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% of filled HD = slow?

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Hello!
System (this is my main DE PC) openSUSE 13.1_64, KDE 4.11.4, APU AMD A3850, 4GM Ram, HD WDC WD8000AARS-0(800GB) Rev 80.0 . File system Ext4.

I think that I have read that Linux HD's doesn’t have to be defragmented, but when you reach a certain grade of >Xn% full it's getting slower. I did a quick backup to my DE HD for some (for me) important Dir/files.

Code:

# df
Filesystem        1K-blocks      Used Available Use% Mounted on
/dev/sda2          20510716  13627096  5818664  71% /
devtmpfs            1752400        44  1752356  1% /dev
tmpfs                1766752      2812  1763940  1% /dev/shm
tmpfs                1766752      7212  1759540  1% /run
tmpfs                1766752        0  1766752  0% /sys/fs/cgroup
tmpfs                1766752      7212  1759540  1% /var/lock
tmpfs                1766752      7212  1759540  1% /var/run
/dev/sda3          746311160 633170524 112365912  85% /home
192.168.0.1:/home 1419298816 785635328 561544192  59% /home/****/ss

OK, - I need to look into the tread "The wisdom of emptying tmp at boot time" in the forum. A large / but this installation have been around for some time and had been updated on the run (rolling) to newer versions of openSUSE. I deleted /tmp and:

Code:

# df
Filesystem        1K-blocks      Used Available Use% Mounted on
/dev/sda2          20510716  10279188  9166572  53% /
devtmpfs            1752400        44  1752356  1% /dev
tmpfs                1766752      2824  1763928  1% /dev/shm
tmpfs                1766752      7224  1759528  1% /run
tmpfs                1766752        0  1766752  0% /sys/fs/cgroup
tmpfs                1766752      7224  1759528  1% /var/lock
tmpfs                1766752      7224  1759528  1% /var/run
/dev/sda3          746311160 633171416 112365020  85% /home
192.168.0.1:/home 1419298816 785635328 561544192  59% /home/****/ss

The HD sounds like that a handful of gravel have been throw in to it when new programs started and it's painfully slow.

Is this "normal" ?

regards

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