Revert "Add incremental RST-to-MyST swap mechanism (#1857)" (#1892)

This reverts commit 4b36114e053ee11d0cb264a1e4cfe4692d78f194.

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----
-lastproofread: '2025-11-20'
----
-
-(raid)=
-
-# RAID 1
-
-A Redundant Array of Independent Disks (RAID) uses two or more hard disk drives
-to improve disk speed, store more data, and/or provide fault tolerance.
-There are several storage schemes possible in a RAID array, each offering a
-different combination of storage, reliability, and performance.
-VyOS supports **RAID 1** deployments. RAID 1 uses two or more
-disks that mirror one another to provide system fault tolerance. In a RAID 1
-configuration, every sector on one disk is duplicated on every sector of all
-disks in the array. Provided even one disk in the RAID 1 set is operational,
-the system continues to run, even through disk replacement (provided that the
-hardware supports in-service replacement of drives).
-RAID 1 can be implemented using special hardware or it can be implemented in
-software. VyOS supports software RAID 1 on two disks.
-The VyOS implementation of RAID 1 features the following:
-
-- Detection and reporting of disk failure.
-- Maintain system operation with one failed disk.
-- Boot the system with one failed disk.
-- Replace a failed disk and initiate re-mirroring.
-- Monitor the status of re-mirroring.
-
-(raid-installation)=
-
-## Installation implications
-
-The VyOS installation utility provides several options for installing
-to a RAID 1 set. You can:
-
-- Use the install system to create the RAID 1 set.
-- Use the built-in Linux commands to create a RAID 1 set before running the
-  install system command.
-- Use a previously-created RAID 1 set.
-
-:::{note}
-Before a permanent installation, VyOS runs a live installation.
-:::
-
-## Configuration
-
-### Standard installation on a single disk
-
-VyOS automatically detects the presence of two or more
-disks that are not currently part of a RAID array when installed. The VyOS
-installation utility automatically offers you the option to configure RAID 1
-mirroring for eligible drives with the following prompt:
-
-```none
-Would you like to configure RAID 1 mirroring on them?
-```
-
-- If you do not want to configure RAID 1 mirroring, enter **No** at the prompt.
-
-### Empty 2+ disk
-
-If VyOS detects two identical disks that are not currently part of a
-RAID 1 set, the VyOS installation utility automatically offers the option
-to configure RAID 1 mirroring for the drives with the following prompt:
-
-```none
-Would you like to configure RAID 1 mirroring on them?
-```
-
-1\. To create a new RAID 1 array, enter **Yes** at the prompt. If VyOS
-detects a filesystem on the partitions being used for RAID 1, it will prompt you
-to indicate whether you want to continue creating the RAID 1 array.
-
-```none
-Continue creating array?
-```
-
-2. To overwrite the old filesystem, enter **Yes**.
-
-3\. The system informs you that all data on both drives will be erased.
-Confirm you want to continue.
-
-```none
-Are you sure you want to do this?
-```
-
-4\. Enter **Yes** at the prompt to retain the current VyOS configuration.
-Enter **No** to delete the current VyOS configuration.
-
-```none
-Would you like me to save the data on it before I delete it?
-```
-
-5\. Enter **Yes** at the prompt to retain the current VyOS configuration.
-Enter **No** to delete the current VyOS configuration.
-
-6. Continue installing VyOS.
-
-### Preexisting RAID 1 configuration
-
-When VyOS detects a previously configured RAID 1 set,
-the installation utility displays the following prompt:
-
-```none
-Would you like to use this one? 
-```
-
-1\. To break up the current RAID 1 set, enter **No** at the prompt. The
-installation utility detects that there are two identical disks and offers you
-the option of configuring RAID 1 mirroring with the following
-prompt:
-
-```none
-Would you like to configure RAID 1 mirroring on them?
-```
-
-2\. To decline to set up a new RAID 1 configuration on the disks, enter **No**
-at the prompt. VyOS prompts you to indicate which partition you would
-like the system installed on.
-
-```none
-Which partition should I install the root on? [sda1]: 
-```
-
-3\. Enter the partition where you would like the system installed. The system
-then prompts you to indicate whether you want to save the old configuration
-data. This represents the current VyOS configuration.
