<div style="border: 1px solid #A3B1BF; padding: .8em 1em; background-color: #E6F2FF; margin: 0px 1em;">'''NEW:''' [http://code.google.com/p/greyhole/wiki/MigrateFromWHS Widows Home Server Drive Extender Migration Guide]= What is Greyhole ==

'''NEW[http://www.greyhole.net/ Greyhole] is Amahi''' s [[Greyhole troubleshootingStorage pooling]] guide</div>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.

== What is You can add additional drives to your HDA and prepare them for use in Greyhole ==by following [[Adding_a_second_hard_drive_to_your_HDA|adding a second hard drive to your HDA]] guidance or use the Amahi [https://www.amahi.org/apps/disk-wizard Disk Wizard] (Amahi 8 or greater).

A new feature {{Warning|<div style<nowiki>=</nowiki>"color:darkred">You should <u>'''NEVER'''</u> change or delete files in the shared directories (''/var/hda/files/*'' by default) directly on the HDA, using the terminal, or the Gnome file browser, for the shares for which you checked the ''Uses pool'' option in the Amahi is dashboard. If you want to work with files on Greyhole shares on the HDA, you should [[Storage poolingMount Shares Locally]] using [http:.<br/><br/greyhole.pommepause.com/ Greyhole]. Storage Pooling is a technology to pool disk drives and make them look >You should be safe reading existing files directly, or adding new files directly, as long as if they were all part of a single don't care that your new files will only be moved into the storage pool of disk spaceduring the next check, which runs automatically at midnight (or manually using ''greyhole --fsck''). This feature is installed by defaultUntil then, but requires a few simple steps to begin utilizing the featuresyour new files will be stored in your shared directories (normally ''/var/hda/files/share_name/'').

You can add additional drives to Also, touching anything inside the '''gh''' directories that Greyhole creates at the root of your hda and prepare them partitions is a recipe for use in Greyhole by following disaster. [[Adding Greyhole not on root|We strongly discourage you from using the root partition in a second hard drive to your HDA|this tutorialpool]].</div><br/>}}

To add a drive to your Greyhole storage pool. First open your dashboard and navigate to the Shares tab. Then click on the Storage Pool sub-category. You will see a page similar to the one below. == Important Warnings ==<div style="color:darkred">You should '''neverNOTE:''' change or delete files in the shared directories All commands are executed as root user (''/var/hda/files/*'' by defaultFedora) directly on the HDA, using the terminal, or the Gnome file browser, for the shares for which you checked the ''Uses pool'' option in the Amahi dashboard. If you want to work preceded with files on Greyhole shares on the HDA, you should [[Mount Shares Locally]].<br/>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 sudo (or manually using ''greyhole --fsck''). Until then, your new files will be stored in your shared directories (normally ''/var/hda/files/share_name/''Ubuntu).

Also, touching anything inside == Amahi 7 or greater ==Amahi application [https://www.amahi.org/apps/greyhole-ui Greyhole UI] provides this capability. Refer to the '''gh''' directories that [[Greyhole_UI_App_Transition_Guide|Greyhole creates at the root of your partitions is a recipe UI Application Transition guide]] for disasterdetails on installation and configuration.

We '''NOTE:''' If you would still like to setup your Greyhole pool manually, please see [[Amahi_Create_Manual_Greyhole_Setup|Manual Greyhole not on root | strongly discourage you from using the root partition in a drive poolSetup]].</div><br/><br/>

== First things first Amahi 6 ==

You need to go in the Settings tab, and enable '''select [[Advanced_Settings|Enable Advanced Settings''']].<br/> Without Advanced Settings enabled, you won't see the following page and options.

== For <b><u>Storage Pool (Partitions) ==</u></b><br />

[[File:Storage_Pool_1.png|600px|thumb|left]]

[[File:Greyhole_Options_1.png|600px|thumb|left]]

Note'''NOTE: ''' Greyhole is not a backup solution. If a file is removed, all copies are removed. == Advanced Options ==

== You can further configure Greyhole advanced options ==by manually editing '''/var/hda/platform/html/config/greyhole.yml'''.

You can further configure Greyhole by manually editing the following file:<br/>'''NOTE:''' Options duplicated in ''/var/hda/platform/html/configetc/greyhole.conf will be overridden by grehole.yml'''.

To see what options are available, and what they do, refer to the [httphttps://greyhole.googlecodegithub.com/svngboudreau/Greyhole/trunkblob/master/greyhole.example.conf sample greyhole.conf] provided with Greyhole. greyhole.yml is in in [http://en.wikipedia.org/wiki/YAML YAML] format. Most of it should be easy enough to modify. The only exception would be the sticky_files (and optional sticky_into) options.<br/>

<pre>sticky_files <nowiki>= </nowiki> Music/ sticky_files <nowiki>= </nowiki> Videos/Movies/ stick_into <nowiki>= </nowiki> /mnt/hdd1/gh stick_into <nowiki>= </nowiki> /mnt/hdd5/gh sticky_files <nowiki>= </nowiki> Backups/CrashPlan/ stick_into <nowiki>= </nowiki> /mnt/hdd0/gh</pre>

<pre>sticky_files:

- - /mnt/hdd0/gh For your changes to be effective, you'll need to force Amahi to regenerate the greyhole.conf file. You can do so by editing a share, clicking it's path, and just clicking the Save button without actually changing the path. == Copying your data into Greyhole shares the first time ==</pre>

When you start using GreyholeOnce finished, it's important that you might want check to copy or move all your exiting files into your new shares that use see the file is properly formatted. To do so, do the storage poolfollowing: cd /var/hda/platform/html/config echo 'require "yaml"; YAML::load(File.open("greyhole.yml"))' | irb

Note: This is not necessary if your files are already in Amahi shares. If they are there, and you enable the ''Uses pool'' option in the Amahi dashboarddo not see any errors, the files will start getting moved around into the drives in then your storage pool during ready for the night (starting at midnight)next step. Otherwise, when the nightly storage pool check starts.<br/>The instructions below are for users who have more data to copy into the Greyhole shares than their currently free space in ensure you correct the /var/hda/files/ foldererrors before proceeding.

