# Urblauna
### Kesako?
Urblauna (Romanche), or Lagopède Alpin in French, is a bird known for its changing plumage which functions as a very effective camouflage. More information is available at [https://www.vogelwarte.ch/fr/oiseaux/les-oiseaux-de-suisse/lagopede-alpin](https://www.vogelwarte.ch/fr/oiseaux/les-oiseaux-de-suisse/lagopede-alpin)
It's also the name of our new sensitive data compute cluster which will replace the Jura cluster.
Information on how to connect to Urblauna can be [found here](https://wiki.unil.ch/ci/books/high-performance-computing-hpc/page/urblauna-access-and-data-transfer).
Information on the Jura to Urblauna migration can be [found here](https://wiki.unil.ch/ci/books/high-performance-computing-hpc/page/jura-to-urblauna-migration)
The differences between Jura and Urblauna are [described here](https://wiki.unil.ch/ci/books/high-performance-computing-hpc/page/urblauna-migration)
### Hardware
#### Compute
The cluster is composed of 18 compute nodes of which two have GPUs. All have the same 24 core processor.
Number of nodes | Memory | CPU | GPU |
16 | 1024 GB | 2 x AMD Epyc3 7443 | - |
2 | 1024 GB | 2 x AMD Epyc3 7443 | 2 x NVIDIA A100 |
The GPUs are partitioned to create 4 GPUs on each machine with 20GB of memory per GPU
#### Storage
The storage is based on IBM Spectrum Scale / Lenovo DSS and provides 1PB of space in the /data filesystem.
Whilst reliable this space is not backed up and all important data should also be stored on /archive
The Curnagl /work filesystem is visible in read-only mode on Urblauna and can be used to install software on an internet connected system before using it on Urblauna.
**Filesystem mount point**
| **Description**
|
/users | Urblauna home directory |
/scratch | Urblauna scratch space (automatic cleanup) |
/data | Urblauna data space (no backup) |
/archive | Secure data space with backup (login node access only) |
/work | Curnagl data space (read only) |
/jura_home | Jura home directories (read only, login node only) |
/jura_data | Jura data space (read only, login node only) |
### Software
For information on the DCSR software stack see the following link:
[https://wiki.unil.ch/ci/books/high-performance-computing-hpc/page/dcsr-software-stack](https://wiki.unil.ch/ci/books/high-performance-computing-hpc/page/dcsr-software-stack)
### Slurm partitions
On Urblauna there are two partitions - "urblauna" and "interactive"
```
$ sinfo
PARTITION AVAIL TIMELIMIT NODES STATE NODELIST
urblauna* up 3-00:00:00 17 idle sna[002-016],snagpu[001-002]
interactive up 8:00:00 4 idle sna[015-016],snagpu[001-002]
```
There is no separate GPU partition so to use a GPU simply request
\#SBATCH --gres=gpu:1
To launch an interactive session you can use `Sinteractive` as on Curnagl