Re: Luminous - bad performance

David Turner <drakonstein@xxxxxxxxx> · Mon, 22 Jan 2018 16:24:50 +0000

Disk models, other hardware information including CPU, network config?  You say you're using Luminous, but then say journal on same device.  I'm assuming you mean that you just have the bluestore OSD configured without a separate WAL or DB partition?  Any more specifics you can give will be helpful.

On Mon, Jan 22, 2018 at 11:20 AM Steven Vacaroaia <stef97@xxxxxxxxx> wrote:
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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