The command s3qlcp can be used to duplicate a directory tree without physically copying the file contents. This is made possible by the data de-duplication feature of S3QL.
The syntax of s3qlcp is:
s3qlcp [options] <src> <target>
This will replicate the contents of the directory <src> in the directory <target>. <src> has to be an existing directory and <target> must not exist. Moreover, both directories have to be within the same S3QL file system.
You can get more information about a mounted S3QL file system with the s3qlstat command. It has the following syntax:
s3qlstat [options] <mountpoint>
This will print out something like this
Directory entries: 1488068 Inodes: 1482991 Data blocks: 87948 Total data size: 400 GiB After de-duplication: 51 GiB (12.98% of total) After compression: 43 GiB (10.85% of total, 83.60% of de-duplicated) Database size: 172 MiB (uncompressed) (some values do not take into account not-yet-uploaded dirty blocks in cache)
Probably the most interesting numbers are the total size of your data, the total size after duplication, and the final size after de-duplication and compression.
s3qlstat can only be called by the user that mounted the file system and (if the file system was mounted with --allow-other or --allow-root) the root user.
For a full list of available options, run s3qlstat --help.
The command :program:`s3qllock` can be used to make a directory tree immutable. Immutable trees can no longer be changed in any way whatsoever. You can not add new files or directories and you can not change or delete existing files and directories. The only way to get rid of an immutable tree is to use the :program:`s3qlrm` command (see below).
For example, to make the directory tree beneath the directory
2010-04-21 immutable, execute
s3qllock 2010-04-21
The s3qlrm command can be used to recursively delete files and
directories on an S3QL file system. Although s3qlrm is faster than
using e.g. rm -r, the main reason for its existence is that it
allows you to delete immutable trees as well. The syntax is rather
simple:
s3qlrm <directory>
Be warned that there is no additional confirmation. The directory will be removed entirely and immediately.
The s3qlctrl can be used to control a mounted S3QL file system. Its syntax is
s3qlctrl [options] <action> <mountpoint> ...
<mountpoint> must be the location of a mounted S3QL file system. For a list of valid options, run s3qlctrl --help. <action> may be either of:
flushcache: Flush file system cache. The command blocks until the cache has been flushed. dropcache: Flush, and then drop file system cache. The command blocks until the cache has been flushed and dropped. log: Change log level. cachesize: Change file system cache size. upload-meta: Trigger a metadata upload.