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  1. #1
    Join Date
    Jan 2007
    Posts
    360

    I have a 500gb hard drive, but only 434 usable?

    Hello,

    I got a new dedicated server and it came with 500gb. But after fresh OS reinstall, it only shows 434 as available?

    Filesystem Size Used Avail Use% Mounted on
    /dev/sda2 458G 939M 434G 1% /
    tmpfs 988M 0 988M 0% /dev/shm
    /dev/sda1 192M 24M 159M 13% /boot

    Using Centos. Please someone explain why this is, Thanks.

  2. #2
    Join Date
    Apr 2010
    Posts
    491
    Well a 500gb drive aka the marketing number is 465gb in reality. It's the difference between counted 1000 or the correct 1024. This is a pretty basic sysadmin concept, sales and marketing always lie.

  3. #3
    Join Date
    Jan 2007
    Posts
    360
    But, if you look at the size

    458G 939M 434G

    Its used 939mb, out of 458gb, so how does it leave 434gb?

  4. #4
    Join Date
    Apr 2010
    Posts
    491
    Quote Originally Posted by awaisuk View Post
    But, if you look at the size

    458G 939M 434G

    Its used 939mb, out of 458gb, so how does it leave 434gb?
    EXT and similar file system reserve space, if you fill it the performance goes through the floor so 5-10% gets reserved. man tune2fs or the equivalent for your fs type.

  5. #5
    Filesystems normally reserve some space when an OS is installed. It should be around 10%.

  6. #6
    Join Date
    Mar 2003
    Location
    WebHostingTalk
    Posts
    16,947
    OP: It is normal and you can relax :-)
    Specially 4 You
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    JoneSolutions.Com ( Jones.Solutions ) is on the net 24/7 providing stable and reliable web hosting solutions and services since 2001

  7. #7
    Join Date
    Mar 2010
    Location
    Lithuania
    Posts
    2,147
    No one wants to cheat you. Just calm down
    Andrius Petkus, Chief commercial officer @ Bacloud.com data centers.
    Build your cheap dedicated server, Affordable high power Windows SSD VPS
    Payment methods: Bitcoins, Credit cards, PayPal, WebMoney, Perfect Money, Safety Pay, Cashu, Bank transfer.

  8. #8
    Join Date
    Oct 2013
    Posts
    72

    Re: I have a 500gb hard drive, but only 434 usable?

    The difference you're seeing is between Gigabytes (GB) and Gibibytes (GiB). The output of the df command shows GiB and not GB which is the value used by manufacturers in many cases. It is perfectly normal to see what you are seeing.

  9. #9
    It means it's like 500000MB, they took 1GB as 1000MB not 1024MB

  10. #10
    Join Date
    Oct 2013
    Location
    Kansas City, MO
    Posts
    13
    It is fine, space missing is used by the OS, /tmp and /boot.

  11. #11
    Join Date
    Mar 2013
    Posts
    1,294
    This reminds me when I got my first server

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