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doc/migrating-storage-device: show how to resize the fs

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Colin
2025-08-22 02:57:08 +00:00
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commit 8b333a8887
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doc/migrating-storage-device.md
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@@ -1,18 +1,18 @@
## migrating a host to a new drive ## migrating a host to a new drive
1. copy persistent data off of the host: ### 1. copy persistent data off of the host:
```sh ```sh
$ mkdir -p mnt old/persist $ mkdir -p mnt old/persist
$ mount /dev/$old mnt $ mount /dev/$old mnt
$ rsync -arv mnt/persist/ old/persist/ $ rsync -arv mnt/persist/ old/persist/
``` ```
2. flash the new drive ### 2. flash the new drive
``` ```
$ nix-build -A hosts.moby.img $ nix-build -A hosts.moby.img
$ dd if=$(readlink ./result) of=/dev/$new bs=4M oflag=direct conv=sync status=progress $ dd if=$(readlink ./result) of=/dev/$new bs=4M oflag=direct conv=sync status=progress
``` ```
3. expand the partition and filesystem ### 3.1. expand the partition
```sh ```sh
$ cfdisk /dev/$new $ cfdisk /dev/$new
# scroll to the last partition # scroll to the last partition
@@ -21,24 +21,29 @@ $ cfdisk /dev/$new
> Write > Write
type "yes" type "yes"
> Quit > Quit
$ btrfs filesystem resize max /dev/$new ```
### 3.2. expand the filesystem
```
$ mkdir -p /mnt/$new
$ mount /dev/$new /mnt/$new
$ btrfs filesystem resize max /mnt/$new
``` ```
4. copy data onto the new host ### 4. copy data onto the new host
``` ```
$ mkdir new $ mkdir /mnt/$new
$ mount /dev/$new new $ mount /dev/$new /mnt/$new
# if you want to use btrfs snapshots (e.g. snapper), then create the data directory as a subvolume: # if you want to use btrfs snapshots (e.g. snapper), then create the data directory as a subvolume:
$ sudo btrfs subvolume create new/persist $ btrfs subvolume create /mnt/$new/persist
# restore the data # restore the data
$ rsync -arv old/persist/ new/persist/ $ rsync -arv old/persist/ /mnt/$new/persist/
``` ```
5. ensure/fix ownership ### 5. ensure/fix ownership
``` ```
$ chmod -R a+rX new/nix $ chmod -R a+rX /mnt/$new/nix
# or, let the nix daemon do it: # or, let the nix daemon do it:
$ nix copy --no-check-sigs --to new $(nix-build -A hosts.moby) $ nix copy --no-check-sigs --to /mnt/$new $(nix-build -A hosts.moby)
``` ```
```
6. insert the disk into the system, and boot! ### 6. insert the disk into the system, and boot!