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== Rename a volume group == | |||
I have two disks (one is a 'dd' copy of the other) and so they have identical volume names '/dev/magnia'. How do I change one? | I have two disks (one is a 'dd' copy of the other) and so they have identical volume names '/dev/magnia'. How do I change one? | ||
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Long answer: you have to have only one drive hooked up, boot from a rescue disk, and do it there. This sucks. | Long answer: you have to have only one drive hooked up, boot from a rescue disk, and do it there. This sucks. | ||
== How do I shrink everything to fit on a smaller hard drive? == | |||
Figure out what space you want to make the partition before you start. | |||
Preen: | |||
fsck /dev/magniatmp/root | |||
Remove journal, turning the filesystem from ext3 to ext2 | |||
tune2fs -O ^has_journal /dev/magniatmp/root | |||
Preen again: | |||
e2fsck -f /dev/magniatmp/root | |||
Resize the filesystem: | |||
resize2fs /dev/magniatmp/root 10000M | |||
Note the block count and size returned by resize command: 2560000 and 4k | |||
There is also a swap space on this volume group, I can remove it for now and recreate it later. lvremove /dev/magniatmp/swap_1 | |||
bc 2560000*4 | |||
10240000 | |||
lvresize -L 10240000 /dev/magniatmp/root | |||
Create new journal to convert back to ext3: | |||
tune2fs -j /dev/magniatmp/root | |||
Revision as of 03:37, 20 August 2010
Rename a volume group
I have two disks (one is a 'dd' copy of the other) and so they have identical volume names '/dev/magnia'. How do I change one?
Short answer: It is impossible. Using the UUID does not work!
Long answer: you have to have only one drive hooked up, boot from a rescue disk, and do it there. This sucks.
How do I shrink everything to fit on a smaller hard drive?
Figure out what space you want to make the partition before you start.
Preen: fsck /dev/magniatmp/root
Remove journal, turning the filesystem from ext3 to ext2 tune2fs -O ^has_journal /dev/magniatmp/root
Preen again: e2fsck -f /dev/magniatmp/root
Resize the filesystem: resize2fs /dev/magniatmp/root 10000M
Note the block count and size returned by resize command: 2560000 and 4k
There is also a swap space on this volume group, I can remove it for now and recreate it later. lvremove /dev/magniatmp/swap_1
bc 2560000*4 10240000 lvresize -L 10240000 /dev/magniatmp/root
Create new journal to convert back to ext3: tune2fs -j /dev/magniatmp/root
