On Thu, Sep 17, 2015 at 07:56:08PM +0200, Gert Menke wrote: > Hi, > > thank you for your answers! > > So it seems there are several suboptimal alternatives here... > > MD+LVM is very close to what I want, but md has no way to cope with > silent data corruption. So if I'd want to use a guest filesystem > that has no checksums either, I'm out of luck. > I'm honestly a bit confused here - isn't checksumming one of the > most obvious things to want in a software RAID setup? Is it a > feature that might appear in the future? Maybe I should talk to the > md guys... > > BTRFS looks really nice feature-wise, but is not (yet) optimized for > my use-case I guess. Disabling COW would certainly help, but I don't > want to lose the data checksums. Is nodatacowbutkeepdatachecksums a > feature that might turn up in the future? [snip]
No. If you try doing that particular combination of features, you end up with a filesystem that can be inconsistent: there's a race condition between updating the data in a file and updating the csum record for it, and the race can't be fixed. Hugo. -- Hugo Mills | I spent most of my money on drink, women and fast hugo@... carfax.org.uk | cars. The rest I wasted. http://carfax.org.uk/ | PGP: E2AB1DE4 | James Hunt
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