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-# How-To: Migration to Barnard
-
-All HPC users are cordially invited to migrate to our new HPC system **Barnard** and prepare your
-software and workflows for production there.
-
-!!! warning
-
- All data in the `/home` directory or in workspaces on the BeeGFS or Lustre SSD file
- systems will be deleted by the end of 2023, since these filesystems will be decommissioned.
-
-Existing Taurus users that would like to keep some of their data need to copy them to the new system
-manually, using the [steps described below](#data-management-and-data-transfer).
-
-For general hints regarding the migration please refer to these sites:
-
-* [Details on architecture](/jobs_and_resources/architecture_2023),
-* [Description of the migration](migration_2023.md).
-
-We value your feedback. Please provide it directly via our ticket system. For better processing,
-please add "Barnard:" as a prefix to the subject of the [support ticket](../support/support).
-
-## Login to Barnard
-
-!!! hint
-
- All users and projects from Taurus now can work on Barnard.
-
-You use `login[1-4].barnard.hpc.tu-dresden.de` to access the system
-from campus (or VPN). In order to verify the SSH fingerprints of the login nodes, please refer to
-the page [Fingerprints](/access/key_fingerprints/#barnard).
-
-All users have **new empty HOME** file systems, this means you have first to ...
-
-??? "... install your public SSH key on Barnard"
-
- - Please create a new SSH keypair with ed25519 encryption, secured with
- a passphrase. Please refer to this
- [page for instructions](../../access/ssh_login#before-your-first-connection).
- - After login, add the public key to your `.ssh/authorized_keys` file on Barnard.
-
-## Data Management and Data Transfer
-
-### Filesystems on Barnard
-
-Our new HPC system Barnard also comes with **two new Lustre filesystems**, namely `/data/horse` and
-`/data/walrus`. Both have a capacity of 20 PB, but differ in performance and intended usage, see
-below. In order to support the data life cycle management, the well-known
-[workspace concept](#workspaces-on-barnard) is applied.
-
-* The `/project` filesystem is the same on Taurus and Barnard
-(mounted read-only on the compute nodes).
-* The new work filesystem is `/data/horse`.
-* The slower `/data/walrus` can be considered as a substitute for the old
- `/warm_archive`- mounted **read-only** on the compute nodes.
- It can be used to store e.g. results.
-
-!!! Warning
-
- All old filesystems, i.e., `ssd`, `beegfs`, and `scratch`, will be shutdown by the end of 2023.
- To work with your data from Taurus you might have to move/copy them to the new storages.
-
- Please, carefully read the following documentation and instructions.
-
-### Workspaces on Barnard
-
-The filesystems `/data/horse` and `/data/walrus` can only be accessed via workspaces. Please refer
-to the [workspace page](../../data_lifecycle/workspaces/), if you are not familiar with the
-workspace concept and the corresponding commands. The following table provides the settings for
-workspaces on these two filesystems.
-
-| Filesystem (use with parameter `--filesystem=<filesystem>`) | Max. Duration in Days | Extensions | Keeptime in Days |
-|:-------------------------------------|---------------:|-----------:|--------:|
-| `/data/horse` (default) | 100 | 10 | 30 |
-| `/data/walrus` | 365 | 2 | 60 |
-{: summary="Settings for Workspace Filesystem `/data/horse` and `/data/walrus`."}
-
-### Data Migration to New Filesystems
-
-Since all old filesystems of Taurus will be shutdown by the end of 2023, your data needs to be
-migrated to the new filesystems on Barnard. This migration comprises
-
-* your personal `/home` directory,
-* your workspaces on `/ssd`, `/beegfs` and `/scratch`.
-
-!!! note "It's your turn"
-
- **You are responsible for the migration of your data**. With the shutdown of the old
- filesystems, all data will be deleted.
-
-!!! note "Make a plan"
-
- We highly recommand to **take some minutes for planing the transfer process**. Do not act with
- precipitation.
-
- Please **do not copy your entire data** from the old to the new filesystems, but consider this
- opportunity for **cleaning up your data**. E.g., it might make sense to delete outdated scripts,
- old log files, etc., and move other files, e.g., results, to the `/data/walrus` filesystem.
-
-!!! hint "Generic login"
-
- In the following we will use the generic login `marie` and workspace `numbercrunch`
- ([cf. content rules on generic names](../contrib/content_rules.md#data-privacy-and-generic-names)).
