Hi, all:
I am doing some benchmark of rbd.
The platform is on a NAS storage.
CPU: Intel E5640 2.67GHz
Memory: 192 GB
Hard Disk: SATA 250G * 1, 7200 rpm (H0) + SATA 1T * 12 , 7200rpm
(H1~ H12)
RAID Card: LSI 9260-4i
OS: Ubuntu12.04 with Kernel 3.2.0-24
Network: 1 Gb/s
We create 12 OSD on H1 ~ H12 with the journal is put on H0.
We also create 3 MON in the cluster.
In briefly, we setup a ceph cluster all-in-one, with 3 monitors and
12 OSD.
The benchmark tool we used is fio 2.0.3. We had 7 basic test case
1) sequence write with bs=64k
2) sequence read with bs=64k
3) random write with bs=4k
4) random write with bs=16k
5) mix read/write with bs=4k
6) mix read/write with bs=8k
7) mix read/write with bs=16k
We create several rbd with different object size for the benchmark.
1. size = 20G, object size = 32KB
2. size = 20G, object size = 512KB
3. size = 20G, object size = 4MB
4. size = 20G, object size = 32MB
We have some conclusion after the benchmark.
a. We can get better performance of sequence read/write when the
object size is bigger.
Seq-read Seq-write
32 KB 23 MB/s 690 MB/s
512 KB 26 MB/s 960 MB/s
4 MB 27 MB/s 1290 MB/s
32 MB 36 MB/s 1435 MB/s
b. There is no obvious influence for random read/write when the
object size is different.
All the result are in a range not more than 10%.
rand-write-4K rand-write-16K mix-4K
mix-8k mix-16k
881 iops 564 iops
1462 iops 1127 iops 1044 iops
c. It we change the environment, for every 3 hard drive, we bind
them together by RAID0. (LSI 9260-4i RAID card)
So the ceph cluster becomes 3 MONs and 4 OSD (3T for each)
We can get better performance on all items, around 10% ~ 20%
enhancement.
d. If we change H0 to a SSD device, and we also put all journal
on it. We can get better performance on sequence-write.
It would reach 135MB/s. However, there are no different for other
test items.
We want to check with you, if all the conclusion are reasonable for
you? Or any seems strange? Thanks!
====
Here is some data if I use command provided by rados.
rados -p rbd bench 120 write -t 8
Total time run: 120.751713
Total writes made: 930
Write size: 4194304
Bandwidth (MB/sec): 30.807
Average Latency: 1.03807
Max latency: 2.63197
Min latency: 0.205726
[INF] bench: wrote 1024 MB in blocks of 4096 KB in 13.219819 sec
at 79318 KB/sec
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