Use of Storage

All users can use each home directory. Users of the Personal Course, Group Course, and Private Cluster Course can use large volume disk (LARGE). If you deal with a large-scale data in the Personal Course, Group Course, and Private Cluster Course, please use large volume disk (LARGE). If you are using a program that requires high I/O performance, you can improve performance by using high-speed storage.

The home directory path is shown below: You can also use it as a location to install software for your own use.

  • The available capacity is 100 GB. (User Quota)]
  • The "b" part in the path is the first letter of the user number.
  • We save backups on a regular basis, approximately once a week.

Large volume disk (LARGE) is available for the Personal Course, Group Course, and Private Cluster Course. Since the system has high performance by being configured with a large number of storage drives, please use large volume disk for file access with large volume files or parallel computing.

LARGE configuration for personal course is shown below.

  • The total available capacity is 3 TB.
  • It is configured with two separate file systems.
  • By default, /LARGE1 is used as backup area.

LARGE configuration for group course and private cluster course is shown below. Please make a directory for each user under the group directory.

  • The available capacity will be allocated according to the storage capacity and the additional computing resources　you request.
  • It is configured with two separate file systems.
  • By default, /LARGE1 is used as backup area.

Users of the personal course or payment manager of the group course can change the backup settings for large volume disk. If you emphasize data redundancy, enable backup; if you emphasize available capacity, disable backup. The frequency of backups is targeted to be about once a week for small-scale use and once a month for larger groups with tens of millions of files.

Please refer to Backup Settings for the setup procedure.

The previous system consisted of four LARGES of /LARGE0, /LARGE1, /LARGE2, and /LARGE3, however this system have been changed to two LARGES of /LARGE0 and /LARGE1. Data in /LARGE2 is put together in /LARGE0 and data in /LARGE3 is put together in /LARGE1, however symbolic link is also set so that you can access files with conventional paths.

Please note that the symbolic links may be deleted in the future, so please update your paths accordingly.

$ ls -ld /LARGE?
drwxr-xr-x 201 root root 12288 Nov 18 11:46 /LARGE0
drwxr-xr-x 202 root root 12288 Nov  7 18:17 /LARGE1
lrwxrwxrwx   1 root root     7 Nov  8 10:30 /LARGE2 -> /LARGE0
lrwxrwxrwx   1 root root     7 Nov  8 10:31 /LARGE3 -> /LARGE1

High-speed storage is available for Personal Course, Group Course, and Private Cluster Course. High-speed storage is configured with SSDs and has high throughput, however the capacity is not that large.

To take advantage of the high throughput, please use it for input/output of the calculations and avoid using it for long-term data storage.

When you need to save calculation results, please move them to Large Volume Disk(LARGE) to take advantage of the capacity and the performance of the high-speed storage.

In FY2024, we provide 500 GB per person for personal course users and 400 GB to 1000 GB per node (depending on the type) for group course users as a trial period. Please check quota -p for details on the available capacity.

High-speed storage consists of the following.

  • The available capacity will be sized according to the computing resources you apply for and the additional capacity of the Large Volume Disk.

High-speed storage (FAST) does not take backups. Please make your own backups as appropriate. In addition, they are not subject to data migration at the time of the system renewal.

You can check the current usage status of the disk with the quota command.

  • kbytes: File capacity in use（KB）
  • quota: File capacity/Limit of the file number (soft limit)
  • limit: File capacity/Absolute limit of the file number (hard limit)
  • grace: Allowable period over the limit (over the soft limit)
  • files: Number of files in use

$ quota -u b59999
Disk quotas for user b59999 (uid 59999):
  Filesystem       kbytes         quota         limit grace    files     quota     limit grace
       /home     17859980     100000000     110000000     -    69218   1000000   1100000     -

LARGE limits the capacity with Project Quota. Specify the -p option to the quota command and execute.

$  quota -p
Disk quotas for project gr19999 (pid 19999):
  Filesystem       kbytes        quota        limit grace    files    quota    limit grace
     /LARGE0   2088651052   8000000000   8050000000     -    90543 16000000 16100000     -
     /LARGE1   1967559464   8000000000   8050000000     -    90544 16000000 16100000     -
     /FAST   762012   500000000   505000000     -    4544 16000000 16100000     -