what is Disk I/O Usage and why on my cpanel it shows it in full red?

I/O (input/output defined as KB/s) is just the “throughput” or speed of data transfer between the hard disk and the RAM. On a server, a disk I/O describes every process that involves writing to or reading from a storage device which on a shared web hosting server will be the hard disk drive, or HDD. I/O processes to an HDD are particularly slow when compared with solid-state memory such as RAM, HDD I/O is, on average, 2,000 times slower.

In a web hosting environment, a web server must support hundreds perhaps thousands of sites simultaneously while creating a well-balanced server environment. The more accounts your provider stuffs on the server, the more noticeable slow disk I/O becomes. While any decent web hosting will not place hard limits on most of the resources, there are some that need to be proactively regulated so that one individual or account do not consume everything.

Most Linux servers in today’s shared hosting environment runs Apache web servers. And, most of these support CGI and FastCGI scripts – written in a number of languages, such as Perl, Python, and the most popular, PHP. A single site potentially can consume all CPU, IO, Memory resources or Apache processes and this may bring the server to a complete grinding halt.

These limits are designed or rather configured to make sure that no single web site can bring down the web server which will affect everyone else.

As you may have noticed, your website doesn’t throw up any noticeable error (sometimes you may see 508 error; again that will depend on how the server is configured) when you exceed your i/o limit. What will happen is that it will the site start responding slower or just “hangs” unable to fulfill the request which typically (do bear in mind that there may be other reasons why this happens) is to transfer data from the hard disk to the RAM. Simply put, it is a limit that when you reach your assigned or subscribed limit, the processes are throttled (put to sleep).

Again, any decent hosting company will grant you what is termed as “soft limit” whereby if you exceeds it, your site will not hang but you will receive warning depending on the setup.

Then, there is the “hard limit” which when you exceed … well, you hang.

In our own environment, we have an in-house systems that make sure that no matter what any customers does, it will never affect other customers on the machine. This control resources being used by all processes for any single account. This eliminates the noisy, bad neighbor effect, improve our server’s stability, and give every webmaster on the server real bang for his/her bucks.

In fact, we have configured:

Soft Limit so that when customers exceed their resource allocations the site will slow down but not hang to accommodate web owners who temporarily exceed inode restrictions.

Hard Limit mode where it would be impossible to create new files and folders after these allocations have been used up.

What will happen is that when:

* a user hits max entry processes limits — we display 508 Resource Limits Reached
* a user hits CPU limit — site will be slow. This often causes surge in connections, hitting max entry processes and 508 error. The account consuming too many resources will temporarily stop working until their resource usage returns to normal. Meanwhile, the other tenants on the server will continue to run normally.


if your site is a wordpress install the plugin performance profiler, this will try to find out which of your plugins is using more resources.

Second install a cache something like W3 total cache this will keep most of your  pages on the RAM and the disk will not be used so often.

Third, optimize your sites/account performance to ensure they doesn’t hit your account resource limits anymore. On cpanel go to Optimize Website and compress all the content.

Last, on cpanel click on cloudflare, put all your sites on cloud, this will make your site load faster, it will save your I/O and even protect your sites from some hacking systems. Read about our partnership with cloudflare. If your package is Video Three or above, contact support to enable CloudFlare Railgun™ technology on your sites, Railgun achieves a 99.6% compression ratio for previously uncacheable web objects by using techniques similar to those used in the compression of high-quality video. The average website can expect a 1.43x performance increase. Read more about it at Railgun.

You can also upgrade to a higher package or to something more robust.

33 thoughts on “what is Disk I/O Usage and why on my cpanel it shows it in full red?”

  1. I was suggested this website by my web developer. I’m not sure whether this post is written by him as no one else know such detailed about my problem. my sites are loading very slow and my server admin says it is because of the I/O usage. How can I solve the issue?

  2. Whoa! This blog looks just like my old one! It’s on a totally different topic but it has pretty much the same problem. It is very important to understand the I/O disk usage, sometimes you have lots of RAM but still the server is slow and it is because of the I/O usage.

  3. And just so you understand, this is the same technique I use to drive website traffic. The markets have been flooded with a variety of products including the cheap, costly and duplicitous hard disks, but I think with SATA hard disks the I/O disk usage can be mitigated..

