The ARC cluster: Difference between revisions

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Once you have obtained an '''ARC''' account at '''IRA''', you can access the computer cluster nodes from everywhere through host  '''scheduler.ira.inaf.it.'''.
Once you have obtained an '''ARC''' account at '''IRA''', you can access the computer cluster nodes from everywhere through host  '''scheduler.ira.inaf.it.'''.
Using graphical applications on the cluster is possible through  remote X access.
Using graphical applications on the cluster is possible through  remote X access.
The accessible working nodes are listed in the table below. Never submit workloads to arcserv (control node) and arcnas1 (storage) as this can slow down the entire cluster.
The accessible working nodes are listed in the table below.
You can  enter a node for interactive work by typing:
You can  enter a node for interactive work by typing:


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Beware that local disks have '''no redundancy at all''', never leave important data on them
Beware that local disks have '''no redundancy at all''', never leave important data on them
=== Copying files to/from the ARC storage ===
==== via SCP ====
<source lang="bash">
# while running on a computer computer outside IRA
# trasferring from storage to your computer
scp user@alma-wan.ira.inaf.it:/remote/path /local/path
# from your computer to storage
scp /local/path user@alma-wan.ira.inaf.it:/remote/path
# while running on a computer computer inside IRA
# trasferring from storage to your computer
scp user@arcbl02.ira.inaf.it:/remote/path /local/path
# from your computer to storage
scp /local/path user@arcbl02.ira.inaf.it:/remote/path
</source>
==== via HTTP ====
you can also download from your homesarc:
for example a file in /iranet/homesarc/your_username/public_html/file.dat
will be downloadable from http://alma-wan.ira.inaf.it/~your_username/file.dat
or you can make a symbolic link:
<source lang="bash">
cd /iranet/homesarc/your_username/public_html/
ln -s ../otherfile.dat
</source>


=== Mounting ARC storage on you workstation ===
=== Mounting ARC storage on you workstation ===
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== Software packages available ==
== Software packages available ==


Software available on ARC cluster could be listed typing the command ''setup-help''
Software available on ARC cluster could be listed typing the command ''setup-help'' or on [https://www.ira.inaf.it/wiki/index.php/Arcsoft this page]