- **Please make sure to replace it with your personal login.**
-
-We have four new [datamover nodes](/data_transfer/datamover) that have mounted all storages
-of the old Taurus and new Barnard system. Do not use the datamovers from Taurus, i.e., all data
-transfer need to be invoked from Barnard! Thus, the very first step is to
-[login to Barnard](#login-to-barnard).
-
-The command `dtinfo` will provide you the mountpoints of the old filesystems
-
-```console
-marie@barnard$ dtinfo
-[...]
-directory on datamover mounting clusters directory on cluster
-
-/data/old/home Taurus /home
-/data/old/lustre/scratch2 Taurus /scratch
-/data/old/lustre/ssd Taurus /lustre/ssd
-[...]
-```
-
-In the following, we will provide instructions with comprehensive examples for the data transfer of
-your data to the new `/home` filesystem, as well as the working filesystems `/data/horse` and
-`/data/walrus`.
-
-??? "Migration of Your Home Directory"
-
- Your personal (old) home directory at Taurus will not be automatically transferred to the new
- Barnard system. Please do not copy your entire home, but clean up your data. E.g., it might
- make sense to delete outdated scripts, old log files, etc., and move other files to an archive
- filesystem. Thus, please transfer only selected directories and files that you need on the new
- system.
-
- The steps are as follows:
-
- 1. Login to Barnard, i.e.,
-
- ```
- ssh login[1-4].barnard.tu-dresden.de
- ```
-
- 1. The command `dtinfo` will provide you the mountpoint
-
- ```console
- marie@barnard$ dtinfo
- [...]
- directory on datamover mounting clusters directory on cluster
-
- /data/old/home Taurus /home
- [...]
- ```
-
- 1. Use the `dtls` command to list your files on the old home directory
-
- ```
- marie@barnard$ dtls /data/old/home/marie
- [...]
- ```
-
- 1. Use the `dtcp` command to invoke a transfer job, e.g.,
-
- ```console
- marie@barnard$ dtcp --recursive /data/old/home/marie/<useful data> /home/marie/
- ```
-
- **Note**, please adopt the source and target paths to your needs. All available options can be
- queried via `dtinfo --help`.
-
- !!! warning
-
- Please be aware that there is **no synchronisation process** between your home directories
- at Taurus and Barnard. Thus, after the very first transfer, they will become divergent.
-
-Please follow this instructions for transferring you data from `ssd`, `beegfs` and `scratch` to the
-new filesystems. The instructions and examples are divided by the target not the source filesystem.
-
-This migration task requires a preliminary step: You need to allocate workspaces on the
-target filesystems.
-
-??? Note "Preliminary Step: Allocate a workspace"
-
- Both `/data/horse/` and `/data/walrus` can only be used with
- [workspaces](../data_lifecycle/workspaces.md). Before you invoke any data transer from the old
- working filesystems to the new ones, you need to allocate a workspace first.
-
- The command `ws_list -l` lists the available and the default filesystem for workspaces.
-
- ```
- marie@barnard$ ws_list --list
- available filesystems:
- horse (default)
- walrus
- ```
-
- As you can see, `/data/horse` is the default workspace filesystem at Barnard. I.e., if you
- want to allocate, extend or release a workspace on `/data/walrus`, you need to pass the
- option `--filesystem=walrus` explicitly to the corresponding workspace commands. Please
- refer to our [workspace documentation](../data_lifecycle/workspaces.md), if you need refresh
- your knowledge.
-
- The most simple command to allocate a workspace is as follows
-
- ```
- marie@barnard$ ws_allocate numbercrunch 90
- ```
-
- Please refer to the table holding the settings
- (cf. [subection workspaces on Barnard](#workspaces-on-barnard)) for the max. duration and
- `ws_allocate --help` for all available options.
-
-??? "Migration to work filesystem `/data/horse`"
-
- === "Source: old `/scratch`"
-
- If you transfer data from the old `/scratch` to `/data/horse`, it is sufficient to use
- `dtmv` instead of `dtcp` since this data has already been copied to a special directory on
- the new `horse` filesystem. Thus, you just need to move it to the right place (the Lustre
- metadata system will update the correspoding entries).
