View source for Group Storage

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This service provides large storage spaces, possibly shared between multiple Grid'5000 users. Those storage spaces are accessible on Grid'5000 over NFS.

For smaller storage space (under 200GB), [https://www.grid5000.fr/w/Storage#.2Fhome asking for a quota extension for your home] may be a better solution if you do not need to share data between users. You can also ask for a quota extension for your home in the range of 200-400GB if your request is limited in time (no more than one year).

Remind that '''Grid'5000 does NOT have a BACKUP''' service for storage it provides: it is your responsibility to save important data outside Grid'5000 (or at least to copy data to several Grid'5000 sites in order to increase redundancy). 

== Using an existing storage space ==

You must be a member of the group associated to storage space to access it. Contact the storage space owner to request an access.

=== On frontends and nodes on standard, nfs or big environment ===
Once you have been authorized, the storage space is available from nodes and frontends at:

<code class="host">node:</code><code class="command">cd /srv/storage/</code><code class="replace">storage_name</code>@<code class="replace">server_hostname_(fqdn)</code>

{{Note|text=Autofs is used to remotely mount storage. So they are automatically  mounted  when  accessed. The file systems are then automatically unmounted after a period of inactivity. That's why you may not see the directory when doing <code class="command">ls /srv/storage</code>, you have to access it before with <code class="command">cd /srv/storage/my-storage@server</code> for autofs to mount it.}}

{{Note|text=By default, the storage is created with some specific rights and ACLs:
* <code class="replace">s</code> on group permission: New files will be created with the same group as the parent directory
* sticky bit (<code class="replace">t</code>): Prevent deletion of file not owned.
* <code class="replace">g::rwx:</code> ACL:  Sub-directory will be created with 'rwx' access rights for group, you can check the ACLs with the <code>getfacl</code> command}}

For example:

<code class="host">node:</code><code class="command">cd /srv/storage/</code><code class="replace">my_storage</code>@<code class="replace">storage1.lille.grid5000.fr</code>

'''We strongly advise you to add a symbolic link to this path in your home for convenience :'''

<code class="host">node:</code><code class="command">ln -s /srv/storage/</code><code class="replace">my_storage</code>@<code class="replace">storage1.lille.grid5000.fr</code><code class="command"> ~/my_storage</code>

=== On other deployed environment or [[Persistent Virtual Machine]] ===
If you use a deployed environement (other than <code class="env">nfs</code> or <code class="env">big</code>) or a [[Persistent Virtual Machine]], you will need to use the [[Storage_Manager|storage API]] to enable access to the storage space. Contact the Grid'5000 team if needed.

== Request for a storage space ==

In this section, we list different use cases which lead to different ways to ask for a storage space in Grid'5000.

Each user joining Grid'5000 requests to be part of a GGA (Group Granting Access). A GGA is a group managed by an authority (ie: Research Team leader, Grid'5000 Site Manager) qualified to grant an access to the platform to a user for a certain amount of time. This access can include or not associated storage spaces, depending on the fact that the GGA is also a Storage Group.

To know if your GGA is able to grant access to storage spaces, just check into the User account Management System [https://api.grid5000.fr/stable/users/#myaccount] in the Groups section if the "Storage" keyword is displayed just after the "Granting Access" keyword of your GGA. If it is the case, ask to your GGA managers the list of storage spaces associated with their GGA.

There may be many of them, on different servers of different sites, and they are usually accessible under the following path:
  /srv/storage/GGA_NAME@STORAGE_SERVER_FQDN
  /srv/storage/ALT_NAME@STORAGE_SERVER_FQDN

=== Your GGA is not a team level GGA ===

For instance you belong to a site GGA like misc, site-misc (eg: nancy-misc).

Then proceed as described in the section "Request a new storage group".

=== You need to share data with users belonging to different GGAs than yours or a subset of members of your GGA ===

Then proceed as described in the section "Request a new storage group".

=== You need to store a significant amount of data for a limited time ===

Then proceed as described in the section "Request a new storage group".

