Compare boot sectors MBR of two disks in raid1
I have 2 disks in software raid1 on linux (/dev/sda and /dev/sdb) and the second one is hot added and recovered. Is there a way to see if the system is able to boot from second disk? Can I compare the MBR (master boot records) of two hard drives?
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Answers: 1
You can extract first 512 bytes from each hard drive and compare them.
This two lines
will produce two files /tmp/bootsectorSDA.txt and /tmp/bootsectorSDB.txt - you can compare them. If they are different then probably you don't have MBR on second hard drive.
This two lines
dd if=/dev/sda of=/tmp/bootsectorSDA.txt bs=512 count=1
dd if=/dev/sdb of=/tmp/bootsectorSDB.txt bs=512 count=1
will produce two files /tmp/bootsectorSDA.txt and /tmp/bootsectorSDB.txt - you can compare them. If they are different then probably you don't have MBR on second hard drive.
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