Hi,
I'll appreciate if you can provide some guidance / suggestions regarding perfomance issues on a test cluster ( 3 x DELL R620, 1 Entreprise SSD, 3 x 600 GB ,Entreprise HDD, 8 cores, 64 GB RAM)
I created 2 pools ( replication factor 2) one with only SSD and the other with only HDD
( journal on same disk for both)
The perfomance is quite similar although I was expecting to be at least 5 times better
No issues noticed using atop
What should I check / tune ?
Many thanks
Steven
HDD based pool ( journal on the same disk)
ceph osd pool get scbench256 all
size: 2
min_size: 1
crash_replay_interval: 0
pg_num: 256
pgp_num: 256
crush_rule: replicated_rule
hashpspool: true
nodelete: false
nopgchange: false
nosizechange: false
write_fadvise_dontneed: false
noscrub: false
nodeep-scrub: false
use_gmt_hitset: 1
auid: 0
fast_read: 0
rbd bench --io-type write image1 --pool=scbench256
bench type write io_size 4096 io_threads 16 bytes 1073741824 pattern sequential
SEC OPS OPS/SEC BYTES/SEC
1 46816 46836.46 191842139.78
2 90658 45339.11 185709011.80
3 133671 44540.80 182439126.08
4 177341 44340.36 181618100.14
5 217300 43464.04 178028704.54
6 259595 42555.85 174308767.05
elapsed: 6 ops: 262144 ops/sec: 42694.50 bytes/sec: 174876688.23
fio /home/cephuser/write_256.fio
write-4M: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=rbd, iodepth=32
fio-2.2.8
Starting 1 process
rbd engine: RBD version: 1.12.0
Jobs: 1 (f=1): [r(1)] [100.0% done] [66284KB/0KB/0KB /s] [16.6K/0/0 iops] [eta 00m:00s]
fio /home/cephuser/write_256.fio
write-4M: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=rbd, iodepth=32
fio-2.2.8
Starting 1 process
rbd engine: RBD version: 1.12.0
Jobs: 1 (f=1): [W(1)] [100.0% done] [0KB/14464KB/0KB /s] [0/3616/0 iops] [eta 00m:00s]
SSD based pool
ceph osd pool get ssdpool all
size: 2
min_size: 1
crash_replay_interval: 0
pg_num: 128
pgp_num: 128
crush_rule: ssdpool
hashpspool: true
nodelete: false
nopgchange: false
nosizechange: false
write_fadvise_dontneed: false
noscrub: false
nodeep-scrub: false
use_gmt_hitset: 1
auid: 0
fast_read: 0
rbd -p ssdpool create --size 52100 image2
rbd bench --io-type write image2 --pool=ssdpool
bench type write io_size 4096 io_threads 16 bytes 1073741824 pattern sequential
SEC OPS OPS/SEC BYTES/SEC
1 42412 41867.57 171489557.93
2 78343 39180.86 160484805.88
3 118082 39076.48 160057256.16
4 155164 38683.98 158449572.38
5 192825 38307.59 156907885.84
6 230701 37716.95 154488608.16
elapsed: 7 ops: 262144 ops/sec: 36862.89 bytes/sec: 150990387.29
[root@osd01 ~]# fio /home/cephuser/write_256.fio
write-4M: (g=0): rw=write, bs=4K-4K/4K-4K/4K-4K, ioengine=rbd, iodepth=32
fio-2.2.8
Starting 1 process
rbd engine: RBD version: 1.12.0
Jobs: 1 (f=1): [W(1)] [100.0% done] [0KB/20224KB/0KB /s] [0/5056/0 iops] [eta 00m:00s]
fio /home/cephuser/write_256.fio
write-4M: (g=0): rw=randread, bs=4K-4K/4K-4K/4K-4K, ioengine=rbd, iodepth=32
fio-2.2.8
Starting 1 process
rbd engine: RBD version: 1.12.0
Jobs: 1 (f=1): [r(1)] [100.0% done] [76096KB/0KB/0KB /s] [19.3K/0/0 iops] [eta 00m:00s]
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