  4. Conduct a reference check to see if the provider will suit your practice or not. Moreover, regular hard disks use also causes damage to the sites loading slowness. Of course when these server admins find the answer that the need, they typically come back to quality hard drives until they have yet another question. Along with it comes physical and damage to the sites.

  5. Reliable hosting companies have billing services provided by a reliable server and are very useful for server admins.One of the best ways to prepare for a live web site is to test yourself how your site loads fast. You have to keep a track of the number of clicks and visits their website receives which help them to identify which customers can be converted into actual customers. if your site is slow because of I/O usage this causes bootle neck and you lose customers.

  6. I’m really digging the issue of this blog. It’s simple, yet effective. A lot of times it’s challenging to get that “perfect balance” between superb usability and if your site is fast, if because your server is slow you losing customers. I must say you have done a amazing job with this. Also, the blog loads super quick for me on Internet explorer. what hard drive are you using?

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  8. In case you have any poor or noteworthy things, protect them apart or fill them operating in a tie down place. Once again thanks for the information about this issue with cpanel usage.

  9. Instead of reporting for work to get a decent pay, some can still do it while working from house. but as long as we have to share the information necessary to server management we can cope.

  10. what hard disk type you use? I’m looking for SATA hard disks. I/O usage is very useful information, thanks.

  11. This is a very good tip particularly to those fresh to server admins. Just yesterday my customer was asking about this on the cpanel, I used your info to explain to him.
    Simple but very accurate info. Many thanks for
    sharing this one. A must read article!

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  25. Hey, how’s it going?

    I want to pass along some very important news that everyone needs to hear!

    In December of 2017, Donald Trump made history by recognizing Jerusalem as the capital of Israel. Why is this big news? Because by this the Jewish people of Israel are now able to press forward in bringing about the Third Temple prophesied in the Bible.

    Jewish Rabbis have publicly announced that their Messiah will be revealed in the coming years who will be a leader and spiritual guide to all nations, gathering all religions under the worship of one God.

    Biblical prophecy tells us that this Jewish Messiah who will take the stage will be the antichrist “who opposes and exalts himself above all that is called God or that is worshiped, so that he sits as God in the temple of God, showing himself that he is God” (2 Thessalonians 2:4). For a time he will bring about a false peace, but “Therefore when you see the ‘abomination of desolation,’ spoken of by Daniel the prophet, standing in the holy place (Matthew 24:15)…then there will be great tribulation, such as has not been since the beginning of the world until this time, no, nor ever shall be” (Matthew 24:21).

    More importantly, the power that runs the world wants to put a RFID microchip in our body making us total slaves to them. This chip matches perfectly with the Mark of the Beast in the Bible, more specifically in Revelation 13:16-18:

    “He causes all, both small and great, rich and poor, free and slave, to receive a mark on their right hand or on their foreheads, and that no one may buy or sell except one who has the mark or the name of the beast, or the number of his name.

    Here is wisdom. Let him who has understanding calculate the number of the beast, for it is the number of a man: His number is 666.”

    Referring to the last days, this could only be speaking of a cashless society, which we have yet to see, but are heading towards. Otherwise, we could still buy or sell without the mark amongst others if physical money was still currency. This Mark couldn’t be spiritual because the word references two different physical locations. If it was spiritual it would just say in the forehead. RFID microchip implant technology will be the future of a one world cashless society containing digital currency. It will be implanted in the right-hand or the forehead, and we cannot buy or sell without it. Revelation 13:11-18 tells us that a false prophet will arise on the world scene doing miracles before men, deceiving them to receive this Mark. Do not be deceived! We must grow strong in Jesus. AT ALL COSTS, DO NOT TAKE IT!

    “Then a third angel followed them, saying with a loud voice, “If anyone worships the beast and his image, and receives his mark on his forehead or on his hand, he himself shall also drink of the wine of the wrath of God, which is poured out full strength into the cup of His indignation. He shall be tormented with fire and brimstone in the presence of the holy angels and in the presence of the Lamb. And the smoke of their torment ascends forever and ever; and they have no rest day or night, who worship the beast and his image, and whoever receives the mark of his name” (Revelation 14:9-11).

