Have you checked that the user/keys that your VMs are connecting to have access rights to the cache pool?
---- On Mon, 16 Sep 2019 17:36:38 +0800 Eikermann, Robert <eikermann@xxxxxxxxxx> wrote ----
Hi,
I’m using Ceph in combination with Openstack. For the “VMs” Pool I’d like to enable writeback caching tier, like described here: https://docs.ceph.com/docs/luminous/rados/operations/cache-tiering/ .
Should it be possible to do that on a running pool? I tried to do so and immediately all VMs (Linux Ubuntu OS) running on Ceph disks got readonly filesystems. No errors were shown in ceph (but also no traffic arrived after enabling the cache tier). Removing the cache tier , rebooting the VMs and doing a filesystemcheck repaired everything.
Best
Robert
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