On Tue, May 8, 2012 at 2:13 PM, Clemens Eisserer <linuxhi...@gmail.com> wrote: > Hi, > > I have a quite unreliable SSD here which develops some bad blocks from > time to time which result in read-errors. > Once the block is written to again, its remapped internally and > everything is fine again for that block. > > Would it be possible to create 2 btrfs partitions on that drive and > use it in RAID1 - with btrfs silently repairing read-errors when they > occur? > Would it require special settings, to not fallback to read-only mode > when a read-error occurs?
The problem would be how the SSD (and linux) behaves when it encounters bad blocks (not bad disks, which is easier). If it does "oh, I can't read this block. I just return an error immediately", then it's good. However, in most situation, it would be like "hmmm, I can't read this block, let me retry that again. What? still error? then lets retry it again, and again.", which could take several minutes for a single bad block. And during that time linux (the kernel) would do something like "hey, the disk is not responding. Why don't we try some stuff? Let's try resetting the link. If it doesn't work, try downgrading the link speed". In short, if you KNOW the SSD is already showing signs of bad blocks, better just throw it away. -- Fajar -- 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
