How to restore files stored on the CLAS Linux network from Linux


You must have a CLAS Linux environment.
Restores are only available on network attached storage (NAS), including your home directory, /group, etc.,  Restoration is NOT available on local file systems such as /var/tmp or /tmp.

To see whether your lost files are on NAS, do the following.

cd directory_containing_lost_files
df . | grep netapp

lf the df command returns a string that contains clasnetappvm, then your lost files are on the CLAS Linux NAS and you can restore them. Otherwise, your files likely lost.


NAS on Linux clients is backed up via snapshot technology. Snapshots allow the recovery of files and directories that were deleted, corrupted or altered, without the intervention of the CLAS Linux Group staff.

A snapshot is a frozen, hidden, read-only view of files and folders at a specific point in time. The CLAS Linux Group have scheduled a number of different snapshots to help users with their restore needs, as follows:

  1. A hourly Snapshot is taken each hour. The last twenty four hourly Snapshots are available to view.
  2. A nightly Snapshot is taken each night at 12:00AM. Seven nights of nightly Snapshots are available to view.
  3. A weekly Snapshot is taken each Sunday at 12:00AM. Four weeks of weekly Snapshots are available to view.
  4. A monthly Snapshot is taken each month at 1:00AM on the first day of the month.  Three monthly Snapshots are available to view.

To access snapshots, cd into the hidden, read-only .snapshot directory contained in each directory. If you've deleted a directory and are trying to restore the deleted directory, you'll need to cd up a level and access the higher-level .snapshot directory.

Snapshots in each .snapshot directory are named based upon the age of the snapshot, as follows:

hourly.date_hour or daily.date_hour or weekly.date_hour

The following example shows the commands a person would type to restore their .cshrc startup file:

[hawkid@l-lnx000 ~]$ cd .snapshot
[hawkid@l-lnx000 .snapshot]$ ls
drna1(1790987470)_csg.7948  hourly.2014-10-06_2000   nightly.2014-10-03_0000
hourly.2014-10-06_1100      hourly.2014-10-07_0800   nightly.2014-10-04_0000
hourly.2014-10-06_1200      hourly.2014-10-07_0900   nightly.2014-10-05_0000
hourly.2014-10-06_1300      hourly.2014-10-07_1000   nightly.2014-10-07_0000
hourly.2014-10-06_1400      hourly.2014-10-07_1100   weekly.2014-09-22_0000
hourly.2014-10-06_1500      nightly.2014-09-30_0000  weekly.2014-09-29_0000
hourly.2014-10-06_1600      nightly.2014-10-01_0000  weekly.2014-10-06_0000
hourly.2014-10-06_1700      nightly.2014-10-02_0000

To restore your .cshrc file from October 6, 2014 at 8 pm, you would do the following:

[hawkid@l-lnx000 .snapshot]$ cd hourly.2014-10-06_2000
[hawkid@l-lnx100 hourly.2014-10-06_2000]$ cp .cshrc ~hawkid/

If you still can't find the file or directory you're looking for, or if you are looking for files older than a week or two, faculty and staff can send an email to