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So, I finally bought the Linux desktop of my dreams: fast CPU, 32GB RAM, SSD RAID, running Ubuntu. I get it home, turn it on, and ALL hard drives are slow, writing at about 1 MB/second. This includes both internal and external drives: the internal SSD RAID (3ware 9750-4i card), an internal Western Digital Red (not on the RAID card), and external drives using USB 3.0, Firewire, and eSATA. This is on Ubuntu 12.04 LTS (kernel 3.5). I also tested using Ubuntu Live CDs for 13.04 (kernel 3.8) and prerelease 13.10 (kernel 3.11), and the problem remained. HOWEVER... when I boot on a Knoppix 7.2 live CD (kernel 3.9), the problem completely goes away and all drives are fast. Here's a 20MB file being copied from the SSD to itself on Ubuntu, which takes 15 seconds: $ time cp bigfile bigfile2 real 0m15.030s user 0m0.052s sys 0m0.000s Now here is Knoppix: $ time cp bigfile bigfile2 real 0m0.034s user 0m0.000s sys 0m0.013s Likewise, when I boot into Windows 7 (it's a dual boot machine), the drives are perfectly fast.
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