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USAGE.md

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Using Archivetar / Archivepurge / Unarchivetar

Quick Start

Uses default settings and will create archivetar-1.tar archivetar-2.tar ... archivetar-N.tar This will tar every file as no --size cutoff is provided.

archivetar --prefix myarchive

Specify small file cutoff and size before creating a new tar

# the tar size is a minimum, so tars may be much larger than listed here. The
# size is also the size before compression
archivetar --prefix myarchive --size 20G --tar-size 10G

Expand archived directory

 unarchivetar --prefix project1

Upload via Globus to Archive

archivetar --prefix project1 --source <globus UUID> 
 --destination <globus UUID> --destination-path <path on archive>

Deleting files in Tars

archivepurge is a wrapper around drm from mpiFileUtils and is much faster than rm. It is intended to be used to remove all the files that were tard as part of archivetar but not any that were not. This is most commonly used to prep uploading a directory to an archive when not using Globus.

Run archivetar with --save-purge-list. This will create an extra file that is passed to archivepurge --purge-list <file>.cache.

Archiving Full Volumes

When trying to archive data from a volume without free space requires another volume with free space and using the --bundle-path option to redirect the creation of tars and indexes to an alternative storage location eg scratch or tmp. This option is safe to use with Globus transfers.

archivetar --prefix project1 --bundle-path /tmp/

Backups with Archivetar

NOTE archivetar is not meant to be a backup tool, but can fake it when used carefully. By using the filtering options --atime --mtime --ctime archivetar can select only files matching the filters specifically files that were changed. Incorrectly using settings can cause gaps resulting in data loss. We recommend repeating a full copy periodically to correct for any missing data.

Work-flow, grab all files modified sense last run of archivetar and placing them in their own folder.

Limitations, archivetar cannot track deletion of files. For users not using Globus (--destination-path) setting a size cutoff --size you can not tell what files larger than --size need to be copied. If using Globus those large files and the tars created are uploaded.

# initial full backup
archivetar --prefix full-backup --source <UUID> --destination <UUID>
--destination-path /path/on/dest/project/full/  

# 7 day later grab all files changed (ctime) less than 8 days ago (small overlap
# recommended)
archivetar --prefix inc-backup-7day --source <UUID> --destination <UUID>
--destination-path /path/on/dest/project/inc-7day/ --ctime -8

Archiving Specific Files (Filters)

archivetar wraps mpiFileUtils. Thus we are able to use many of the options in dfind to filter the initial list of files to only archive a subset of data.

NOTE If not using Globus to upload using the --size option you will not have an simple way without manually using dcp with the over.cache created by archivetar. So it is not recommended unless using Globus to upload the data to another location.

Currently archivetar understands the following filters:

 --atime --mtime --ctime --user --group

Multiple filters use logical and, eg --atime +180 --user brockp will archive only files accessed more than 180days ago AND owned by user brockp.

Filters are only applied in the initial scan. They are ignored if used with the --list option.

It is possible to use filters with archivepurge archive all files from a specific user and delete. Use --save-list rather than --save-purge-list because the first has ALL files to be archived, not just those in tars.

# find and archive all files owned by user `brockp` in given group space.
# scan once and get meta-data but do not archive
archivetar --prefix brockp-archive --user brockp --dryrun --save-list

# actually archive using list created above update timestamp
archivetar --prefix brockp-archive --list brockp-archive-<timestamp>.cache
--source <UUID> --destination <UUID> --destination-path
/path/on/dest/brockp-archive/ --size 1G

# once all transfer above finish delete file in the initial list
archivepurge --purge-list brockp-archive-<timestamp>.cache

Recovering Specific Folders (partial restores)

Restoring sub folders is a multi-step process.

  1. Pull back the DONT_DELETE.txt files
  2. (optionally) pull back the folder with big files if archived with --size <size>
  3. Find the needed tars with: unarchivetar --prefix my-prefix --which-archive --folder "exactfolder/subfolder"
  4. Recall the required tars returned by the prior command
  5. Expand: unarchivetar --prefix my-prefix --folder "exactfolder/subfolder"

Folder names must be exact and not have a trailing /. You can optionally use grep and look around the index and DONT_DELETE files yourself if unsure of the exact name.

Managing Globus Transfers

By default archivetar will hand off transfers to globus to manage and not wait for them to finish. This is ok in most cases but not ones where you want to know the transfer is complete before modifying / deleting data or scripting multiple archives.

The --wait option tells archivetar to wait for all Globus transfer to finish. It will also print print Globus performance information as it runs.

The option --rm-at-files implies --wait for tars only and not transfers created by the --size option.

Environment Variables

Several archivetar settings are controlled by environment variables (handy for setting or overriding defaults, or for site-specific customization, e.g. inside Lmod modules or personal shell starup files). See the configuration section of INSTALL.md for details.