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Can someone explain I/O speed to me?

lukenstinelukenstine Member
in General

is this good or bad: I/O speed : 41.0 MB/s

Comments

  • blackblack Member

    41 is usable, but on the bad side. Usually I look for host with consistent DD speed at 100+ MB/sec.

  • lukenstinelukenstine Member

    @black said:
    41 is usable, but on the bad side. Usually I look for host with consistent DD speed at 100+ MB/sec.

    sometimes when i run the benchmark command. i get I/O Speed: 0MB is this normal?

  • blackblack Member

    0 MB? lol no that's not normal. How does your VPS even run anything if you have 0 MB/sec write speed?

  • xcubehostxcubehost Member

    Sounds like the VPS is horribly broken, or the tests/script isnt working properly ;)

  • PcJamesyPcJamesy Member

    Could you please share the benchmark command you are using?

  • darkshiredarkshire Member

    more importantly, can you share the host you are with ?

  • lukenstinelukenstine Member

    im using online.net

  • lukenstinelukenstine Member
    edited February 2014

    @PcJamesy said:
    Could you please share the benchmark command you are using?

    wget freevps.us/downloads/bench.sh -O - -o /dev/null|bash

  • NoermanNoerman Member
    edited February 2014

    @lukenstine Could you post your result?

    UPDATE:

    For comparison, here an INIZ KVM VPS

    wget freevps.us/downloads/bench.sh -O - -o /dev/null|bash

    CPU model :  QEMU Virtual CPU version (cpu64-rhel6)
Number of cores : 2
CPU frequency :  2099.998 MHz
Total amount of ram : 502 MB
Total amount of swap : 0 MB
System uptime :   1:06,
Download speed from CacheFly: 80.4MB/s
Download speed from Coloat, Atlanta GA: 3.61MB/s
Download speed from Softlayer, Dallas, TX: 3.11MB/s
Download speed from Linode, Tokyo, JP: 1.34MB/s
Download speed from i3d.net, Rotterdam, NL: 2.16MB/s
Download speed from Leaseweb, Haarlem, NL: 1.65MB/s
Download speed from Softlayer, Singapore: 997KB/s
Download speed from Softlayer, Seattle, WA: 2.82MB/s
Download speed from Softlayer, San Jose, CA: 3.11MB/s
Download speed from Softlayer, Washington, DC: 29.9MB/s
I/O speed :  588 MB/s

    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, 1.70605 s, 629 MB/s
  • VpscrazeVpscraze Member

    Try running the following command and post your I/O:

    dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync

  • PcJamesyPcJamesy Member

    Because no one answered the question in the topic, IO simply put is the speed of the drive on your server. And if your getting 0 MB/s that's really bad.

  • ahmiqahmiq Member

    I/o is the disks read and write operation speed. Anything above 50 MB/s should be okay for normal operation. Low I/O On dedicated means problem with disk io npt using something disk intensive. On vps it either could be bad disk but most of the time someone is abusing I/o or server highly oversold

  • tchentchen Member

    You're on a dedi with (my guess) a single sata. Doing dd's when it's busy doing other things is going to get you abysmal numbers - sometimes even zero. 40 is a bit low but not unexpected on older standard commodity hardware.

  • LeeLee Veteran
    edited February 2014

    Does online.net do VPS? I thought it was only Dedicated. If the OP is on a dedicated confused with IO it may be a setup issue or failing drive more than online.net, just saying..

  • lukenstinelukenstine Member

    @Noerman said:
    lukenstine Could you post your result?

    keep in mind this is the dedicated server for 9.99 euros a month

    wget freevps.us/downloads/bench.sh -O - -o /dev/null|bash

    CPU model : VIA Nano processor U2250 (1.6GHz Capable)
    Number of cores : 1
    CPU frequency : 1595.910 MHz
    Total amount of ram : 1974 MB
    Total amount of swap : 1022 MB
    System uptime : 11:15,
    Download speed from CacheFly: 50.8MB/s
    Download speed from Coloat, Atlanta GA: 14.0MB/s
    Download speed from Softlayer, Dallas, TX: 15.4MB/s
    Download speed from Linode, Tokyo, JP: 7.89MB/s
    Download speed from i3d.net, Rotterdam, NL: 46.8MB/s
    Download speed from Leaseweb, Haarlem, NL: 44.7MB/s
    Download speed from Softlayer, Singapore: 7.22MB/s
    Download speed from Softlayer, Seattle, WA: 12.2MB/s
    Download speed from Softlayer, San Jose, CA: 12.6MB/s
    Download speed from Softlayer, Washington, DC: 22.8MB/s
    I/O speed : 79.9 MB/s

    UPDATE:

    For comparison, here an INIZ KVM VPS

    wget freevps.us/downloads/bench.sh -O - -o /dev/null|bash

    CPU model :  QEMU Virtual CPU version (cpu64-rhel6)
Number of cores : 2
CPU frequency :  2099.998 MHz
Total amount of ram : 502 MB
Total amount of swap : 0 MB
System uptime :   1:06,
Download speed from CacheFly: 80.4MB/s
Download speed from Coloat, Atlanta GA: 3.61MB/s
Download speed from Softlayer, Dallas, TX: 3.11MB/s
Download speed from Linode, Tokyo, JP: 1.34MB/s
Download speed from i3d.net, Rotterdam, NL: 2.16MB/s
Download speed from Leaseweb, Haarlem, NL: 1.65MB/s
Download speed from Softlayer, Singapore: 997KB/s
Download speed from Softlayer, Seattle, WA: 2.82MB/s
Download speed from Softlayer, San Jose, CA: 3.11MB/s
Download speed from Softlayer, Washington, DC: 29.9MB/s
I/O speed :  588 MB/s

    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, 1.70605 s, 629 MB/s
  • lukenstinelukenstine Member

    when i run dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
    i get these results:
    16384+0 records in 16384+0 records out 1073741824 bytes (1.1 GB) copied, 12.9124 s, 83.2 MB/s

  • jcalebjcaleb Member

    83 is ok.

  • lukenstinelukenstine Member

    @jcaleb said:
    83 is ok.

    alright

  • shovenoseshovenose Member, Host Rep

    Something to keep note of: weak CPUs like Atom, Via, etc. will hold back disk IO performance.

  • lukenstinelukenstine Member
    edited February 2014

    someone explain this to me. after i run this command hdparm -tT /dev/sda i get these results

    `# hdparm -tT /dev/sda

    /dev/sda:
    Timing cached reads: 1440 MB in 2.00 seconds = 720.23 MB/sec
    Timing buffered disk reads: 146 MB in 3.04 seconds = 48.09 MB/sec`

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