Data Retention Practice of SACLA
Data System

Published on: 1st July, 2020
Enforced on: March, 2021
Issued by: The administrator of the SACLA data system

1/6

Preface
The practice rules were established in compliance with the data retention policy
enacted by the SPring-8 Data and Network Committee 1. This document describes
the rules of data retention and disposal in the SACLA data system.

1

http://dncom.spring8.or.jp/document/pdf/exp_data_policy.pdf
2/6

Revision History
Date30.6.2020

Description
First issue

3/6

1.

Data Retention & Disposal

The rules on data retention and disposal in the SACLA data system are definedfor the three data categories (A, B, and C) specified in the data retention policy of
the SPring-8 Data and Network Committee. Table 1 shows data retention rules
for respective data typ.
A) Data collected with the facility’s photon diagnostic systems, such as beam intensity
monitors and wavelength monitors (Data stored in the event-synchronized
database (SyncDB)).
These data are retained for 10 years since they are collected. For the first threeyears, the data are stored in the disk devices accessible from the SACLA HPC
system. After the three years, the data are transferred to the tape archive
inaccessible from the HPC system and retained for another seven years before
they are deleted.
B) Raw data from SACLA official detectors (such as MPCCD, OPAL, IMPERX)
These data are retained for eight years since they are collected. The data are
stored in the disk devices accessible from the HPC system for the first threeyears. After the three years, the data are transferred to the tape archive
inaccessible from the HPC system and retained for another five years before
they are deleted.
C) User-generated data
User-generated data are stored in one of the three directories below according tothe users' purpose. The data retention rules for each directory are as follows.
①/home/{account_name}

The quota limit for this directory is 100 GiB. The data in this directory will not
be deleted automatically.

4/6

②/work/{account_name}

This directory is intended to be used for short-term storage. Every user canhave this directory. The default quota limit for this directory is 5 TiB. Each fileis automatically deleted after 90 days from the date of the latest access to thefile.
Each group can increase the quota limit up to 100 TiB for a month at thelongest by asking SACLA HPC helpdesk if they need more quota temporally,for example, during a beamtime.
③/UserData/{account_name}

This directory is intended to be used for mid-term storage. The quota limit forthe directory is 100 TiB for each user. Each file in this directory isautomatically deleted after three years from the date of creation.

2.

Revision of the Data Retention Practice Rules

The administrator of the SACLA data system can change the practice rules and thequota limitations according to the actual usage state of the system. When theadministrator makes any changes to the practice rules, the administrator must
notify the changes to users, for example, on this website and/or the SACLA HPC
portal site.

5/6

Table 1. Data retention rules for respective data type.
Data type

Quota

Retention

limitperiodA) SyncDB-

10 yearsB) Storage raw data-

3 years

Comment/bl1strg/bl2strg/bl3strg# After the above period,-+5 years

・/home/<account_name>

100 GiB-・/work/<account_name>1-10 TiB

90 daysTemporary data

・/UserData/<account_name>100 TiB

3 years

Mid-term dataarchived on tape devicesC) User-generated data

6/6

User code