Re: Balance & scrub & defrag

[Erkki Seppala <flux-btrfs@inside.org>]

Robert White <rwhite@pobox.com> writes:

> You need to buy better disks. 8-)

Where can one buy these better disks with reasonable prices?-) Disks are
best thought of as consumables.

> I use SMART (smartmontools etc) and its tests to keep track of and
> warn me of such issues. It's way more likely to catch incipient media
> failures long before scrub would.

That may be sort of true, but I think even SMART is helped by the fact
that the media is read through from the beginning to the end*, so it can
detect even the errors that don't bubble through the IO layer. And BTRFS
can indeed note errors that the media doesn't - two checksums is better
than one checksum, assuming they aren't exactly the same algorithm ;).

Do you alternatively execute SMART self tests?

* scrub doesn't do this, it reads only through used data

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