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Ubiquityhosting's SSD RAID-10 VPS based cloud only have 44.3M/s I/O speed,Is that realy SSD vps?
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Ubiquityhosting's SSD RAID-10 VPS based cloud only have 44.3M/s I/O speed,Is that realy SSD vps?

danefydanefy Member
edited April 2014 in General

i bought a ubiquityhosting.com cloud vps for test,but i find the I/O speed is only 44.3M/s avg,ubiquityhosting's guy said the it's SSD-based RAID-10 based vps,is that real SSD disk vps only have 44.3M/s speed? since ramnode's SSD one could reach 500M/S.

Comments

  • Another I/O speed comparison thread.

    Other than the GVH category, I think we should have the IO-Racing category as well.

    Thanked by 2Maximum_VPS Gunter
  • @eLohkCalb I just wanna get Confirm if it's a SSD one.

  • danefydanefy Member
    edited April 2014

    dd if=/dev/zero of=test bs=1M count=2048 oflag=dsync

    2048+0 records in

    2048+0 records out

    2147483648 bytes (2.1 GB) copied, 48.4221 s, 44.3 MB/s

    It's only have 44.3MB I/O??

  • How about asking the host to fix it, before coming here?

  • @Makenai Yes,i asked,But ubiquityhosting's guy replay me that they don't guarantee the disk speed.

  • rm_rm_ IPv6 Advocate, Veteran
    edited April 2014

    @danefy You're testing it wrong, replace oflag=dsync with conv=fdatasync

  • danefydanefy Member
    edited April 2014

    @rm_
    dd if=/dev/zero of=test bs=1M count=2048 conv=fdatasync

    2048+0 records in

    2048+0 records out

    2147483648 bytes (2.1 GB) copied, 8.02768 s, 268 MB/s

    much better now

    here is the SSD 10 base from ramnode

    dd if=/dev/zero of=test bs=1M count=2048 conv=fdatasync

    2048+0 records in

    2048+0 records out

    2147483648 bytes (2.1 GB) copied, 1.63238 s, 1.3 GB/s

    Both SSD 10 base vps, why Ramnode one is 5 times faster than ubiquityhosting one?

  • @rm_ said:
    danefy You're testing it wrong, replace oflag=dsync with conv=fdatasync

    Mind telling the difference?

  • BradBrad Member

    @danefy said:
    rm_
    dd if=/dev/zero of=test bs=1M count=2048 conv=fdatasync

    2048+0 records in

    2048+0 records out

    2147483648 bytes (2.1 GB) copied, 8.02768 s, 268 MB/s

    much better now

    here is the SSD 10 base from ramnode

    dd if=/dev/zero of=test bs=1M count=2048 conv=fdatasync

    2048+0 records in

    2048+0 records out

    2147483648 bytes (2.1 GB) copied, 1.63238 s, 1.3 GB/s

    Both SSD 10 base vps, why Ramnode one is 5 times faster than ubiquityhosting one?

    These two hosts probably have different node setups.

  • rm_rm_ IPv6 Advocate, Veteran

    Makenai said: Mind telling the difference?

    https://romanrm.net/dd-benchmark

    Thanked by 2Spencer Makenai
  • danefy said: 2147483648 bytes (2.1 GB) copied, 8.02768 s, 268 MB/s

    OMG ONLY 268MB/s THAT'S TERRIBLE!!!!! TREATEN WITH CHARGEBACK AND WRITE A BAD REVIEW!!!!!!!

    Now seriously, there are many possible reasons for the differences.

    First one of the hosts might be using a RAID card with large RAM buffer which buffers the writes and to you it seems the writes are happening faster than the SSDs could handle.

    Then there are different types of SSDs. Some SSDs have a controller chip which compresses the data that is being written, so when you send it zeroes, the zeroes get compressed and much less data is really written, so the result is that the write seems much faster than the flash chips could really handle if it was all random data.

    And then... there could be other ways to artificially improve the DD write speed if a host really wanted to. But i hope nobody is doing this.

    Thanked by 1hostnoob
  • kyakykyaky Member
    edited April 2014

    The I/O is not even close to prometeus' SSD. I've never thought about ubiquityhosting at all. I know abusers prefer ubiquityhosting and psychz so I never touch them. why I know this? I'm a bloody Chinese.

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