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Can someone explain I/O speed to me?
lukenstine
Member
in General
is this good or bad: I/O speed : 41.0 MB/s
Comments
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?
0 MB? lol no that's not normal. How does your VPS even run anything if you have 0 MB/sec write speed?
Sounds like the VPS is horribly broken, or the tests/script isnt working properly
Could you please share the benchmark command you are using?
more importantly, can you share the host you are with ?
im using online.net
wget freevps.us/downloads/bench.sh -O - -o /dev/null|bash
@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
dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
Try running the following command and post your I/O:
dd if=/dev/zero of=test bs=64k count=16k conv=fdatasync
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.
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
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.
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..
keep in mind this is the dedicated server for 9.99 euros a month
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
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
83 is ok.
alright
Something to keep note of: weak CPUs like Atom, Via, etc. will hold back disk IO performance.
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`