On 9/16/19 11:36 AM, Eikermann, Robert 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/. > > > Can you explain why? The cache tiering has some serious flaws and can even decrease performance instead of improve it.
What are you trying to solve? Wido > 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 > > > > > _______________________________________________ > ceph-users mailing list -- ceph-users@ceph.io > To unsubscribe send an email to ceph-users-le...@ceph.io
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