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Raevyn 10-26-2012 04:00 PM

Write Speeds for HDD and SSD

I was just curious.. I am considering purchasing a SSD Samsung drive for use on my Linux system. After examining my used space I have found I only take up 16.6GB of total drive space for everything but /home. So obviously I dont really need a huge drive and feel 64GB is plenty.

However I have noticed that different capacities have different write speeds. 64GB is 160MB/s while 128GB is 320MB/s. Anything higher is just silly waste of money to me as it wont really be used, since /home will be another hard disk I have.

So my question is, for Linux does the write speed really make a huge diff? Or maybe a better way to ask this is: Will I notice any difference between a white speed of 160 and 320? Both drives have read speeds of I think 520MB/s so, thats not a factor right now.

TobiSGD 10-26-2012 05:01 PM

Most of the time your OS will not write to but read from the system partition. A higher write speed may possibly noticed when you do things in your /tmp, like compiling, but I would not worry about that, if you have enough RAM just mount /tmp as tmpfs.

Raevyn 10-26-2012 06:02 PM

Thank you and you bring up a great idea about using /tmp. I have 16GB of ram but soon it will 32 (upgrade) so how much would you suggest I should make in ram of /tmp?

TobiSGD 10-26-2012 06:09 PM

tmpfs is only taking the amount of RAM that is actually used, but by default not more than 50% of the RAM. I have the default configuration on my machine with 16GB RAM, so it takes maximum 8GB, and never had a problem with that.

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