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Writes to my WD Caviar Green 2TB hard drive are exceedingly slow. When dpkg is setting up packages atop reports speeds of between 0.5 and 1 MB/s. AHCI is enabled in my bios. I bought the drive new. What could be wrong? What can I do to troubleshoot?
This is on Ubuntu 11.10. 3 partitions are 1%, 5% and 50% used respectively.
edit: I had originally misidentified the drive as my SSD drive but later found my mistake when running a benchmark to troubleshoot.
edit2: File system is btrfs.
How have you isolated this as being a disk speed issue? dpkg does various things when setting up a package, only a subset is writing to the disk. It could be slow decompressing for example. – Paul – 2011-11-02T23:46:57.470
I was using the output of atop which indicated 100% "busy" and had DSK=100% for dpkg. – user64996 – 2011-11-03T00:30:36.557
DSK=100% for
dpkg
just meansdpkg
is accounting for 100% of the system's disk usage. – David Schwartz – 2011-11-03T00:32:29.080Yes, see my comment to your answer where I explain that the system usage indicated 100% "busy". – user64996 – 2011-11-03T00:43:13.483