Hi all,
I have some problem after my scalar performance test !!
Setup:
Linux kernel: 3.2.0
OS: Ubuntu 12.04
Storage server : 11 HDD (each storage server has 11 osd, 7200 rpm, 1T) + 10GbE NIC + RAID card: LSI MegaRAID SAS 9260-4i
For every HDD: RAID0, Write Policy: Write Back with BBU, Read Policy: ReadAhead, IO Policy: Direct Storage server number : 1 to 4
Ceph version : 0.48.2
Replicas : 2
FIO cmd:
[Sequencial Read]
fio --iodepth = 32 --numjobs=1 --runtime=120 --bs = 65536 --rw = read --ioengine=libaio --group_reporting --direct=1 --eta=always --ramp_time=10 --thinktime=10
[Sequencial Read]
fio --iodepth = 32 --numjobs=1 --runtime=120 --bs = 65536 --rw = write --ioengine=libaio --group_reporting --direct=1 --eta=always --ramp_time=10 --thinktime=10
[Random Read]
fio --iodepth = 32 --numjobs=8 --runtime=120 --bs = 65536 --rw = randread --ioengine=libaio --group_reporting --direct=1 --eta=always --ramp_time=10 --thinktime=10
[Random Write]
fio --iodepth = 32 --numjobs=8 --runtime=120 --bs = 65536 --rw = randwrite --ioengine=libaio --group_reporting --direct=1 --eta=always --ramp_time=10 --thinktime=10
Use ceph client then create 1T RBD image for testing, the client also has 10GbE NIC , Linux kernel 3.2.0 , Ubuntu 12.04
Performance result:
Bandwidth (MB/sec)
┌────────────────────────────────────────
│storage server number│Sequential Read │Sequential Write│Random Read│Random Write │
├───────── ┼──────────────────────────────
│ 1 │ 259 │ 76 │ 837 │ 26 │
├───────── ┼──────────────────────────────
│ 2 │ 349 │ 121 │ 950 │ 45 │
├───────── ┼──────────────────────────────
│ 3 │ 354 │ 108 │ 490 │ 71 │
├───────── ┼──────────────────────────────
│ 4 │ 338 │ 103 │ 610 │ 89 │
├───────── ┼──────────────────────────────
We expect that bandwidth will increase when storage server increase under all case, but the result is not !!
Can you share your idea for read/write bandwidth when storage server increasing ?
In another case, we fixed use 4 storage servers then adjust the number of replicas 2 to 4
Performance result:
Bandwidth (MB/sec)
┌────────────────────────────────────────
│ replicas number │Sequential Read │Sequential Write│Random Read│Random Write │
├───────── ┼──────────────────────────────
│ 2 │ 338 │ 103 │ 614 │ 89 │
├───────── ┼──────────────────────────────
│ 3 │ 337 │ 76 │ 791 │ 62 │
├───────── ┼──────────────────────────────
│ 4 │ 337 │ 60 │ 754 │ 43 │
├───────── ┼──────────────────────────────
The bandwidth of write will decrease when replicas increase that is easy to know, but why read bandwidth did not increase?
Kelvin
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