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Whats a reasonable expectation for SSD performance?

thorer01thorer01 Member
in General

I have been making the rounds and sampling dedicated servers from a number of providers. When I get a new server, i always benchmark with dd and other scripts like bench.sh and nench to get an idea of the baseline performance for sequential reads and writes.

Here's my question:

What is considered reasonable? 250 MB\s?

If the benchmarks are around 250 MB\s i just assume that it must be an older drive, or maybe only on a SATA II connection and mark it down as the best it can do. whats the threshold that you open a ticket for investigation?

I personally believe an SSD on a SATA III port should be in the neighborhood of 400 MB\s. Is that just an unreasonable outlook?

Comments

  • IshaqIshaq Member

    Depends on the brand of the drive and the technology used, whether it's single disk or RAID array, and other factors.

  • thorer01thorer01 Member

    Assume no raid, just a single drive.

  • eva2000eva2000 Veteran

    Sequential read/write performance isn't everything when looking at an SSD. Response time latency matters and difference can be huge for consumer vs enterprise SSDs i.e. fsync latency for databases https://www.percona.com/blog/2018/07/18/why-consumer-ssd-reviews-are-useless-for-database-performance-use-case/

    I updated my sysbench.sh script with file fsync benchmarks https://github.com/centminmod/centminmod-sysbench#sysbench-fileio-fsync

    Example for 2x Samsung PM863 Enterprise SSDs in raid 1 sysbench file fsync latency response time performance on a OVH Core i7 4790K dedicated using my sysbench.sh script which outputs markdown and csv formatted results too.

    fsync latency response time results are min: 0.04 ms, avg: 0.06 ms, max: 6.84 ms and 99th: 0.15 ms compared to some consumer/desktop SSDs I have seen average up to 7+ ms = 116x times slower!

    ./sysbench.sh file-fsync            

sysbench fileio fsync prepare
sysbench fileio --time=30 --file-num=1 --file-extra-flags= --file-total-size=4096 --file-block-size=4096 --file-fsync-all=on --file-test-mode=rndwr --file-fsync-freq=0 --file-fsync-end=0 --threads=1 --percentile=99 prepare

sysbench fileio --threads=1 --time=30 --file-num=1 --file-extra-flags= --file-total-size=4096 --file-block-size=4096 --file-fsync-all=on --file-test-mode=rndwr --file-fsync-freq=0 --file-fsync-end=0 --percentile=99 run
raw log saved: /home/sysbench/sysbench-fileio-fsync-threads-1-raw.log

sysbench 1.0.15 (using bundled LuaJIT 2.1.0-beta2)
threads: 1
Block-size 4KiB
Read/Write ratio for combined random IO test: 1.50
Using synchronous I/O mode
Doing random write test
reads/s: 0.00
writes/s: 16376.35
fsyncs/s: 16376.35
read-MiB/s: 0.00
written-MiB/s: 63.97
time: 30.0000s
min: 0.04
avg: 0.06
max: 6.84
99th: 0.15

| fileio sysbench | sysbench | threads: | Block-size | synchronous | random | reads/s: | writes/s: | fsyncs/s: | read-MiB/s: | written-MiB/s: | time: | min: | avg: | max: | 99th: |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| fileio | 1.0.15 | 1 | 4KiB | I/O | write | 0.00 | 16376.35 | 16376.35 | 0.00 | 63.97 | 30.0000s | 0.04 | 0.06 | 6.84 | 0.15 |

sysbench,sysbench,threads,Block-size,synchronous,random,reads/s,writes/s,fsyncs/s,read-MiB/s,written-MiB/s,time,min,avg,max,99th 
fileio,1.0.15,1,4KiB,I/O,write,0.00,16376.35,16376.35,0.00,63.97,30.0000s,0.04,0.06,6.84,0.15
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