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Re: Slow writes to disk

On Fri, Nov 02, 2018 at 07:27:41PM -0700, David Christensen wrote:
1.  Backup your data and configuration settings.

never a bad idea

3.  Download and run the manufacturer's diagnostic utility (Windows
may be required):

this is basically going to be the equivalent of smartctl -H, no need to
try to figure out how to run windows.

4.  Most likely, the manufacturer diagnostic will say the drive is
good.  This means the the problem is software -- e.g. bugs,
misconfiguration, incompatible packages, cruft, gremlins, etc..  Find
a disk benchmarking tool.  I use dbench:

Running a full blown disk benchmark isn't going to add anything at this point.

On Fri, Nov 02, 2018 at 02:56:06PM -0400, Stefan Monnier wrote:
Using what command line?

Various, tried from/to different partitions, with different
block sizes.

Well, it would be helpful to actually see one next time someone says "with what command line". :) What is the output if you run the following from a suitably large partition?
dd if=/dev/zero of=testfile.bin bs=64k count=300000 conv=fsync
dd if=testfile.bin of=/dev/null bs=64k remember to delete testfile.bin when you're done. That creates an 18GiB file; if you have more than 16GiB RAM you should increase the count.