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  1. #1
    Join Date
    Nov 2003
    Location
    Royal Palm Beach, Florida
    Posts
    105

    When is it time to 'move up'?

    Whether it be simply adding memory - or moving to a better processor - how do you distinguish that point? Do you look at server load? What number would mean "Okay, it's time".. How about memory being used? Swap? I'm not sure what swap is about yet...

    Thanks...

  2. #2
    When a lot of your swap is being used, your server feels unresponsive, when your clients start complaining everything's too slow... you'll just know.

    Matt

  3. #3
    Join Date
    Jan 2002
    Location
    UK
    Posts
    1,541
    when the server load gets too high, either upgrade the server or stop putting new accounts on there.

  4. #4
    Join Date
    Aug 2003
    Posts
    2,734
    Probably when the server resources are overloaded causing a slower response time.

  5. #5
    Join Date
    Nov 2003
    Location
    Royal Palm Beach, Florida
    Posts
    105
    Thank you for the responses.. What is a lot of swap? Is there a number that's generally too high?

  6. #6
    Join Date
    May 2003
    Posts
    475
    when a page is needed, it will be stored in the ram so that the page can be used. So what if some pages are needed but there is no more free space in ram? the system will kick out some pages in the ram, may need to save them back to the disk if they are modified, and finally load the required page to the free space, and this process is called swapping, which takes lots of time
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  7. #7
    Join Date
    Nov 2003
    Location
    Royal Palm Beach, Florida
    Posts
    105
    Hmm.. Sounds complicated.. Is 0.817 % swap ok? At what point does it start getting dangerous?

  8. #8
    Join Date
    Nov 2003
    Location
    Royal Palm Beach, Florida
    Posts
    105
    So.. At what percentage of swap does one start worrying?

  9. #9
    it's not as trivial as this. there are off hours, peak hours, peak weekdays, etc. you have to at least analyze your weekly mrtg graph (memory, swap, bandwidth, disk I/O) to see whats up.

    or, as many newbie hosts do, just wait until users start complaining or your server starts crashing, that's a good indication too.

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