As I was writing a different blog post, I came across this interesting situation. I couldn’t create the same partition layout on the new drive.
This is the existing drive:
root@r730-04:~ # gpart show ada0
=> 40 242255584 ada0 GPT (116G)
40 532480 1 efi (260M)
532520 2008 - free - (1.0M)
534528 16777216 2 freebsd-swap (8.0G)
17311744 224942080 3 freebsd-zfs (107G)
242253824 1800 - free - (900K)
root@r730-04:~ #
I started to duplicate the layout on the new drive:
root@r730-04:~ # gpart create -s gpt da0
da0 created
root@r730-04:~ # gpart add -t efi -s 260M da0
da0p1 added
root@r730-04:~ # gpart add -t freebsd-swap -s 8G -a 4k da0
da0p2 added
root@r730-04:~ # gpart show da0
=> 40 1953525088 da0 GPT (932G)
40 532480 1 efi (260M)
532520 16777216 2 freebsd-swap (8.0G)
17309736 1936215392 - free - (923G)
root@r730-04:~ #
So why no 1M free between partition 1 and 2?
I can do this instead (after destroying the partitions on da0, not shown here):
root@r730-04:~ # gpart backup ada0 | gpart restore da0
root@r730-04:~ # gpart show da0
=> 34 1953525101 da0 GPT (932G)
34 6 - free - (3.0K)
40 532480 1 efi (260M)
532520 2008 - free - (1.0M)
534528 16777216 2 freebsd-swap (8.0G)
17311744 224942080 3 freebsd-zfs (107G)
242253824 1711271311 - free - (816G)
root@r730-04:~ #
Next, I resize the last partition to use up what is availble:
root@r730-04:~ # gpart resize -i 3 -a 4k da0
da0p3 resized
root@r730-04:~ # gpart show da0
=> 34 1953525101 da0 GPT (932G)
34 6 - free - (3.0K)
40 532480 1 efi (260M)
532520 2008 - free - (1.0M)
534528 16777216 2 freebsd-swap (8.0G)
17311744 1936213384 3 freebsd-zfs (923G)
1953525128 7 - free - (3.5K)
I’ll go with this one.
