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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