Wolf posted on Mon, 08 Jan 2018 23:27:27 +0100 as excerpted: > I'm running btrfs scrub on my raid each week (is that too often?) and > I'm having a problem that it reports corruption, says it's repaired but > next week reports it again.
I won't attempt to answer the larger question, but on the narrow "too often?" question, no, running scrub once a week shouldn't be a problem. Scrub is read-only unless it finds errors, so even running it repeatedly end-to-end shouldn't be a problem, other than the obvious performance issue and the potential increased head-seek wear on non-ssd devices. The obvious issue would be slowing down whatever else you're doing at the same time, and at whatever presumably scheduled weekly time you run it that's evidently not a problem for your use-case. Also, a bit OT as I don't believe it's related to this, but FWIW... There *has* been a recent kernel issue with gentoo-hardened compiling kernel code incorrectly due to a gcc option enabled by default on hardened. I don't remember the details, but I ran across in in one of the kernel development articles I read. I /think/ it applied only to 4.15-rc, however, or possibly 4.14. The fix is to disable that specific gcc option when building the kernel, as it was designed for userspace and doesn't make much sense for the kernel anyway. A patch doing just that should already be part of the latest 4.15-rcs and if the bug applied to 4.14 it'll be backported there as well, but I'm not sure of current 4.14- stable status. (I run gentoo, so my interest perked when I came across the discussion, but not hardened, so I didn't need to retain the details.) If you're not already aware of that, you might wish to research it a bit more, and disable whatever option manually in your kernel-build CFLAGS, tho as mentioned once the patch is applied the kernel make files automatically apply the appropriate option. (The official kernel CFLAGS related vars are KCFLAGS (C), KCPPFLAGS (pre-processor), and KAFLAGS (assembler).) Unfortunately IDR what the specific flag was, -fno-something, IIRC. -- Duncan - List replies preferred. No HTML msgs. "Every nonfree program has a lord, a master -- and if you use the program, he is your master." Richard Stallman -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
