mirror of
https://github.com/ceph/ceph
synced 2024-12-23 20:03:56 +00:00
4f227e108d
Fixes: http://tracker.ceph.com/issues/21763 Signed-off-by: Jason Dillaman <dillaman@redhat.com>
86 lines
2.9 KiB
ReStructuredText
86 lines
2.9 KiB
ReStructuredText
-----------------------------
|
|
Monitoring the iSCSI gateways
|
|
-----------------------------
|
|
|
|
Ceph provides an additional tool for iSCSI gateway environments
|
|
to monitor performance of exported RADOS Block Device (RBD) images.
|
|
|
|
The ``gwtop`` tool is a ``top``-like tool that displays aggregated
|
|
performance metrics of RBD images that are exported to clients over
|
|
iSCSI. The metrics are sourced from a Performance Metrics Domain Agent
|
|
(PMDA). Information from the Linux-IO target (LIO) PMDA is used to list
|
|
each exported RBD image with the connected client and its associated I/O
|
|
metrics.
|
|
|
|
**Requirements:**
|
|
|
|
- A running Ceph iSCSI gateway
|
|
|
|
**Installing:**
|
|
|
|
#. As ``root``, install the ``ceph-iscsi-tools`` package on each iSCSI
|
|
gateway node:
|
|
|
|
::
|
|
|
|
# yum install ceph-iscsi-tools
|
|
|
|
#. As ``root``, install the performance co-pilot package on each iSCSI
|
|
gateway node:
|
|
|
|
::
|
|
|
|
# yum install pcp
|
|
|
|
#. As ``root``, install the LIO PMDA package on each iSCSI gateway node:
|
|
|
|
::
|
|
|
|
# yum install pcp-pmda-lio
|
|
|
|
#. As ``root``, enable and start the performance co-pilot service on
|
|
each iSCSI gateway node:
|
|
|
|
::
|
|
|
|
# systemctl enable pmcd
|
|
# systemctl start pmcd
|
|
|
|
#. As ``root``, register the ``pcp-pmda-lio`` agent:
|
|
|
|
::
|
|
|
|
cd /var/lib/pcp/pmdas/lio
|
|
./Install
|
|
|
|
By default, ``gwtop`` assumes the iSCSI gateway configuration object is
|
|
stored in a RADOS object called ``gateway.conf`` in the ``rbd`` pool.
|
|
This configuration defines the iSCSI gateways to contact for gathering
|
|
the performance statistics. This can be overridden by using either the
|
|
``-g`` or ``-c`` flags. See ``gwtop --help`` for more details.
|
|
|
|
The LIO configuration determines which type of performance statistics to
|
|
extract from performance co-pilot. When ``gwtop`` starts it looks at the
|
|
LIO configuration, and if it find user-space disks, then ``gwtop``
|
|
selects the LIO collector automatically.
|
|
|
|
**Example ``gwtop`` Outputs**
|
|
|
|
::
|
|
|
|
gwtop 2/2 Gateways CPU% MIN: 4 MAX: 5 Network Total In: 2M Out: 3M 10:20:00
|
|
Capacity: 8G Disks: 8 IOPS: 503 Clients: 1 Ceph: HEALTH_OK OSDs: 3
|
|
Pool.Image Src Size iops rMB/s wMB/s Client
|
|
iscsi.t1703 500M 0 0.00 0.00
|
|
iscsi.testme1 500M 0 0.00 0.00
|
|
iscsi.testme2 500M 0 0.00 0.00
|
|
iscsi.testme3 500M 0 0.00 0.00
|
|
iscsi.testme5 500M 0 0.00 0.00
|
|
rbd.myhost_1 T 4G 504 1.95 0.00 rh460p(CON)
|
|
rbd.test_2 1G 0 0.00 0.00
|
|
rbd.testme 500M 0 0.00 0.00
|
|
|
|
In the *Client* column, ``(CON)`` means the iSCSI initiator (client) is
|
|
currently logged into the iSCSI gateway. If ``-multi-`` is displayed,
|
|
then multiple clients are mapped to the single RBD image.
|