RBD QoS configuration is not honored on devices mapped through "rbd map"
Environment
- Red Hat Ceph Storage 4
- Red Hat Ceph Storage 3
Issue
- RBD QoS configuration is not honored on devices mapped through "rbd map"
- Following RBD QoS configurations not taking effect,
rbd config pool set <pool> rbd_qos_iops_limit
rbd config image set <pool>/<image> rbd_qos_iops_limit
Resolution
- Please verify if RBD is mounted by krbd or librbd. RBD QoS is only supported by librbd, rather than krbd.
- Examples of rbd usage through librbd client, OpenStack Nova and Cinder volumes from Ceph backend, KVM virtual machines configured using rbd as disks through virsh configurations.
- Examples of rbd usage through krbd client, devices mapped by "rbd map" command and appears as /dev/rbdx
Root Cause
- librbd supports limiting per image IO, controlled by the following settings
Content from docs.ceph.com is not included.https://docs.ceph.com/en/latest/rbd/rbd-config-ref/#qos-settings
SBR
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