Just to close this out. The making a 4TB image file of the raid0 was
not feasible for me so I ended up using a commercial raid recovery app
that could handle the 512 byte chunk.
Thanks for your help. -V
On 8/31/13, Roman Mamedov <rm@xxxxxxxxxxx> wrote:
> On Sat, 31 Aug 2013 01:05:44 -0400
> Veedar Hokstadt <veedar@xxxxxxxxx> wrote:
>
>> I am totally aware of the complications involved but if I can somehow
>> build a raid0 / chunk 512B array with mdadm using the raw Lacie dives
>> then I can take it from there to recover the data.
>
> You can write a simple program to read in chunks of 512 bytes from one
> drive,
> then from the other, piece this together and write to some third file. Here
> is
> something quick that I modified from a tool I already had. Even though it's
> doing the tight loop in PHP, it seems to do about 100 MB/sec reading from
> two
> SATA drives and writing to a file on a RAID6 in my system.
>
> --- merge.php ---
>
> #!/usr/bin/php
> <?php
> $f = array();
> array_shift($argv);
> foreach($argv as $arg) {
> if(($f[] = @fopen($arg, "rb"))===false) die("Unable to open file
> $arg.\n");
> }
> while(@$feof_cnt<2) {
> $feof_cnt=0;
> foreach($f as $file) {
> print(fread($file, 512));
> if(feof($file))$feof_cnt++;
> }
> }
> ?>
>
> ---
>
> Usage: ./merge.php /dev/sda /dev/sdb > image.img
>
> And you will need somewhere to store this image.img that's has the free
> space
> to fit the size of sda+sdb. Also check that you specify the drives in the
> proper order (only 2 tries, really).
>
> --
> With respect,
> Roman
>
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