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Vitaliy Filippov 2 years ago
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3bdfbb1bbe
  1. 24
      README.md
  2. 6
      zz_dm-era.sh

24
README.md

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

6
local-block_dm-era.sh → zz_dm-era.sh

@ -1,4 +1,5 @@
#!/bin/sh
# Put into /etc/initramfs-tools/scripts/local-block
set -e
@ -18,7 +19,8 @@ esac
modprobe dm-era
DATA_DEVICE=/dev/disk/by-partuuid/ca313f78-7911-994b-b465-5cda9a3ceafb
META_DEVICE=/dev/disk/by-partuuid/be47b5e2-1587-1243-9c5f-f9e165df5c30
DATA_DEVICE=`realpath /dev/disk/by-partuuid/ca313f78-7911-994b-b465-5cda9a3ceafb`
META_DEVICE=`realpath /dev/disk/by-partuuid/be47b5e2-1587-1243-9c5f-f9e165df5c30`
ERA_DEVICE_NAME=root_era
[ -z "$DATA_DEVICE" -o -z "$META_DEVICE" ] && exit 0
dmsetup create $ERA_DEVICE_NAME --table "0 `/sbin/blockdev --getsz $DATA_DEVICE` era $META_DEVICE $DATA_DEVICE 1024"
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