On Sat, Jan 3, 2015 at 10:40 PM, Dyweni - BTRFS <y4bwxfpc4...@dyweni.com> wrote: > Hi All, > > Can BTRFS ignore bad blocks as they are discovered? > > I want to try BTRFS on some older drives, but they all have a few bad > blocks.
Not currently, and I don't see it in the project ideas list. Right now on Btrfs you will just get write errors, but I'm uncertain if it just tries a new sector and continues on (indirectly not use the bad sector but also not keeping track of it either)? The unreliable disk features are still project ideas. If the drives no longer have reserve sectors, then technically they're toast. That's indicated by write failure in dmesg. Two work arounds: use ext4 with mkfs.ext4 -c which builds a bad blocks list and then won't use those sectors; mdadm 3.1+ has an option to build a bad blocks list also but I don't know if raid0 or linear/concat are supported: http://thread.gmane.org/gmane.linux.raid/34883 If you haven't tried it, badblocks -wvs will (destructively) write over the entire block device, and the drive firmware should detect persistent write failures automatically and remap the LBA to a reserve sector, removing the bad sector from use. This is transparent to everything outside the drive. Once reserve sectors are depleted then the drive will report write failure. -- Chris Murphy -- 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
