Hi, Is there a built in setting in ceph that would set the cache pool from writeback to forward state automatically in case of an OSD fail from the pool?
Let;s say the size of the cache pool is 2. If an OSD fails ceph blocks write to the pool, making the VM that use this pool to be unaccesable. But an earlier copy of the data is present on the cold storage pool prior to the last cache flush. In this case, is it possible that when an OSD fails, the data on the cache pool to be flushed onto the cold storage pool and set the forward flag automatically on the cache pool? So that the VM can resume write to the block device as soon as the cache is flushed from the pool and read/write directly from the cold storage pool untill manual intervention on the cache pool is done to fix it and set it back to writeback? This way we can get away with a pool size of 2 without worrying for too much downtime! Hope i was explicit enough!
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