== Nodes ==
== Computing Nodes ==
{| class="wikitable"
{| class="wikitable"
|-
|-
! Name !! RAM !! CPU !! Cores !!  Clock !! Data Net !! Work Disk !! Scratch Disk !! scheduler !! groups !! notes
! Name !! RAM !! CPU !! Cores !!  Clock !! Data Net !! Work Disk !! Scratch Disk !! scheduler !! groups !! notes
|-
|arcbl01||32G||Intel Xeon E5-2637 v3||2 x 4/8||3500||10GbE||1TB||1TB||N||*||
|-
|arcbl02||8G||AMD Opteron 2352||8||2100||10GbE||34G|| ||Y||*||reserved for file transfer
|-
|arcbl03||8G||AMD Opteron 2352||8||2100||10GbE||34G|| ||Y||*||reserved for nfs export
|-
|arcbl04||8G||AMD Opteron 2352||8||2100||10GbE||34G|| ||Y||*||
|-
|arcbl05||8G||AMD Opteron 2352||8||2100||10GbE||1T|| ||Y||*||
|-
|arcbl06||8G||AMD Opteron 2352||8||2100||10GbE||34G|| ||Y||*||
|-
|arcbl07||8G||AMD Opteron 2352||8||2100||10GbE||34G|| ||Y||*||
|-
|arcbl08||8G||AMD Opteron 2352||8||2100||10GbE||34G|| ||Y||*||disabled
|-
|arcbl09||8G||AMD Opteron 2352||8||2100||10GbE||34G|| ||Y||*||disabled
|-
|arcbl10||32G||Intel Xeon E5-2637 v3||2 x 4/8||3500||10GbE||1T||1T||N||arc-staff, arc-vlbi||
|-
|arcbl11||8G||AMD Opteron 2352||8||2100||10GbE||34G|| ||N||arc-staff, arc-vlbi||
|-
|arcbl12||16G||AMD Opteron 2352||8||2100||10GbE||34G|| ||N||arc-staff, arc-vlbi, arc-f2f||
|-
|arcbl13||16G||AMD Opteron 2387||4||2800||10GbE||136G|| ||N||arc-staff, arc-vlbi, arc-f2f||
|-
|-
|arcbl17||64G||AMD Ryzen 7 1800X||8/16||3600||1GbE||3,5TB|| ||N||arc-staff, arc-vlbi||
|arcbl17||64G||AMD Ryzen 7 1800X||8/16||3600||1GbE||3,5TB|| ||N||arc-staff, arc-vlbi||
|-
|-
|arcbl18||64G||Intel Xeon E3-1275 v6||4/8||3800||10GbE||22T||57G||N||arc-staff, arc-vlbi||
|arcbl18||64G||Intel Xeon E3-1275 v6||4/8||3800||10GbE||22T||57G||N||arc-staff, arc-vlbi||Data transfer node
|-
|-
|arcbl19||64G||Intel Xeon E3-1275 v6||4/8||3800||10GbE||11T||57G||N||arc-staff, arc-vlbi, arc-f2f||
|arcbl19||64G||Intel Xeon E3-1275 v6||4/8||3800||10GbE||11T||57G||N||arc-staff, arc-vlbi, arc-f2f, arc-user||NFS server
|-
|-
|arcbl20||256G||Intel Xeon E5-1650 v4||6/12||3600||10GbE||11T||65G||N||arc-staff, arc-vlbi, arc-f2f||
|arcbl20||256G||Intel Xeon E5-1650 v4||6/12||3600||10GbE||11T||65G||N||arc-staff, arc-vlbi||
|-
|-
|arcbl21||64G||Intel Xeon E3-1275 v6||4/8||3800||10GbE||11T||57G||N||arc-staff, arc-vlbi, arc-f2f||
|arcbl21||64G||Intel Xeon E3-1275 v6||4/8||3800||10GbE||11T||57G||N||arc-staff, arc-vlbi||
|-
|-
|arcbl22||256G||Intel Xeon E5-1650 v4||6/12||3600||10GbE||11T||65G||N||arc-staff, arc-vlbi||
|arcbl22||256G||Intel Xeon E5-1650 v4||6/12||3600||10GbE||11T||65G||N||arc-staff, arc-vlbi, arc-f2f||
|-
|-
|arcbl23||256G||Intel Xeon E5-1650 v4||6/12||3600||10GbE||11T||65G||N||arc-staff, arc-vlbi||
|arcbl23||256G||Intel Xeon E5-1650 v4||6/12||3600||10GbE||11T||65G||N||arc-staff, arc-vlbi||VM
|-
|-
|arcbl24||256G||Intel Xeon E5-1650 v4||6/12||3600||10GbE||11T||65G||N||arc-staff, arc-vlbi||
|arcbl24||256G||Intel Xeon E5-1650 v4||6/12||3600||10GbE||11T||65G||N||arc-staff, arc-vlbi||
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|-
|-
|arcbl29||256G||Intel Xeon E5-1650 v4||4/8||3600||10GbE||15T||57G||N||arc-staff, arc-vlbi||
|arcbl29||256G||Intel Xeon E5-1650 v4||4/8||3600||10GbE||15T||57G||N||arc-staff, arc-vlbi||
|}
== Storage Nodes ==
{| class="wikitable"
|-
! Name !! RAM !! CPU !! Cores !!  Clock !! Data Net !! RAID !! Space !! Storage !! export
|-
|arcnas2||32G||Intel Xeon Silver 4108||8/16||1800||10GbE||ARC-1883IX-24||91||12x10TB (HGST HUH721010ALE600) RAID6||/lustre/arcfs0/ost3
|-
|arcnas3||32G||Intel Xeon Silver 4108||8/16||1800||10GbE||ARC-1883IX-24||72,8||12x8TB (HGST HUH728080AL5200) RAID6 ||/lustre/arcfs0/ost0
|-
|arcnas4||16G||Intel XeonE5-2603v3||6/6||1600||10GbE||ARC-1284ML-24||36,4T||12x4TB (WDC WD4000F9YZ-09N20L1) RAID6||/lustre/arcfs0/ost1
|-
| || || || || || || ||91T||12x10TB (ST10000NM0086-2AA101) RAID6||/lustre/arcfs0/ost2
|}
|}

Revision as of 12:56, 1 December 2021

The ARC is equipped with a dedicated computer server connected with a high-speed optical fiber network to the outside world, allowing fast data transfer (10 Gbit/sec).

Presently we have 200 Tb of diskspace and one 26 nodes cluster (112 cores) dedicated to the ARC.

ALMA and CASA users can request access to the server and the disk space by sending an e-mail to arc-support at ira.inaf.it indicating the reason for the request.

Blade.jpg

User policy

New ARC users can access the Italian ARC node computing facilities by requesting a face-2-face visit (ALMA users only, through the ALMA Helpdesk) or by visiting the ARC node in Bologna (for any data-reduction-related issue to be solved in collaboration with the ARC staff). In both the cases they are requested to send an e-mail to help-desk@alma.inaf.it indicating the reason for the request.

Please notice that the request for a new account for a new requesting user implies that he/she (and/or his/her collaborators) visits the ARC for an induction on the ARC facilities usage and on issues related to data reduction with CASA both for ALMA or any other telescope. If the request is positively evaluated the visit details will be arranged via e-mail.

The account will guarantee the usage of the facilities and the support for 6 months.

Once the account expires the access to the data will be suspended and, after 1 month of quarantine ALL DATA WILL BE REMOVED. Only one gentle reminder will be send on account expiration. Extensions of the account duration period could be considered on request (via e-mail). No visit is needed in case of account renewal.

