ok, thanks. I wasn’t aware of this. Should this command fix everything
or is do i need to delete cephfs and pools and start again:
> ceph osd tier cache-mode CachePool writeback
On 29/05/15 11:37, John Spray wrote:
On 29/05/2015 11:34, Peter Tiernan wrote:
ok, thats interesting. I had issues before this crash where files
were being garbled. I followed what I thought was the correct
procedure for erasure coded pool with cache tier:
> ceph osd pool create ECpool 800 800 erasure default
> ceph osd pool create CachePool 4096 4096
> ceph osd tier add ECpool CachePool
> ceph osd tier cache-mode CachePool readonly
> ceph osd tier set-overlay ECpool CachePool
> ceph osd pool create cephfs_metadata 4096 4096
> ceph fs new cephfs cephfs_metadata ECpool
Is my mistake the last command above? should the ceph fs new be given
the CachePool and not the ECpool?
The problem is that you're creating a readonly cache tier instead of a
writeback cache tier. CephFS needs a writeback cache tier for
modifications and truncations.
Cheers,
John
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