Re: Changing pg_num on cache pool

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On 05/28/2017 09:43 PM, David Turner wrote:

What are your pg numbers for each pool? Your % used in each pool? And number of OSDs?

GLOBAL:

    SIZE       AVAIL      RAW USED     %RAW USED

    89380G     74755G       14625G         16.36

POOLS:

    NAME               ID     USED       %USED     MAX AVAIL     OBJECTS

    replicated_rbd     1       3305G     12.10        24007G      850006

    ec_rbd             2       2674G      5.83        43212G      686555

    ec_cache           3      82281M      0.33        24007G       20765


pool 1 'replicated_rbd' replicated size 3 min_size 2 crush_ruleset 1 object_hash rjenkins pg_num 256 pgp_num 256 last_change 218 flags hashpspool stripe_width 0

        removed_snaps [1~3,5~2,8~2,e~2]

pool 2 'ec_rbd' erasure size 5 min_size 4 crush_ruleset 0 object_hash rjenkins pg_num 256 pgp_num 256 last_change 188 lfor 107 flags hashpspool tiers 3 read_tier 3 write_tier 3 stripe_width 4128

        removed_snaps [1~5]

pool 3 'ec_cache' replicated size 3 min_size 2 crush_ruleset 1 object_hash rjenkins pg_num 16 pgp_num 16 last_change 1117 flags hashpspool,incomplete_clones tier_of 2 cache_mode writeback target_bytes 107400000000 target_objects 40000 hit_set bloom{false_positive_probability: 0.05, target_size: 0, seed: 0} 0s x1 decay_rate 0 search_last_n 0 stripe_width 0

        removed_snaps [1~5]


ec_cache settings:
ceph osd pool set ec_cache target_max_bytes 107400000000 # 100Gb
ceph osd pool set ec_cache cache_target_dirty_ratio 0.3
ceph osd pool set ec_cache cache_target_dirty_high_ratio 0.6
ceph osd pool set ec_cache cache_target_full_ratio 0.8
ceph osd pool set ec_cache target_max_objects 40000

Number of OSD is: 6x osd nodes * 4 osd = 24 OSDs.
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