Igor M <igor...@gmail.com> writes:

> Why btrfs becames EXTREMELY slow after some time (months) of usage ?

Have you tried iostat from sysstat to see the number of IO-operations
performed per second (tps) on the devices when it is performing badly?

If the number is hitting your seek rate (ie. 1/0.0075 for 7.5 ms seek =
133), then fragmentation is sure to be blamed.

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