-
- ```console
- marie@barnard$ dtmv /data/horse/lustre/scratch2/0/marie-numbercrunch /data/horse/ws/marie-numbercrunch
- ```
-
- === "Source: old `/ssd`"
-
- The old `ssd` filesystem is mounted at `/data/old/lustre/ssd` on the datamover nodes and the
- workspaces are within the subdirectory `ws/`. A corresponding data transfer using `dtcopy`
- looks like
-
- ```console
- marie@barnard$ dtcp --recursive /data/old/lustre/ssd/ws/marie-numbercrunch /data/horse/ws/marie-numbercrunch
- ```
-
- === "Source: old `/beegfs`"
-
- The old `beegfs` filesystem is mounted at `/data/old/beegfs` on the datamover nodes and the
- workspaces are within the subdirectories `ws/0` and `ws/1`, respectively. A corresponding
- data transfer using `dtcp` looks like
-
- ```console
- marie@barnard$ dtcp --recursive /data/old/beegfs/ws/0/marie-numbercrunch /data/horse/ws/marie-numbercrunch
- ```
-
-??? "Migration to `/data/walrus`"
-
- === "Source: old `/scratch`"
-
- The old `scratch` filesystem is mounted at `/data/old/lustre/scratch2` on the datamover
- nodes and the workspaces are within the subdirectories `ws/0` and `ws/1`, respectively. A
- corresponding data transfer using `dtcopy` looks like
-
- ```console
- marie@barnard$ dtcp --recursive /data/old/lustre/scratch2/ws/0/marie-numbercrunch /data/walrus/ws/marie-numbercrunch
- ```
-
- === "Source: old `/ssd`"
-
- The old `ssd` filesystem is mounted at `/data/old/lustre/ssd` on the datamover nodes and the
- workspaces are within the subdirectory `ws/`. A corresponding data transfer using `dtcopy`
- looks like
-
- ```console
- marie@barnard$ dtcp --recursive /data/old/lustre/ssd/ /data/walrus/ws/marie-numbercrunch
- ```
-
- === "Source: old `/beegfs`"
-
- The old `beegfs` filesystem is mounted at `/data/old/beegfs` on the datamover nodes and the
- workspaces are within the subdirectories `ws/0` and `ws/1`, respectively. A corresponding
- data transfer using `dtcopy` looks like
-
- ```console
- marie@barnard$ dtcp --recursive /data/old/beegfs/ws/0/marie-numbercrunch /data/walrus/ws/marie-numbercrunch
- ```
-
-??? "Migration from `/lustre/ssd` or `/beegfs`"
-
- **You** are entirely responsible for the transfer of these data to the new location.
- Start the dtrsync process as soon as possible. (And maybe repeat it at a later time.)
-
-??? "Migration from `/lustre/scratch2` aka `/scratch`"
-
- We are synchronizing this (**last: October 18**) to `/data/horse/lustre/scratch2/`.
-
- Please do **NOT** copy those data yourself. Instead check if it is already sychronized
- to `/data/walrus/warm_archive/ws`.
-
- In case you need to update this (Gigabytes, not Terabytes!) please run `dtrsync` like in
- `dtrsync -a /data/old/lustre/scratch2/ws/0/my-workspace/newest/ /data/horse/lustre/scratch2/ws/0/my-workspace/newest/`
-
-??? "Migration from `/warm_archive`"
-
- The process of syncing data from `/warm_archive` to `/data/walrus/warm_archive` is still ongoing.
-
- Please do **NOT** copy those data yourself. Instead check if it is already sychronized
- to `/data/walrus/warm_archive/ws`.
-
- In case you need to update this (Gigabytes, not Terabytes!) please run `dtrsync` like in
- `dtrsync -a /data/old/warm_archive/ws/my-workspace/newest/ /data/walrus/warm_archive/ws/my-workspace/newest/`
-
-When the last compute system will have been migrated the old file systems will be
-set write-protected and we start a final synchronization (sratch+walrus).
-The target directories for synchronization `/data/horse/lustre/scratch2/ws` and
-`/data/walrus/warm_archive/ws/` will not be deleted automatically in the mean time.
-
-## Software
-
-Please use `module spider` to identify the software modules you need to load.
-
-The default release version is 23.10.
-
-## Slurm
-
-* We are running the most recent Slurm version.
-* You must not use the old partition names.
-* Not all things are tested.
-
-## Updates after your feedback (state: October 19)
-
-* A **second synchronization** from `/scratch` has started on **October, 18**, and is
- now nearly done.
-* A first, and incomplete synchronization from `/warm_archive` has been done (see above).
- With support from NEC we are transferring the rest in the next weeks.
-* The **data transfer tools** now work fine.
-* After fixing too tight security restrictions, **all users can login** now.
-* **ANSYS** now starts: please check if your specific use case works.
-* **login1** is under construction, do not use it at the moment. Workspace creation does
- not work there.