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Merge PR #27472 into master

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* refs/pull/27472/head:
	doc/rados/operations/devices: document device failure prediction

Reviewed-by: Rick Chen <rick.chen@prophetstor.com>
Reviewed-by: Brad Hubbard <bhubbard@redhat.com>
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Sage Weil 2019-04-24 08:37:49 -05:00
commit 61d6d051de
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doc/rados/operations/devices.rst
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@ -75,7 +75,42 @@ for a specific timestamp) with::
Failure prediction
------------------
TBD
Ceph can predict life expectancy and device failures based on the
health metrics it collects. There are three modes:
* *none*: disable device failure prediction.
* *local*: use a pre-trained prediction model from the ceph-mgr daemon
* *cloud*: share device health and performance metrics an external
cloud service run by ProphetStor, using either their free service or
a paid service with more accurate predictions
The prediction mode can be configured with::
ceph config set global device_failure_prediction_mode <mode>
Prediction normally runs in the background on a periodic basis, so it
may take some time before life expectancy values are populated. You
can see the life expectancy of all devices in output from::
ceph device ls
You can also query the metadata for a specific device with::
ceph device info <devid>
You can explicitly force prediction of a device's life expectancy with::
ceph device predict-life-expectancy <devid>
If you are not using Ceph's internal device failure prediction but
have some external source of information about device failures, you
can inform Ceph of a device's life expectancy with::
ceph device set-life-expectancy <devid> <from> [<to>]
Life expectancies are expressed as a time interval so that
uncertainty can be expressed in the form of a wide interval. The
interval end can also be left unspecified.
Health alerts
-------------