On Thursday, April 21, 2016, Benoît LORIOT <benoit.lor...@aevoo.fr> wrote:
> Hello, > > we want to disable readproxy cache tier but before doing so we would like > to make sure we won't loose data. > > Is there a way to confirm that flush actually write objects to disk ? > > We're using ceph version 0.94.6. > > > I tried that, with cephfs_data_ro_cache being the hot storage pool and > cephfs_data being the cold storage pool > > # rados -p cephfs_data_ro_cache ls > > then choose a random object in the list : 100004d6142.00000000 > > Find the object on cache disk : > > # ceph osd map cephfs_data_ro_cache 100004d6142.00000000 > osdmap e301 pool 'cephfs_data_ro_cache' (6) object '100004d6142.00000000' > -> pg 6.d010000 (6.0) -> up ([4,5,8], p4) acting ([4,5,8], p4) > > Object is in the pg 6.0 on OSD 4, 5 and 8, I can find the file on disk. > > # ls -l > /var/lib/ceph/osd/ceph-4/current/6.0_head/DIR_0/DIR_0/DIR_0/DIR_0/100004d6142.00000000__head_0D010000__6 > -rw-r--r--. 1 root root 0 Apr 8 19:36 > /var/lib/ceph/osd/ceph-4/current/6.0_head/DIR_0/DIR_0/DIR_0/DIR_0/100004d6142.00000000__head_0D010000__6 > > Flush the object : > > # rados -p cephfs_data_ro_cache cache-try-flush 100004d6142.00000000 > > Find the object on disk : > > # ceph osd map cephfs_data 100004d6142.00000000 > osdmap e301 pool 'cephfs_data' (1) object '100004d6142.00000000' -> pg > 1.d010000 (1.0) -> up ([1,7,2], p1) acting ([1,7,2], p1) > > Object is in the pg 1.0 on OSD 1, 7 and 2, I can't find the file on disk > on any of the 3 OSDs > > # ls -l > /var/lib/ceph/osd/ceph-1/current/1.0_head/DIR_0/DIR_0/DIR_0/DIR_0/100004d6142.* > ls: cannot access > /var/lib/ceph/osd/ceph-1/current/1.0_head/DIR_0/DIR_0/DIR_0/DIR_0/100004d6142.*: > No such file or directory > > > > What am I doing wrong ? To me it seems that nothing is actually flushed to > disk. > > Is the directory actually hashed four levels deep? Or is it shallower and you're looking too far down? -Greg > Thank you, > Ben. >
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