Re: single disk reed solomon codes

Ahmed Kamal
2008-07-21T07:40:06Z

I definitely hope btrfs has this per-object "copies" property too.
However, simply replicating the whole contents of a directory, wastes
too much disk space, as opposed to RS codes

On Mon, Jul 21, 2008 at 9:48 AM, Tomasz Torcz <tomek@crocom.com.pl> wrote:
> Dnia 2008-07-19, sob o godzinie 17:18 +0200, Gerald Nowitzky pisze:
>
>> In the end, you would add very little security by the price of -at least-
>> cutting half your write performance. Thus, I don't think there is any point
>> in adding redundancy to single disk systems.
>
> ZFS can store multiple copies of data block within one disk. Using
> your words, it's like "Intra-Disk-RAID1". After reading data, when
> checksum shows it's corrupted, another copy (hopefully correct) is read
> from other disk location.
> This is adding security by the price of half storage capacity. Which
> seems like a fair game, given todays 1,5TB HDDs.
>
> --
> Tomasz Torcz
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
>