One way For the changes to do that is to mount the shares that use the Greyhole storage pool, either on the HDA itself, or on a client computer on your local network, and copy your data from their existing location into the mounted shares.This can be time consumingeffective, but it is the safest way you will need to force Amahi to use Greyhole.:

Another way to move your files from their current location into :<u>Ubuntu</u><br />:Regenerate the storage pool is to greyhole.conf file by editing a share their current location using an Amahi share that ''Uses pool', clicking it's path, then let Greyhole nightly check move and just clicking the files from there into Save button without actually changing the poolpath.

Here's a more detailed walkthrough for this method:<u>Fedora</u><br />:Restart the Dashboard with any one of these alternatives as [[Open_terminal|root user]]: :* touch /var/hda/platform/html/tmp/restart.txt:* systemctl restart httpd.service:* reboot

# Setup :Then regenerate the Greyhole Storage Pool greyhole set up by changing any setting in the Amahi dashboard, Shares > Storage Pool page.# Go or in the Shares > Shares page. In there, make sure you have an existing share for each share you have data for. Create new ones if you need, remove the ones you don't needDrive pooling.# Edit the ''path'' of each of those shares, and enter the current location of your existing data. For example, the Movies share could have a path <!--== ''/media/External Drive/Movies''# Enable the ''Uses pool'' option for each of your shares, and select the number of extra copies you'd like, if any.# Now, you either need to wait for Convert Greyhole'S nightly check to start, or you can start it manually from a terminal, as root, using this command: greyhole --fsck# Monitor /var/log/greyhole.log SQLite to see when the ''fsck'' operation is done.MySQL ==# Once ''fsck'' is done, your data has now been moved into the Greyhole storage pool (in the drives you selected in Shares > Storage Pool). All that should be left in the previous location of your data (''/media/External Drive/Movies'' from the previous example) should be symbolic links pointing to the new file copies. If the previous location is just empty directories (no symlinks), do not panic. This is normal if your previous location is an NTFS or FAT partition (drive).# Move all those directories / symlinks from there into the correct folders in /var/hda/files/share_name# Back already using MySQL in the Amahi dashboard, edit the path of the shares once again, and put back ''/var/hda/files/share_name'' (i.e. the folders where you moved the symbolic links)6.# If you used an NTFS or FAT partition for the previous location, you'll need another fsck to create the symlinks where they should be. Either wait for midnight, or launch it manually, from a command line, as root: ''greyhole --fsck''0

You're doneGreyhole was previously using SQLite as the default database for queueing up tasks on Amahi. All your existing data is now stored in the various drives included in your storage pool, and are accessible via the Samba shares you have defined in the This was unique to Amahi dashboardas Greyhole was originally designed to use MySQL for this task.

 == Adding a new drive to your HDA and storage pool == [[Adding_a_second_hard_drive_to_your_HDA]]  == /media ==Including any drive mounted as /media/Something in your storage pool is usually a bad idea.<br/>Those mounts are created by the ''gnome-automounter'', which requires you to be logged in into X (Gnome) to become available.<br/>This will create issues with Greyhole, which expects drives to always be available, and will take action when some of them are missing. Follow this guide to [[Adding a second hard drive to your HDA|permanently mount your drives]], before you include them in your storage pool. == Monitoring Greyhole ==Sometimes you might want to monitor what Greyhole is doing, for example when writing data to your greyhole shares for the first time. Here are a few commands you can type in a terminal to follow along. '''Scrolling view of total Greyhole operations queue:''' while [ 1 == 1 ]; do greyhole --view-queue | grep Total; sleep 60; done '''Scrolling log of what files Greyhole is working on right now:''' tail -f /var/log/greyhole.log == Convert Greyhole from SQLite to MySQL ==Greyhole is at the time of writing using SQLite as the default database for queueing up tasks on Amahi. This is unqie to Amahi as Greyhole was originally designed to use MySQL for this task. There are some major performance benefits to using MySQL over SQLite when writing large amounts of files. Switching can be especially useful when moving data to greyhole Greyhole shares for the first time. For now there is a script you can run if you want to switch over. This script has been tested to be safe while greyhole Greyhole is working but should be used with discresiondiscretion.

/usr/share/greyhole/db_migration-sqlite2mysql.sh

grep db_engine /etc/greyhole.conf-->

== Disable Greyhole Tips and Best Practices ==For those who do not use Greyhole, you can disable it. This is based on the fact you never have used it by enabling 'Uses pool' on any share. Recommend using extreme caution as this could have unpredictable results.

'''DO NOT''' attempt Check out the [[Greyhole grinder]] to remove the help make Greyhole package as it is a dependency of the HDA software. Doing so will break your HDArock solid.

= Testing and Reliability = References == Check out the * Good [[Greyhole grinder]http://revxatlarge.blogspot.com/2011/04/restoring-deleted-files-in-greyhole-and.html article] to help make on Greyhole rock solidwith terms explained.

= * [https://github.com/gboudreau/Greyhole Troubleshooting =/wiki Greyhole Wiki]: Provides additional guidance and information.

* [[https://github.com/gboudreau/Greyhole troubleshooting/wiki/MigrateFromWHS Windows Home Server (WHS) Drive Extender Migration Guide]] guide: Move from WHS to Amahi and Greyhole.<br />