4.3 How to use the MDAS terminals

The MDAS terminals^4.2 are computers constructed for SSH connection to the interactive data analysis servers and light processing. The large volume file system (/lfs[01-16]) and NFS areas for data migration (/ext_nfs[1-3]) are NFS mounted, so that data can be downloaded to the terminals efficiently.

4.3.1 System configuration

The MDAS terminals consist of 10 computers located in the Subaru building open-use room (sbt[01-10].ana.nao.ac.jp) and 8 computers located in the ALMA building room 101 (alt[01-08].ana.nao.ac.jp). There are desktop PCs and compact PCs in each room. The Rocky Linux 9 is installed as the Operating System.

Table 4.7: Specification of the MDAS terminals(desktop PC)

Host name	sbt([01-05]|alt[01-05).ana.nao.ac.jp
Machine	DELL Precision 3650
Quantity	10
OS	Rocky Linux 9
CPU	Intel Xeon E5 W-1950 3.3 GHz 6 core
RAM	DDR4-3200 RDIMM 16GB

Table 4.8: Specification of the MDAS terminals(compact PC)

Host name	(sbt[06-10]|alt[06-08]).ana.nao.ac.jp
Machine	Minisforum UM580B
Quantity	8
OS	Rocky Linux 9
CPU	AMD Ryzen 7 5800H 8C/16T 3.2GHz
RAM	DDR4-3200 DIMM 16GB

4.3.2 How to log-in

The MDAS terminals require the MDAS account. The login steps are as follows.

1. Input your account into the username field.
2. After that, input your password into the password field.

4.3.3 Disk spaces

The following disk areas are available from the MDAS terminals.

Table 4.9: Disk areas available from the MDAS terminals

Area	Mount point	Size per a mount point	Soft/Hard limit	Retention period
Large volume file system (NFS)	/lfs[01-16]	102TB	30TB/32TB	12 months
NFS areas for data migration	/ext_nfs[1-2]	393TB	9TB/10TB	NA
NFS areas for data migration	/ext_nfs3	306TB	9TB/10TB	NA

• In the MDAS terminals, user home directories are created for each terminal. User home directories (NFS) accessible from the interactive data analysis servers are not mounted.
• Before using the large volume file system or local disk area, please create a directory named your account under the disk areas.
• If your data volume reaches the soft/hard limit, application may not work normally (refer to Section 4.1.3 (Disk quotas) for details).
• Files exceeding the retention period will be target of the periodic data deletion (refer to Section 4.1.3 (Periodic data deletion) for details).

4.3.4 Network access control

SSH connection to the MDAS terminals is not permitted for a security measure. Access (i.e. ssh, scp, or rsync) from the terminals to devices on the NAOJ network is not permitted, either.