The ARC members support is guaranteed for any ALMA-related issue. For data-reduction-related issues that do not involve ALMA, the support (other than the technical support in the usage of the ARC computing facilities) is limited to the knowledge/experience and availability of the ARC members.

The same rules apply also to IRA staff members. IRA collaborators with temporary positions (i.e. students) can have an account for the entire duration of their position.

To ensure a well-balanced load on the cluster nodes please follow instructions about accessing the computer cluster

Queries can be issued via e-mail to help-desk@alma.inaf.it

Users will be automatically added to the arc-cluster-users@ira.inaf.it mailing list that will be used for any communication from our side.

Accessing the computer cluster

Once you have obtained an ARC account at IRA, you can access the computer cluster nodes from everywhere through host scheduler.ira.inaf.it.. Using graphical applications on the cluster is possible through remote X access. The accessible working nodes are listed in the table below. You can enter a node for interactive work by typing:

ssh -X ''<node>''.ira.inaf.it

Useful tip: by typing 'hostname' you can know on which node you are

Here you can find some statistics about resources consumption on the arcblXX nodes.

Using ARC storage

You need to change directory to access your ARC storage on the cluster:

 cd /iranet/homesarc/''username''

On each node you can also use local disks on path /local/work/username (if allocated) and /local/scratch

/local/scratch will be emptied on every reboot

Beware that local disks have no redundancy at all, never leave important data on them

Mounting ARC storage on you workstation

On IRA workstations ARC home filesystem can be accessed on /iranet/homesarc

On your laptop ARC filesystems can be seamlessly accessed with fuse-sshfs:

as root, install the package sshfs

# on RedHat/Centos/ScientificLinux
yum install fuse-sshfs

# on Debian/Ubuntu
apt-get install sshfs

then, as user

sshfs storage.alma.inaf.it:/iranet/homesarc/yourhome /your/local/mount/point/

By omitting /remote/path you can mount you home directory.

Be aware that this method is suboptimal for heavy input/output loads. Running disk-intensive applications directly on the arc cluster will result in a file access speed 10-50 times faster.

Software packages available

Software available on ARC cluster could be listed typing the command setup-help or on this page

Computing Nodes

Name RAM CPU Cores Clock Data Net Work Disk Scratch Disk scheduler groups notes
arcbl17 64G AMD Ryzen 7 1800X 8/16 3600 1GbE 3,5TB N arc-staff, arc-vlbi
arcbl18 64G Intel Xeon E3-1275 v6 4/8 3800 10GbE 22T 57G N arc-staff, arc-vlbi Data transfer node
arcbl19 64G Intel Xeon E3-1275 v6 4/8 3800 10GbE 11T 57G N arc-staff, arc-vlbi, arc-f2f, arc-user NFS server
arcbl20 256G Intel Xeon E5-1650 v4 6/12 3600 10GbE 11T 65G N arc-staff, arc-vlbi
arcbl21 64G Intel Xeon E3-1275 v6 4/8 3800 10GbE 11T 57G N arc-staff, arc-vlbi
arcbl22 256G Intel Xeon E5-1650 v4 6/12 3600 10GbE 11T 65G N arc-staff, arc-vlbi, arc-f2f
arcbl23 256G Intel Xeon E5-1650 v4 6/12 3600 10GbE 11T 65G N arc-staff, arc-vlbi VM
arcbl24 256G Intel Xeon E5-1650 v4 6/12 3600 10GbE 11T 65G N arc-staff, arc-vlbi
arcbl25 256G Intel Xeon E5-1650 v4 6/12 3600 10GbE 11T 65G N arc-staff, arc-vlbi
arcbl26 256G Intel Xeon E5-1650 v4 6/12 3600 10GbE 11T 65G N arc-staff, arc-vlbi
arcbl27 64G Intel Xeon E3-1275 v6 4/8 3800 10GbE 15T 57G N arc-staff, arc-vlbi
arcbl28 256G Intel Xeon E5-1650 v4 4/8 3600 10GbE 15T 57G N arc-staff, arc-vlbi
arcbl29 256G Intel Xeon E5-1650 v4 4/8 3600 10GbE 15T 57G N arc-staff, arc-vlbi

Storage Nodes

Name RAM CPU Cores Clock Data Net RAID Space Storage export
arcnas2 32G Intel Xeon Silver 4108 8/16 1800 10GbE ARC-1883IX-24 91 12x10TB (HGST HUH721010ALE600) RAID6 /lustre/arcfs0/ost3
arcnas3 32G Intel Xeon Silver 4108 8/16 1800 10GbE ARC-1883IX-24 72,8 12x8TB (HGST HUH728080AL5200) RAID6 /lustre/arcfs0/ost0
arcnas4 16G Intel XeonE5-2603v3 6/6 1600 10GbE ARC-1284ML-24 36,4T 12x4TB (WDC WD4000F9YZ-09N20L1) RAID6 /lustre/arcfs0/ost1
91T 12x10TB (ST10000NM0086-2AA101) RAID6 /lustre/arcfs0/ost2