On 6/25/14, Hugo Mills <h...@carfax.org.uk> wrote: >> Storage is pretty cheap now, and to have multiple copies in btrfs is >> something that I think could be used a lot. I know I will use multiple >> copies of my data if made possible.
> The question is, why? If you have enough disk media errors to make > it worth using multiple copies, then your storage device is basically > broken and needs replacing, and it can't really be relied on for very > much longer. Because btrfs single data profile can detect bitrot but can not recover from it. Hardware Raid may be the solution. But you can not use it on a laptop, or backup usb drive. However, you can still have 2 partitions and mount them as Raid1. Ofcourse we all have backups. But loss of certain files in a big file set may have gone unnoticed if you do not scan though whole backup log each time. You will definetly lose some files unless you keep 5-10 years of incremental backups. Even if you keep them they are too susceptible to bitrots too. Thus, there is definetely a need for ensured/enhanced data integrity. Note that deduplication features of modern drives makes duplication useless unless you used encrypted disk. Regard, Imran -- 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
