Hi,
On 06/28/2017 01:19 PM, Jake Grimmett wrote:
Dear All,
Sorry is this has been covered before, but is it possible to configure
cephfs to report free space based on what is available in the main
storage tier?
My "df" shows 76%, this gives a false sense of security, when the EC
tier is 93% full...
i.e. # df -h /ceph
Filesystem Size Used Avail Use% Mounted on
ceph-fuse 440T 333T 108T 76% /ceph
# ls -lhd /ceph
drwxr-xr-x 1 root root 254T Jun 27 17:03 /ceph
but "ceph df" shows that our EC pool is %92.46 full.
# ceph df
GLOBAL:
SIZE AVAIL RAW USED %RAW USED
439T 107T 332T 75.57
POOLS:
NAME ID USED %USED MAX AVAIL OBJECTS
rbd 0 0 0 450G 0
ecpool 1 255T 92.46 21334G 105148577
hotpool 2 818G 64.53 450G 236023
metapool 3 274M 0.06 450G 2583306
Since 'df' is not able to access ceph (it simply does not know about
ceph), it can only reports the information returned by ceph-fuse /
kernel ceph.
'df' also operates on filesystem level, and data pools are assigned on
directory level (with the default pool being assigned to the root
directory). A single sane value for free available space is thus not
meaningful, so the cephfs implementation just reports the overall values.
Regards,
Burkhard Linke
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