Hello all,
I'm trying to add a new data pool to CephFS, as we need some longer
term archival storage.
ceph mds add_data_pool archive
Error EINVAL: can't use pool 'archive' as it's an erasure-code pool
Here are the steps taken to create the pools for this new datapool:
ceph osd pool create arccache 512 512 replicated replicated_ruleset
ceph osd pool set arccache min_size 2
ceph osd pool set arccache size 3
ceph osd erasure-code-profile set ec62profile k=6 m=2
ruleset-failure-domain=disktype ruleset-root=std
ceph osd pool create archive 2048 2048 erasure ec62profile ecpool
ceph osd tier add-cache archive arccache $((1024*1024*1024*1024*5))
ceph osd tier cache-mode arccache writeback
ceph osd tier set-overlay archive arccache
ceph osd pool set arccache cache_target_dirty_ratio 0.3
ceph osd pool set arccache target_max_objects 2000000
I'm running Ceph 0.94.2 on CentOS 7.1
The other thing that is probably *not* what we want is that I can add
the cache tier (arccache) as a datapool to CephFS. Doing so adds pool
id 35 (the cache tier) to the mdsmap, which is not what happens when
you create a new cephfs with a tiered EC pool as the datapool.
dumped mdsmap epoch 63386
epoch 63386
flags 0
created 2015-06-19 09:52:52.598619
modified 2015-07-21 16:21:12.672241
tableserver 0
root 0
session_timeout 60
session_autoclose 300
max_file_size 17592186044416
last_failure 63309
last_failure_osd_epoch 86152
compat compat={},rocompat={},incompat={1=base v0.20,2=client
writeable ranges,3=default file layouts on dirs,4=dir inode in
separate object,5=mds uses versioned encoding,6=dirfrag is stored in
omap,8=no anchor
table}
max_mds 1
in 0
up {0=142503496}
failed
stopped
data_pools 34,35
metadata_pool 32
inline_data disabled
141642223: 10.5.38.2:6800/78600 'hobbit02' mds.-1.0 up:standby seq 1
141732776: 10.5.38.14:6846/5875 'hobbit14' mds.-1.0 up:standby seq 1
156005649: 10.5.38.13:6892/20895 'hobbit13' mds.-1.0 up:standby seq 1
142503496: 10.5.38.1:6926/213073 'hobbit01' mds.0.2916 up:active seq 41344
Any thoughts? Is it a bug? Any work arounds?
--
Adam
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