The login nodes can be accessed via
ssh albedo0.awi.de and ssh albedo1.awi.de
If you do not familiar with ssh and/or bash you should start here https://spaces.awi.de/x/-q1-Fw for a basic introduction.
Please do not use these nodes for computing, please use the compute nodes (see section Computenodes&Slurm below)
HPC resources are not available from remote for security reasons (VPN is possible, https://spaces.awi.de/x/Smr-Eg).
By using albedo you accept our HPC data policy https://spaces.awi.de/x/GgrXFw

Support

You can open a support ticket on helpdesk.awi.de or by writing an email to hpc@awi.de. Please do not send a personal email to an admin!

Storage

The local storage is a GxFS Storage Appliance from NEC based on https://en.wikipedia.org/wiki/GPFS.
All nodes are connected via a 100 Gb OPA/Mellanox/Inifiniband network.

	Personal directories			Project directories
Mountpoint	/albedo/home/$USER	/albedo/work/user/$USER	/albedo/scratch/user/$USER	/albedo/work/projects/$PROJECT	/albedo/scratch/projects/$PROJECT	/albedo/burst
Quota (soft)	100 GB	3TB	50 TB	variable 30 €/TB/yr	variable 10 €/TB/yr	--
Quota (hard)	100 GB	15 TB for 90 days	--	2x soft quota for 90 days	--
Delete	90 days after user account expired		all data after 90 days	90 days after project expired	all data after 90 days	after 10 days
Security	Snapshots for 6 months		--	Snapshots for 6 months	--	--
Owner	$USER:hpc_user			$OWNER:$PROJECT		root:root
Permission	2700 → drwx--S---			2770 → rwxrws---		1777 → rwxwrxrwt
Focus	many small files	large files, large bandwidth				low latency, huge bandwidth

Is installed and maintained in /albedo/home/soft/:

If you need space here, please contact hpc@awi.de

You can access your online space on the Isilon in Bremerhaven (see https://spaces.awi.de/x/a13-Eg for more information) via the mountpoints
/isibhv/projects
/isibhv/projects-noreplica
/isibhv/netscratch
/isibhv/platforms
/isibhv/home
albedo is connected with the AWI backbone (including the Isilon) via four 100 Gb interfaces.
Each single albedo node has a 10 Gb interface.

To work interactively on a compute node use salloc. You can use all options (more CPU, RAM, time, partition, qos, ...) described below.
To submit a job from the login nodes to the compute nodes you need slurm (job scheduler, batch queueing system and workload manager)

A submitted job has/needs the following information/resources:

What	Use	Default	Comment
Name	-J or --job-name=
Account	-A or --account=	--	New on albedo (was not necessary on ollie)
Number of nodes	-N or --nodes=	1
Number of (MPI-)tasks (per node)	-n or --ntasks= --ntasks-per-node=	1	Needed for MPI
Number of cores/threads per task	-c or --cpus-per-task=	1	Needed for OpenMP If -n N and -c C is given, you get N x C cores.
Memory/RAM per CPU	--mem=	ntasks x nthreads x 1.6 GB	Only needed for smp-jobs, mpp-jobs get whole nodes (cores and memory)
Maximum walltime	-t or --time=	01:00
Partition	-p or --partition=	smp
qos (quality of service)	-q or --qos=	normal

Partition	Nodes	Purpose
smp	240	For OpenMP or serial jobs with up to 36 (OpenMP) cores. Jobs may share nodes (until all cores are occupied).
mpp	240	For MPI-parallel jobs, typically >=36 cores. Jobs get nodes exclusively
fat	4	For OpenMP or serial jobs that need >256 GiB RAM
gpu	1	For jobs that can take advantage from a Nvidia A100/80

QOS	max. time	max nodes job/user/total	Fairshare usage factor	Comment
short	00:30:00	128 / 312 / 312	1	High priority, jobs in this qos run first
normal	12:00:00	128 / 312 / 312	1	Default
large	96:00:00	8 / 16 / 64	2
xlarge	400:00:00	1 / 2 / 8	10	Only on request. Use at own risk, consider short jobs with restarts if possible
knurd	-	-	1	For admins only