=== An existing storage space associated with your GGA matches your needs ===

It is fine, you can use it right away by creating a directory of yours at the top level directory of the storage space (beware, you may have to follow some team guidelines to create your data space within this area).

=== An existing storage space associated with your GGA almost matches your needs ===

Typically, there is not enough space in it, but not so much (eg: the FS has 1TB available and you need 2TB).

In this case, ask to your GGA manager to request to support-staff for a size extension (maybe some cleanup in this storage space will be sufficient enough).

Please note that this is only relevant if your do not need a significant amount of data for a limited time (if you do, your are not in this use case).

=== None of the existing storage spaces associated with your GGA are matching your needs and you can share your data with other members of your GGA ===

For instance, to be as close as possible of the cluster's nodes you are doing your experiments, you want to use a team storage space in a site where it is not yet available.
 
Proceed as described in the section "Request a new storage group" but specify your GGA name as the name of the group (even if it does not start with sto).

=== Your GGA is not yet a Storage Group and you can share your data with other members of your GGA ===

Proceed as described in the section "Request a new storage group" but specify your GGA name as the name of the group (even if it does not start with sto).

In this case, we will inform your GGA managers that the GGA is promoted into a Storage Group and explain them what this imply (mostly benefits).

=== If nothing matches === 

Proceed as described in the section "Request a new storage group".

== Request a new storage group ==

To request a new storage space, please send an email to [mailto:support-staff@lists.grid5000.fr support-staff@lists.grid5000.fr]. Please copy/paste the following text and fill all the required information

* Email subject:

 Group storage creation

* Email content:

  What is your Grid'5000 login ?
     <...>
  What name do you want for your storage space ? (only lowercase letters and numbers are allowed)
     <...>
  On which site do you want the storage space ? You can also specify the server.
     <...>
  What is the name of the group you want to be linked with this storage space ? (Group name must begin by "sto-" unless it is a GGA ; Only lowercase letters ; Numbers and hyphen (-) allowed)
     sto-<...>
  Does the group already exists (from another storage space) ?
     Yes/No
  What size do you require for the storage space?
     XXX GBytes/TBytes
  What is the intended usage, in a few lines ?
     <...>
  What is the expiration date (We will contact you before removing your storage) ?
     <...>

The Grid'5000 team will create the storage space, and if the group is new, will create and set you as an owner of the group.

=== Available servers for storage spaces ===
{{:Generated/GroupStorage}}

=== Asking for storage extension ===
You can also contact the Grid'5000 team to get more space or to extend the expiration date of your storage. Just send a mail to [mailto:support-staff@lists.grid5000.fr support-staff@lists.grid5000.fr] with <code>Group storage extension</code> as subject and include the name of your storage, what extension do you need and why do you need it.

== Managing the group of users allowed to access the storage in [https://api.grid5000.fr/stable/users/ UMS] ==

{{Note|text=Groups have '''owners''', '''delegates''' and '''members'''. Owners and delegates have basically the same access rights with respect to membership management, but managing the group's meta-data such as its description is reserved to owners. '''You must be a member to be able to access the storage. An owner/delegate is NOT automatically added as a member.'''

}}

{{Note|text=You may have to wait up to 15 minutes after your mail is answered by the Grid'5000 team for the changes to take effect.}}
=== As a manager ===
==== Accept a request ====
Under the [https://api.grid5000.fr/stable/users/#groups '''Groups''' tab] at the bottom of the page you will find the pending request. You can accept the request and specify if the user should also be a owner or a delegate

==== Add a user to a group ====
Under the [https://api.grid5000.fr/stable/users/#groups '''Groups''' tab], you can see the list of groups you can manage and add user to them.
You can also add new owner and delegate

=== As a user ===
You can request to join an existing group storage via the '''Groups''' tab under [https://api.grid5000.fr/stable/users/#myaccount '''My Account'''].

Click on '''Join a new group''' and specify the group starting with '''sto''', the motivation and date limit.