I decided to refuse use of ssd cache pool and create just 2 pool. 1st pool only of ssd for fast storage 2nd only of hdd for slow storage.
What about this file, honestly, I don't know why it is created. As I say I flush the journal for fallen OSD and remove this file and then I start osd damon:
ceph-osd --flush-journal osd.3
rm -rf /var/lib/ceph/osd/ceph-4/current/3.2_head/rb.0.19f2e.238e1f29.000000000728__head_813E90A3__3
service ceph start osd.3
But if I turn the cache pool off the file isn't created:
ceph osd tier cache-mode ${cahec_pool} forward
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