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- Number of pinned Inode Caps
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* - total_inodes
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- Gauge
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- Total number of Inodes
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* - total_read_ops
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- Gauge
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- Total number of read operations generated by all process
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* - total_read_size
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- Gauge
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- Number of bytes read in input/output operations generated by all process
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* - total_write_ops
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- Gauge
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- Total number of write operations generated by all process
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* - total_write_size
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- Gauge
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- Number of bytes written in input/output operations generated by all processes
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Getting Metrics
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===============
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The metrics could be scraped from the MDS admin socket as well as using the tell interface. The ``mds_client_metrics-<fsname>`` section in the output of ``counter dump`` command displays the metrics for each client as shown below::
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"mds_client_metrics": [
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{
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"labels": {
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"fs_name": "<fsname>",
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"id": "14213"
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},
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"counters": {
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"num_clients": 2
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}
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}
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],
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"mds_client_metrics-<fsname>": [
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{
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"labels": {
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"client": "client.0",
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"rank": "0"
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},
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"counters": {
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"cap_hits": 5149,
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"cap_miss": 1,
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"avg_read_latency": 0.000000000,
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"avg_write_latency": 0.000000000,
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"avg_metadata_latency": 0.000000000,
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"dentry_lease_hits": 0,
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"dentry_lease_miss": 0,
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"opened_files": 1,
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"opened_inodes": 2,
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"pinned_icaps": 2,
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"total_inodes": 2,
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"total_read_ops": 0,
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"total_read_size": 0,
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"total_write_ops": 4836,
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"total_write_size": 633864192
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}
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},
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{
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"labels": {
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"client": "client.1",
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"rank": "0"
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},
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"counters": {
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"cap_hits": 3375,
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"cap_miss": 8,
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"avg_read_latency": 0.000000000,
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"avg_write_latency": 0.000000000,
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"avg_metadata_latency": 0.000000000,
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"dentry_lease_hits": 0,
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"dentry_lease_miss": 0,
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"opened_files": 1,
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"opened_inodes": 2,
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"pinned_icaps": 2,
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"total_inodes": 2,
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"total_read_ops": 0,
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"total_read_size": 0,
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"total_write_ops": 3169,
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"total_write_size": 415367168
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}
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}
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]
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