An experiment of applying RS codes for protecting data, worth a look
http://ttsiodras.googlepages.com/rsbep.html
He overwrites a series of 127 sectors and still manages to correctly
recover his data. We all know disks give us unreadable sectors every
now and then, so at least on
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
Hi,
Since btrfs is someday going to be the default FS for Linux, and will
be on so many single disk PCs and laptops, I was thinking it should be
a good idea to insert some redundancy in single disk deployments. Of
course it can help with disk failures, since it's obviously a single
disk, but it
ECC codes like Reed-Solomon are very useful to recognize and locate random
bit-errors. On a HDD as a unit, as it is seen from OS level, I don't think
it will be of any help: When a HDD drive reads a sector from disk, it does a
whole bunch of error recognition and correction measures. Usually
On Sat, 2008-07-19 at 15:21 +0300, Ahmed Kamal wrote:
Hi,
Since btrfs is someday going to be the default FS for Linux, and will
be on so many single disk PCs and laptops, I was thinking it should be
a good idea to insert some redundancy in single disk deployments. Of
course it can help with
RS-based error correction for themselves. If we're unlucky in our choice
of error correction, it might even be possible to end up in a situation
where the only errors we'd _see_ are the ones which were uncorrectable.
but since at the FS level, the redundancy would be at a different
place,
Gerald Nowitzky wrote:
When a HDD drive reads a sector from disk, it does a
whole bunch of error recognition and correction measures. Usually there are,
at least, two layers of error correction with different bit spreads on it.
*If* this still isn't enough, it is very likely that the whole
On Sat, Jul 19, 2008 at 04:15:43PM -0600, Joe Peterson wrote:
Gerald Nowitzky wrote:
When a HDD drive reads a sector from disk, it does a
whole bunch of error recognition and correction measures. Usually there
are,
at least, two layers of error correction with different bit spreads on
