Fwd: manually destriping a 4 drive raid5 with one missing drive

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Not sure if it's destrip or destripe but it's basically like puzzle
you take a block from each drive according to the layout you are using
e.g. Left symmetric and then write it down in that order computing
missing blocks from parity blocks - this way you would write an image
which you can mount without using mdadm. Data restoration companies
are using this technique.


On Friday, October 23, 2015, Piergiorgio Sartor
<piergiorgio.sartor@xxxxxxxx> wrote:
>
> On Fri, Oct 23, 2015 at 11:26:12AM +0200, Marek wrote:
> > I have a 4 2TB disk  raid5 512k 1.2.
> > one of the drives was accidentally wiped by ubuntu installation
> > (/dev/sda, first drive). The system has been rebooted forcefully
> > several times before this happened. Raid wouldn't come up after that.
> > The first drive has been -add ed back and a resync has been enforced.
> > What i'd like to do is to manually destrip the raid.
>
> Hi Marek,
>
> excuse my ignorance, but what does it mean "destrip" a RAID?
>
> Could you please point to some technical reference or, maybe,
> spend few more words to clarify the concept?
>
> Thanks,
>
> bye,
>
> --
>
> piergiorgio
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