-
-```none
-Would you like me to save the data on it before I delete it?
-```
-
-4\. Enter **Yes** at the prompt to retain the current VyOS configuration once
-installation is complete. Enter **No** to delete the current VyOS configuration.
-
-5. Continue installing VyOS.
-
-### Detecting and replacing a failed RAID 1 disk
-
-VyOS system detects disk failures within a RAID 1 set and
-reports them to the system console. You can verify the failure by running the
-`show raid` command.
-
-To replace a bad disk within a RAID 1 set:
-
-1. Remove the failed disk from the RAID 1 set:
-
-   ```{opcmd} delete raid \<RAID‐1‐device\> member \<disk‐partition\>
-   ```
-   where `RAID-1-device` is the name of the RAID 1 device. For example,
-   `md0` and
-   `disk-partition` is the name of the failed disk partition. For example,
-   `sdb2`.
-2. Physically remove the failed disk from the system. If the drives are not
-   hot-swappable, then you must shut down the system before removing the disk.
-3. Replace the failed drive with a drive of the same size or larger.
-4. Format the new disk for RAID 1 by running the following command:
-
-   ```{opcmd} format disk \<disk‐device1\> like \<disk‐device2\>
-   ```
-   where `disk-device1` is the replacement disk. For example, `sdb` and
-   `disk-device2` is the existing healthy disk. For example, `sda`.
-
-5. Add the replacement disk to the RAID 1 set by running the following command:
-
-   ```{opcmd} add raid \<RAID‐1‐device\> member \<disk‐partition\>
-   ```
-   where `RAID-1-device` is the name of the RAID 1 device. For example,
-   `md0` and `disk-partition` is the name of the replacement disk partition.
-   For example, `sdb2`.
-
-## Operation
-
-Learn how to add a disk partition to a RAID 1 set, initiate
-mirror synchronization, and check and display information.
-
-```{opcmd} add raid \<RAID‐1‐device\> member \<disk‐partition\>
-
-   Use this command to add a member disk partition to the RAID 1 set. Adding a
-   disk partition to a RAID 1 set initiates mirror synchronization, where all
-   data on the existing member partition is copied to the new partition.
-
-```
-
-```{opcmd} format disk \<disk‐device1\> like \<disk‐device2\>
-
-This command is typically used to prepare a disk to be added to a preexisting
-RAID 1 set (of which ``disk-device2`` is already a member).
-```
-
-```{opcmd} show raid \<RAID‐1‐device\>
-
-shows output for ``show raid md0`` as ``sdb1`` is being added to the RAID 1
-set and is in the process of being resynchronized.
-
-:::{code-block} none
-vyos@vyos:~$ show raid md0
-/dev/md0:
-      Version : 00.90
-Creation Time : Wed Oct 29 09:19:09 2008
-   Raid Level : raid1
-   Array Size : 1044800 (1020.48 MiB 1069.88 MB)
-Used Dev Size : 1044800 (1020.48 MiB 1069.88 MB)
- Raid Devices : 2
-Total Devices : 2
-Preferred Minor : 0
-Persistence : Superblock is persistent
-Update Time : Wed Oct 29 19:34:23 2008
-        State : active, degraded, recovering
-Active Devices : 1
-Working Devices : 2
-Failed Devices : 0
-Spare Devices : 1
-Rebuild Status : 17% complete
-         UUID : 981abd77:9f8c8dd8:fdbf4de4:3436c70f
-       Events : 0.103
-Number   Major   Minor   RaidDevice State
-     0       8        1        0      active sync   /dev/sda1
-     2       8       17        1      spare rebuilding   /dev/sdb1
-:::
-```
-
-```{opcmd} show disk sda format
-
-Use this command to display the formatting of a hard disk.
-
-:::{code-block} none
-vyos@vyos:~$ show disk sda format
-Disk /dev/sda: 1073 MB, 1073741824 bytes
-85 heads, 9 sectors/track, 2741 cylinders
-Units = cylinders of 765 * 512 = 391680 bytes
-Disk identifier: 0x000b7179
-Device Boot      Start         End      Blocks   Id  System
-/dev/sda1               6        2737     1044922+  fd  Linux raid autodetect
-:::
-```
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