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Increase size of swap partition

Discussion in 'General Discussion' started by Janak, Jul 19, 2009.

  1. Janak

    Janak Well-Known Member

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    I was wondering if it is possible to increase the size of swap partition. If yes the how can I increase it?

    Thanks!
     
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    #1 Janak, Jul 19, 2009
  2. Janak

    Janak Well-Known Member

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    I found the solution. No need to reply this thread.

    Open SSH and run below commands:

    dd if=/dev/zero of=/usr/swap-file bs=1024 count=2048000
    mkswap /usr/swap-file
    swapon /usr/swap-file
    swapon -s

    Now add the following to the /etc/fstab and you are done.

    /usr/swap-file swap swap defaults 0 0

    I found this from Blogs | eth0.us - Server admin info for cPanel, plesk, ensim and linux!

    Thanks!
     
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    #2 Janak, Jul 19, 2009
    Arash Mehmandoost likes this.
  3. Eric

    Eric Administrator Staff Member

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    That is one way to do it. Swap is really good at spreading the load across the system. So if you give swap 1 gig on 4 drives it'll equal out the load. It's a real neat feature, I donate a gig to swap on each hardware device in hopes of speeding things up over all.

    Most of the time, if I'm swapping something is either really wrong, or it's time to get more ram. :D
     
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    #3 Eric, Jul 19, 2009
  4. eth00

    eth00 Well-Known Member PartnerNOC

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    Also don't forget that swap is basically RAM but on the hard drive, so it is a lot slower. If you are starting to swap a lot your IOwait is probably going to very quickly increase which is going to bog down your server pretty quickly. You probably should look at optimizing or adding in some more RAM if you need more swap constantly.
     
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    #4 eth00, Jul 20, 2009
  5. thewebhosting

    thewebhosting Well-Known Member

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    To use a RAID Drive is also a better option to decrease number of Disk I/O.
     
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    #5 thewebhosting, Jul 20, 2009
  6. eth00

    eth00 Well-Known Member PartnerNOC

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    While true it is MUCH cheaper just to add in more RAM unless you are at the servers max -- even then upgrading may still be cheaper then RAID.
     
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    #6 eth00, Jul 20, 2009
  7. david510

    david510 Well-Known Member

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    It is always not recommended to increase the swap to high values.
     
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    #7 david510, Jul 21, 2009
  8. Janak

    Janak Well-Known Member

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    Ok..I think I should upgrade RAM first and then think about SWAP if required.
     
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    #8 Janak, Jul 22, 2009
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