Network Disk Space at the SSCC

The SSCC provides a variety of networked storage.

This article is your guide to the disk space provided by the SSCC. Topics include:

  Key Locations at a Glance

Windows Linux Linux Space Accessed From Windows
Home Directory (Private Space)  U:  Drive  Z:  Drive
Project Directories (Shared Space)  X:  Drive /project  V:  Drive
Temporary Space  Y:  Drive /temp30days \\\temp30days-private    (must be mapped)

  Windows, Linux, and Silo

The SSCC has two parallel file systems: one for Windows and one for Linux. Thus you have two home directories, there are two project directories, etc. A program called Samba makes the Linux file system available to Windows, but not the other way around. This can be a big help to Windows users who are learning Linux, but if you're only using Windows programs Windows disk space will give slightly better performance.

The Silo environment has a separate secure file system. It is Linux-based system, and thus has only Z: and V: drives, not U: and X:. It also has an S: drive, or /smph, containing project directories for SMPH researchers.

  Private Space

Private disk space is provided in "home directories." In Windows, your home directory is the  U:  drive. In Linux your home directory is ~, or /home/{first letter of your user name}/{your user name (e.g. /home/r/rdimond). You can access your Linux home directory from Windows as the Z: drive.

Instructional and drop-in user's home directories are given of 20GB of space and each full member home directory is given 40 gigabytes of space. If you need more than this, consider requesting a project directory. To check how much space you're using in Windows right-click on your  U:  drive and choose  Properties; in Linux type quota.

Home directories are private: other SSCC users cannot access files in your home directory.

  Project Space

Project space is mainly for groups working together on a common project, though if you need more space than can be provided in your home directory it's possible to request a project directory for one person. Project directories can be as large as needed, but keep in mind that disk space is costly (see Managing your Space).

Windows project folders can be found on the  X:  drive. Linux project directories can be found under /project. Linux project directories are available from Windows on the  V:  drive. SMPH projects in Silo are found under /smph, available from Windows as the  S:  drive.

Each project directory has an associated group of users who can access the directory. Other users cannot. If you need access to a particular project directory, the owner of that directory must contact the SSCC Help Desk and ask that you be added to the group.

You can request a project directory by filling out a web form.

Normally project directories should be created in the same operating system (Windows or Linux) as the programs you'll be using. However, if you'll be using both Windows and Linux programs the directory should be created in Linux.

  Temporary Space

Both Windows and Linux have space where you can store files temporarily. Files placed in these spaces will be deleted after 30 days.

In Windows, temporary space is available on the  Y:  (Temp30days) drive. If you wish to use it, make a folder for your files (e.g. Y:\rdimond). The  Y:  drive is completely public: any SSCC user can read, change, or delete any file on the Y: drive. This makes it a convenient place for sharing files with others, however, it should never be used for confidential data (or for any serious research data, really).

In Linux, temporary space is available in /temp30days. If you wish to use it, make a subdirectory for your files (e.g. /temp30days/rdimond). Directories under /temp30days are private by default, but if you're familiar with setting Linux permissions you can make them public if you so desire.

If you need to access the Linux temporary space from Windows, you'll need to map a drive to it.

Note that temporary space is not backed up in either Linux or Windows. Temporary space is not intended for long-term storage of important files.

  Backups and Restores

Home and project directories, and system directories such as web sites, are backed up three times a day: see the SSCC Data Integrity Policy for details. Files on local hard drives (C: or D:) are not backed up. We hate to see anyone lose data, so please store all important files on the network where they are backed up  .

If you need a file restored, send the Help Desk an email with the following information:

  • The operating system the file was stored on (Windows or Linux)
  • The name of the file
  • The full location of the file (e.g. U:\dissertation\absolutely critical data or ~/dissertation/absolutelyCriticalData)
  • The date as of which you want it recovered (e.g. "the most recent backup")

If the file has been deleted and you don't know some of this information, just do your best and we can usually find it.

Please keep in mind that restoring files from backup takes a significant amount of staff time.

  Managing your Space

The SSCC uses Storage Attached Network (SAN) devices to provide disk storage that is extremely fast and reliable. However, this storage space is much more expensive than a regular PC hard drive—in fact disk space is a major component of the capital SSCC's budget. We're pleased to provide all the disk space our members need without charging individuals or projects, but please help keep costs down by using disk space wisely:

  • Compress large files that are not in active use.
  • Share large data files among researchers rather than everyone making their own copy
  • Delete intermediate data files that can be reproduced at will, keeping just the raw data and the version of the data you're currently working on (along with all the code that gets you from one to the other)
  • Delete data files that are no longer needed (but only if you're sure they're no longer needed)

Also see Managing Disk Space in Linux, and Using Compressed Data in Linux.

  Web Directories

In your Linux home directory you will find a directory called PUBLIC_web (Z:\PUBLIC_web from Windows). This directory can be used for a personal web site (though it must be focused on University business). The Linux directory /usr/global/web, available from Windows as  \\\web, contains departmental and agency web sites. /usr/global/cgi is used for web scripts. See Publishing a Web Site on the SSCC's Web Server for more information.

All of these directories are automatically read by the web server, and files and folders placed in them will be available on the web.

Keywords:network disk space x z   Doc ID:102660
Owner:Zach H.Group:Social Science Computing Cooperative
Created:2020-05-31 10:19 CDTUpdated:2023-04-18 12:29 CDT
Sites:Social Science Computing Cooperative
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