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@ -22,20 +22,22 @@ and seems to handle fsyncs correctly. |
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on disk at a time, but anyway, a 512 MB or 1 GB partition will be more than enough. |
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For example you can shrink the main partition a bit and add the dm-era partition after it. |
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2. Zero out the new metadata partition: `dd if=/dev/zero of=<META_PARTITION> bs=1048576` |
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3. Copy `local-block_dm-era.sh` to `/etc/initramfs-tools/scripts/local-block` |
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3. Copy `zz_dm-era.sh` to `/etc/initramfs-tools/scripts/local-block` |
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and adjust `DATA_DEVICE`, `META_DEVICE` and `ERA_DEVICE_NAME` in it. |
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Use GPT and partition UUIDs to be safe because dm-era doesn't check |
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if you supply the correct partition to it. |
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4. Edit `/etc/fstab` and change your actual device to `/dev/mapper/<ERA_DEVICE_NAME>`, |
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Use partition IDs (`/dev/disk/by-partuuid/*` for GPT partitions, `/dev/disk/by-id/md-uuid-*` for mdadm, etc) |
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to be safe because dm-era doesn't check if you supply correct partitions to it. |
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4. Add `dm_era` to `/etc/initramfs-tools/modules`. |
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5. Edit `/etc/fstab` and change your actual device to `/dev/mapper/<ERA_DEVICE_NAME>`, |
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for example `/dev/mapper/root_era`. |
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5. Repeat it for more partitions if you want. |
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6. If you do it for the root partition also change `/etc/default/grub`: |
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6. Repeat it for more partitions if you want. |
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7. Run `update-initramfs -u -k all`. |
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8. If you do it for the root partition also change `/etc/default/grub`: |
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`GRUB_CMDLINE_LINUX="root=/dev/mapper/root_era"` and refresh grub config with `update-grub`. |
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7. Reboot. |
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8. Install dm-era tools (`era_invalidate`) with `apt-get install thin-provisioning-tools` on your target host. |
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9. Install `era_copy` and `era_apply` (`make install` from this repository) on both hosts (target host and backup host). |
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10. Do an initial full partition backup with block-level copy. |
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11. Now you can use `backup.sh` to perform incremental backups of the dm-era device |
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9. Reboot. |
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10. Install dm-era tools (`era_invalidate`) with `apt-get install thin-provisioning-tools` on your target host. |
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11. Install `era_copy` and `era_apply` (`make install` from this repository) on both hosts (target host and backup host). |
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12. Do an initial full partition backup with block-level copy. |
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13. Now you can use `backup.sh` to perform incremental backups of the dm-era device |
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over ssh from the backup host. Just change variables at the top of the script so it matches |
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your device configuration. |
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