Until not long ago, Linux was not able to boot from partitions under RAID. That meant that /boot partition can not be mirrored, but the rest of the data can. If that is how system was set-up, then all of the data was mirrored but there is no GRUB/boot setup on the spare HDD. You would need to copy data from /boot partition to "/boot2" (/boot partition on spare HDD) and install GRUB on spare HDD MBR. This can all be done from working system, no need to unplug anything.

You...

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Back in the early '80s, photography was my main hobby,including developing and printing. Black and white mostly, because monochrome prints were said to last longer than colour. After two or three years I lost interest in it. But now I've moved into the 21st century, and got round to buying a digital camera, a Sony DSC H55. A compact with quite a lot of features (must RTFM soon!).
I gave it a bit of a test run, using one of the easy "point & shoot" modes in the local cemetery....

I had to calculate the Installed-Size for a .deb control file recently. Here is the solution I came up with:

What it does? The code tries to construct a calculation string and feeds it to the command line calculator bc as follows:

1. use dpkg-deb to get the file size information out of the Debian package
2. sed away all characters before and after the

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