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466 bytes added ,  01:30, 17 January 2017
[[Category:apps]]
<div style="border: 1px solid #A3B1BF; padding: .8em 1em; background-color: #E6F2FF; margin: 0px 1em;">'''NEW:''' [https://github.com/gboudreau/= What is Greyhole/wiki/MigrateFromWHS Widows Home Server Drive Extender Migration Guide] '''NEW:''' [[Greyhole troubleshooting]] guide</div>==
== What [http://www.greyhole.net/ Greyhole] is Amahi's [[Storage pooling]] technology of choice. Storage Pooling combines the space of multiple disk drives and makes them look as if they were all part of a single pool of disk space. Greyhole was designed independently of Amahi, however, with feedback and great work, the Greyhole ==team made it suitable for integration with Amahi.
[http://www.greyhole.net/ Greyhole] is Amahi's [[Storage pooling]] technology. Storage Pooling combines the space of multiple disk drives and makes them look as if they were all part of a single pool of disk space.
Specifically, Greyhole:
* Combines the space from multiple drives into a single volume
* Distributes files across all drives in the pool
* Creates multiple copies of files in admin-specified shares
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Recommend you consult [https://github.com/gboudreau/Greyhole/wiki/WhatNotToPutInGreyholeShares what not to put in Greyhole shares] as a precaution when determining which shares to select.
This feature is installed by default, but requires a few simple steps to begin utilizing the features. You can add additional drives to your hda HDA and prepare them for use in Greyhole by following [[Adding Adding_a_second_hard_drive_to_your_HDA|adding a second hard drive to your HDA|this tutorial]]guidance or use the Amahi [https://www.amahi.org/apps/disk-wizard Disk Wizard] (Amahi 8 or greater).
{{Warning|
You should be safe reading existing files directly, or adding new files directly, as long as don't care that your new files will only be moved into the storage pool during the next check, which runs automatically at midnight (or manually using ''greyhole --fsck''). Until then, your new files will be stored in your shared directories (normally ''/var/hda/files/share_name/'').
Also, touching anything inside the '''gh''' directories that Greyhole creates at the root of your partitions is a recipe for disaster. [[Greyhole not on root | We strongly discourage you from using the root partition in a drive pool]].</div><br/>}}
'''NOTE:''' All commands are executed as root user (Fedora) or preceded with sudo (Ubuntu).
== Amahi 7 or greater ==<!Amahi application [https://www.amahi.org/apps/greyhole--Options available ui Greyhole UI] provides this capability. Refer to the [[Greyhole_UI_App_Transition_Guide|Greyhole UI Application Transition guide]] for install details on installation and configuration:.
* [[Amahi_7_Create_Manual_Greyhole_Setup|Manual Greyhole Install]] (no dashboard inegration)-->Amahi application [https'''NOTE://www.amahi.org/apps/greyhole-ui ''' If you would still like to setup your Greyhole UI] provides this capability. Refer to the pool manually, please see [[Greyhole_UI_App_Transition_GuideAmahi_Create_Manual_Greyhole_Setup|Manual Greyhole UI Application Transition guideSetup]] for details on installation and configuration.
== Amahi 6 ==
Check the option for "Uses pool" and choose the number of drives to replicate this share. In this instance we have chosen to use all drives available to the greyhole pool.
Note'''NOTE: ''' Greyhole is not a backup solution. If a file is removed, all copies are removed.
== Advanced Options ==
You can further configure Greyhole by manually editing '''/var/hda/platform/html/config/greyhole.yml'''.  :'''NOTE:''' Options duplicated in ''/etc/greyhole.conf will be overridden by grehole.yml.
To see what options are available, and what they do, refer to the [https://github.com/gboudreau/Greyhole/blob/master/greyhole.example.conf sample greyhole.conf] provided with Greyhole.
:Then regenerate the greyhole set up by changing any setting in Shares or in Drive pooling.
 
 
<!--== Convert Greyhole from SQLite to MySQL ==
Greyhole is already using MySQL in Amahi 6.0
grep db_engine /etc/greyhole.conf
-->
 
== Tips and Best Practices ==
 
Refer to [[Greyhole_Tips|Greyhole Tips]] for additional guidance.
== Testing and Reliability ==
Check out the [[Greyhole grinder]] to help make Greyhole rock solid.
== Reference References ==
* Good [http://revxatlarge.blogspot.com/2011/04/restoring-deleted-files-in-greyhole-and.html article] on Greyhole with terms explained.
* [https://github.com/gboudreau/Greyhole/wiki Greyhole Wiki]: Provides additional guidance for various tasksand information. * [https://github.com/gboudreau/Greyhole/wiki/MigrateFromWHS Windows Home Server (WHS) Drive Extender Migration Guide]: Move from WHS to Amahi and Greyhole.
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