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Compare disk performance
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Compare disk performance


I have a VPS with a provider here and disk speed was always about 100MB/s, but then it dropped to ~40MB/s. Here is an example:
dd if=/dev/zero of=sb-io-test bs=1M count=1k oflag=dsync 25.2214 s, 42.6 MB/s

I contacted the provider and they said that you can't test disk performance with dd:

Sorry, but 30 MB/s is not low by any stretch. In any case, testing iops will show a much better picture than raw disk write speed.

I did that and indeed it looks quite good:

ioping -c 10

request=1 time=0.0 ms

request=2 time=0.0 ms

request=3 time=0.0 ms

request=4 time=0.0 ms

request=5 time=0.0 ms

request=6 time=0.0 ms

request=7 time=0.0 ms

request=8 time=0.0 ms

request=9 time=0.1 ms

request=10 time=0.0 ms

10 requests completed in 9019.9 ms, 58824 iops, 229.8 mb/s

What do you think about that? How can I test the disk performance?


  • If I had 58824 iops on a VPS, I would be ecstatic.

  • Is that an SSD VPS?

  • oflag=dsync is just stupid

  • @dhamaniasad said:
    Is that an SSD VPS?

    No, it's a normal HDD.

    @rds100 said:
    oflag=dsync is just stupid

    Just copied the ServerBear benchmark but here is the LET standard one:
    [email protected]:~# dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync 16384+0 records in 16384+0 records out 1073741824 bytes (1.1 GB) copied, 18.8183 s, 57.1 MB/s

  • Can anybody help me? How can I check the disk performance? Which is more important, IOPS or dd?

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