Putting grub back on new mirror disk

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Have a computer with 4 500Gb seagate drives setup in 2 mirror pairs. The first pair, sda/sdb have 3 partitions, Boot/os/programs, Swap, data/storage for vdr.

I've had to replace drives several times. These seagates are junk, but warranty is up this year and then, if I manage to get some money, I'd like to replace them with a pair of WD 1Tb reds.

This time it was sda that went bad. Got it replaced, got the partitions back in the arrays and no sign of errors during rebuilds. but when I tried to put grub back on, I got some kind of error. Thought I did it the same way I've done it before, the way I was told in #grub.

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vorg@x64VDR:~$ su
Password:
x64VDR:/home/vorg# grub-install /dev/sda && grub-install /dev/sdb
/usr/sbin/grub-probe: error: no such disk.
Auto-detection of a filesystem of /dev/md0 failed.
Please report this together with the output of "/usr/sbin/grub-probe --device-map=/boot/grub/device.map --target=fs -v /boot/grub" to <bug-grub@xxxxxxx>
x64VDR:/home/vorg# exit
exit
vorg@x64VDR:~$
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