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Jevgeni Smirnov
Asked: 2013-05-24 21:54:45 +0800 CST

Mounting ssd. Expectations vs reality about server load

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I'v installed SSD on my server and moved tmp folder, mysql data folder and 2 most loaded websites(php) on it.

I'v expected that server load will fall a little bit, but it seems that it is on the same level as it was.

So the question is, should the server load decreased with ssd installation or installing an ssd is not a powerful mean to decrease load?

UPDATE 1

The system if Fedora. In general I struggle of CPU load, which is made mostly by MySQL.

My proposal is that mysql uses a lot of io ops, but might be I am wrong.

mysql

1 Answers

  1. If the server's performance is bounded by disk read time or load, adding an SSD will certainly help. If it is bound by RAM, disk writes, network, or CPU load, an SSD will not help.

    You should consider using top, iotop, and bwmon to see the data on this. top will show you memory usage and CPU usage, and is especially good for seeing what is going on in cases like this (though the results can be somewhat misleading on SMP systems). For instance, if all your CPU usage is going to hi, or hardware interrupts, the issue is likely disk (or sometimes network) related.

    If this is windows, ignore that and use resmon.exe to check load.

    This is a very broad topic, but hopefully this can point you in the right direction.

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