Hi Greg, yes directory is hashed four levels deep and contain files
# ls -l /var/lib/ceph/osd/ceph-1/current/1.0_head/DIR_0/DIR_0/DIR_0/DIR_0/ total 908 -rw-r--r--. 1 root root 601 Mar 15 15:01 10000021bdf.00000000__head_E5BD0000__1 -rw-r--r--. 1 root root 178571 Mar 15 15:06 10000026de5.00000000__head_7E280000__1 -rw-r--r--. 1 root root 7853 Mar 15 15:16 10000030a58.00000000__head_0DA40000__1 -rw-r--r--. 1 root root 0 Mar 17 12:51 100000c1ccc.00000000__head_D0730000__1 -rw-r--r--. 1 root root 0 Mar 17 17:23 100000fc00c.00000000__head_83020000__1 -rw-r--r--. 1 root root 0 Mar 17 17:23 100000fcae7.00000000__head_C3A70000__1 [...] 2016-04-25 17:27 GMT+02:00 Gregory Farnum <gfar...@redhat.com>: > 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. >> > -- ________________________________________________________ Cordialement, *Benoit LORIOT* *Ligne directe: 07 85 22 44 57* ________________________________________________________
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