    People have been saying the end is coming for many years, but we needed two key things. One, the Third Temple, and two, the technology for a cashless society to fulfill the prophecy of the Mark of the Beast.

    Visit http://WWW.BIBLEFREEDOM.COM to see proof for these things and why the Bible truly is the word of God!

    If you haven’t already, it is time to seek God with all your heart. Jesus loves you more than you could imagine. He wants to have a relationship with you and redeem you from your sins. Turn to Him and repent while there is still hope! This is forever…God bless!


    We all know God exists. Why? Because without Him, we couldn’t prove anything at all. Do we live our lives as if we cannot know anything? No. So why is God necessary? In order to know anything for certain, you would have to know everything, or have revelation from somebody who does. Who is capable of knowing everything? God. So to know anything, you would have to be God, or know God.

    A worldview without God cannot account for the uniformity and intelligibility of nature. And why is it that we can even reason that God is the best explanation for this if there is no God? We are given reason to know or reject God, but never to know that He does not exist.

    It has been calculated by Roger Penrose that the odds of the initial conditions for the big bang to produce the universe that we see to be a number so big, that we could put a zero on every particle in the universe, and even that would not be enough to use every zero. What are the odds that God created the universe? Odds are no such thing. Who of you would gamble your life on one coin flip?

    Is there evidence that the Bible is the truth? Yes. Did you know that the creation accounts listed in the book of Genesis are not only all correct, but are also in the correct chronological order? That the Bible doesn’t say the Earth was formed in six 24-hour days but rather six long but finite periods of time? That the Bible makes 10 times more creation claims than all major “holy” books combined with no contradictions, while these other books have errors in them? The Bible stood alone by concurring with the big bang saying, “In the beginning God created the heaven and the earth” (Genesis 1:1); and says our universe is expanding, thousands of years before scientists discovered these things. Watch a potential life-changing video on the front page of http://WWW.BIBLEFREEDOM.COM with Astronomer(PhD) Hugh Ross explaining all these facts based on published scientific data. He has authored many books, backed even by atheist scientists.

    Jesus came to pay a debt that we could not; to be our legal justifier to reconcile us back to a Holy God; only if we are willing to receive Him: “For the wages of sin is death…” (Romans 6:23).

    God so loved the world that He gave us His only begotten son, so that whoever believes in Him, through faith, shall not perish, but have everlasting life. Jesus says if we wish to enter into life to keep the commands! The two greatest commands are to love God with all your heart, soul, strength, and mind; and your neighbor as yourself. All the law hang on these commands. We must be born of and lead by the Holy Spirit, to be called children of God, to inherit the kingdom. If we are willing to humble ourselves in prayer to Jesus, to confess and forsake our sins, He is willing to give the Holy Spirit to those who keep asking of Him; giving us a new heart, leading us into all truth!

    Jesus came to free us from the bondage of sin. The everlasting fire was prepared for the devil and his angels due to disobedience to God’s law. If we do the same, what makes us any different than the devil? Jesus says unless we repent, we shall perish. For sin is the transgression of the law. We must walk in the Spirit so we may not fulfill the lusts of the flesh, being hatred, fornication, drunkenness and the like. Whoever practices such things will not inherit the kingdom (Galatians 5:16-26). If we sin, we may come before Jesus to ask for forgiveness (1 John 2:1-2). Evil thoughts are not sins, but rather temptations. It is not until these thoughts conceive and give birth by our own desires that they become sin (James 1:12-15). When we sin, we become in the likeness of the devil’s image, for he who sins is of the devil (1 John 3:8); but if we obey Jesus, in the image of God. For without holiness, we shall not see the Lord (Hebrews 12:14).

    The oldest religion in the world is holiness through faith (James 1:27). What religion did Adam and Eve follow before the fall? Jesus, Who became the last Adam, what religion does He follow? Is He not holy? He never told us to follow the rituals and traditions of man but to take up our cross and follow Him (Luke 9:23). There are many false doctrines being taught leading people astray. This is why we need the Holy Spirit for discernment. Unlike religion, holiness cannot be created. It is given to us from above by the baptism of the Spirit. Jesus is more than a religion; He is about having a personal relationship with the Father. Start by reading the Gospel of Matthew, to hear the words of God, to know His character and commandments. Follow and obey Jesus, for He is the way, the truth, and the life!

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