6.6. OCS operator

Incorrect unit for the ceph_mds_mem_rss metric in the graph

When you search for the ceph_mds_mem_rss metrics in the OpenShift user interface (UI), the graphs show the y-axis in Megabytes (MB), as Ceph returns ceph_mds_mem_rss metric in Kilobytes (KB). This can cause confusion while comparing the results for the MDSCacheUsageHigh alert.

Workaround: Use ceph_mds_mem_rss * 1000 while searching this metric in the OpenShift UI to see the y-axis of the graph in GB. This makes it easier to compare the results shown in the MDSCacheUsageHigh alert.

(BZ#2261881)

Increasing MDS memory is erasing CPU values when pods are in CLBO state

When the metadata server (MDS) memory is increased while the MDS pods are in a crash loop back off (CLBO) state, CPU request or limit for the MDS pods is removed. As a result, the CPU request or the limit that is set for the MDS changes.

Workaround: Run the oc patch command to adjust the CPU limits.

For example:

$ oc patch -n openshift-storage storagecluster ocs-storagecluster \
    --type merge \
    --patch '{"spec": {"resources": {"mds": {"limits": {"cpu": "3"},
    "requests": {"cpu": "3"}}}}}'

(BZ#2265563)