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doc/rados/operations/health-checks: Added Stretch Mode health warnings

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Added stretch mode health warnings in docs for:

1. INCORRECT_NUM_BUCKETS_STRETCH_MODE

2. UNEVEN_WEIGHTS_STRETCH_MODE

Signed-off-by: Kamoltat <ksirivad@redhat.com>
This commit is contained in:
Kamoltat 2022-10-04 20:00:22 +00:00
parent 2c25b29347
commit cfc415c0d9
1 changed files with 25 additions and 0 deletions
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doc/rados/operations/health-checks.rst
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@ -1406,6 +1406,31 @@ other performance issue with the OSDs.
The exact size of the snapshot trim queue is reported by the ``snaptrimq_len``
field of ``ceph pg ls -f json-detail``.
Stretch Mode
------------
INCORRECT_NUM_BUCKETS_STRETCH_MODE
__________________________________
Stretch mode currently only support 2 dividing buckets with OSDs, this warning suggests
that the number of dividing buckets is not equal to 2 after stretch mode is enabled.
You can expect unpredictable failures and MON assertions until the condition is fixed.
We encourage you to fix this by removing additional dividing buckets or bump the
number of dividing buckets to 2.
UNEVEN_WEIGHTS_STRETCH_MODE
___________________________
The 2 dividing buckets must have equal weights when stretch mode is enabled.
This warning suggests that the 2 dividing buckets have uneven weights after
stretch mode is enabled. This is not immediately fatal, however, you can expect
Ceph to be confused when trying to process transitions between dividing buckets.
We encourage you to fix this by making the weights even on both dividing buckets.
This can be done by making sure the combined weight of the OSDs on each dividing
bucket are the same.
Miscellaneous
-------------