On kernel 3.8.13:

Using two equal performance SATAII HDDs, formatted for btrfs raid1 for
both data and metadata and:

The second disk appears to suffer about x8 the read activity of the
first disk. This causes the second disk to quickly get maxed out whilst
the first disk remains almost idle.

Total writes to the two disks is equal.

This is noticeable for example when running "emerge --sync" or running
compiles on Gentoo.


Is this a known feature/problem or worth looking/checking further?

Regards,
Martin

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