Hi, we have a cluster with 3 nodes . Each node has 4 HDD and 1 SSD
We would like to have a pool only on ssd and a pool only on hdd, using class feature.
here is the setup
# buckets
host ceph01s3 {
id -3 # do not change unnecessarily
id -4 class hdd # do not change unnecessarily
id -21 class ssd # do not change unnecessarily
# weight 34.561
alg straw2
hash 0 # rjenkins1
item osd.0 weight 10.914
item osd.5 weight 10.914
item osd.8 weight 10.914
item osd.9 weight 1.819
}
host ceph02s3 {
id -5 # do not change unnecessarily
id -6 class hdd # do not change unnecessarily
id -22 class ssd # do not change unnecessarily
# weight 34.561
alg straw2
hash 0 # rjenkins1
item osd.1 weight 10.914
item osd.3 weight 10.914
item osd.7 weight 10.914
item osd.10 weight 1.819
}
host ceph03s3 {
id -7 # do not change unnecessarily
id -8 class hdd # do not change unnecessarily
id -23 class ssd # do not change unnecessarily
# weight 34.561
alg straw2
hash 0 # rjenkins1
item osd.2 weight 10.914
item osd.4 weight 10.914
item osd.6 weight 10.914
item osd.11 weight 1.819
}
root default {
id -1 # do not change unnecessarily
id -2 class hdd # do not change unnecessarily
id -24 class ssd # do not change unnecessarily
# weight 103.683
alg straw2
hash 0 # rjenkins1
item ceph01s3 weight 34.561
item ceph02s3 weight 34.561
item ceph03s3 weight 34.561
}
# rules
rule replicated_rule {
id 0
type replicated
min_size 1
max_size 10
step take default class hdd
step chooseleaf firstn 0 type host
step emit
}
rule erasure-code {
id 1
type erasure
min_size 3
max_size 4
step take default class hdd
step set_chooseleaf_tries 5
step set_choose_tries 100
step chooseleaf indep 0 type host
step emit
}
rule erasure2_1 {
id 2
type erasure
min_size 3
max_size 3
step take default class hdd
step set_chooseleaf_tries 5
step set_choose_tries 100
step chooseleaf indep 0 type host
step emit
}
rule erasure-pool.meta {
id 3
type erasure
min_size 3
max_size 3
step take default class hdd
step set_chooseleaf_tries 5
step set_choose_tries 100
step chooseleaf indep 0 type host
step emit
}
rule erasure-pool.data {
id 4
type erasure
min_size 3
max_size 3
step take default class hdd
step set_chooseleaf_tries 5
step set_choose_tries 100
step chooseleaf indep 0 type host
step emit
}
rule replicated_rule_ssd {
id 5
type replicated
min_size 1
max_size 10
step take default class ssd
step chooseleaf firstn 0 type host
step emit
}
# end crush map
pool 1 'device_health_metrics' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 1 pgp_num 1 autoscale_mode on last_change 1669 flags hashpspool stripe_width 0 pg_num_max 32 pg_num_min 1 application mgr_devicehealth
pool 5 'Datapool' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 32 pgp_num 32 autoscale_mode on last_change 2749 lfor 0/0/321 flags hashpspool,selfmanaged_snaps stripe_width 0 application rbd
pool 7 'erasure-pool.data' erasure profile k2m1 size 3 min_size 2 crush_rule 4 object_hash rjenkins pg_num 128 pgp_num 126 pgp_num_target 128 autoscale_mode on last_change 2780 lfor 0/0/1676 flags hashpspool,ec_overwrites stripe_width 8192 application cephfs
pool 8 'erasure-pool.meta' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 32 pgp_num 32 autoscale_mode on last_change 344 flags hashpspool stripe_width 0 pg_autoscale_bias 4 pg_num_min 16 recovery_priority 5 application cephfs
pool 9 '.rgw.root' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 32 pgp_num 32 autoscale_mode on last_change 592 flags hashpspool stripe_width 0 application rgw
pool 10 'brescia-ovest.rgw.log' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 32 pgp_num 32 autoscale_mode on last_change 595 flags hashpspool stripe_width 0 application rgw
pool 11 'brescia-ovest.rgw.control' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 32 pgp_num 32 autoscale_mode on last_change 597 flags hashpspool stripe_width 0 application rgw
pool 12 'brescia-ovest.rgw.meta' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 8 pgp_num 8 autoscale_mode on last_change 719 lfor 0/719/717 flags hashpspool stripe_width 0 pg_autoscale_bias 4 pg_num_min 8 application rgw
pool 13 'brescia-ovest.rgw.buckets.index' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 8 pgp_num 8 autoscale_mode on last_change 845 lfor 0/845/843 flags hashpspool stripe_width 0 pg_autoscale_bias 4 pg_num_min 8 application rgw
pool 14 'brescia-ovest.rgw.buckets.data' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 32 pgp_num 32 autoscale_mode on last_change 739 flags hashpspool stripe_width 0 application rgw
pool 15 'brescia-ovest.rgw.buckets.non-ec' replicated size 3 min_size 2 crush_rule 0 object_hash rjenkins pg_num 32 pgp_num 32 autoscale_mode on last_change 849 flags hashpspool stripe_width 0 application rgw
pool 17 'ssd_pool' replicated size 3 min_size 2 crush_rule 5 object_hash rjenkins pg_num 32 pgp_num 32 autoscale_mode on last_change 2774 lfor 0/0/2653 flags hashpspool stripe_width 0 application rbd
rados bench -p ssd_pool 10 write --no-cleanup
Object prefix: benchmark_data_ceph01s3.itservicenet.net_268
sec Cur ops started finished avg MB/s cur MB/s last lat(s) avg lat(s)
0 0 0 0 0 0 - 0
1 16 32 16 63.9957 64 0.937457 0.917873
2 16 48 32 63.9936 64 0.882778 0.898646
3 16 64 48 63.9929 64 0.949337 0.903045
4 16 81 65 64.9925 68 0.515819 0.897401
5 16 97 81 64.7919 64 1.00908 0.918797
6 16 114 98 65.3248 68 0.99787 0.922301
7 16 130 114 65.1339 64 0.794492 0.903341
8 16 147 131 65.4909 68 0.770237 0.892833
9 16 173 157 69.7677 104 0.976005 0.878237
10 16 195 179 71.5891 88 0.755363 0.869603
That is very poor !
Why ?
Thanks
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