Tuesday, October 09, 2007

Storage Space Allocation for Clients

In StoreGrid, you can specify a specific Storage Space Allocation for each system (StoreGrid ID*) which backs up to the Backup Server. This storage quota determines the actual disk space usage of the StoreGrid client. This value is auto-configured in the Backup Server when the client (new client which is not manually added) first connects to the Backup Server.

Please note that, when the client tries to backup data more than the Storage Space Allocation, the backup server breaks the backup process with the client with an error and makes sure that the Storage quota is never breached.

Normally, the client shares the free disk space allotted from the Server Storage Space allocation. For example, if your server storage space allocation is 100 GB, then the first client will automatically take all the storage space allocation of 100 GB.

If the second client connects the Backup Server after the first client has backed up, it shares the free storage space available like this,

Storage Space Allocated for Client = (Server Storage Space Allotted - Disk Space used by other Clients)/(no: of existing clients + 1[for the new client])

Let us assume, the first client has used 10 GB of storage space. Then the sharing will be, (100-10)/(1+1) = 90/2 = 45 GB. Now, the first client will be allotted with 10 GB (used space) - 45 GB (shared free space) = 55 GB (earlier this value was 100 GB). And the new client will be allotted with 45 GB (free space shared value). Thus the storage space allocation will be shared among the clients.

Since our StoreGrid 2.2, we have introduced another type of auto-configuration of StoreGrid clients, i.e., the StoreGrid Trial Clients [The clients who backup under the Trial Customer]. For these clients the default storage space allocation is taken from the 'Server Admin -> Customer Management -> Configuration Settings For Trial Clients'.

By default the Storage Space Allocation for the Trial Cliens is 100 MB. So, if you get a 'SG0083: Exceeding allotted backup space in the server' error on client backups, just go to 'Server Admin -> Customer Management -> Click on the Customer Name -> Click on Edit Client Configuration Action' and update the Storage Space Allocation for the client. You can also update the 'Server Admin -> Customer Management -> Configuration Settings For Trial Clients' such that the fresh Trial clients don't face such issue.

Possible help documentation to help you through setting up your clients under these scenario are,

1. Add New Client
2. Edit Existing Client Configuration
3. Configuration Settings For Trial Clients

If you still fall into issues, you most probably won't, you can contact the support on email storegrid-support AT vembu DOT com

* StoreGrid ID - This is the unique identity value used by the Backup Server to identify the StoreGrid clients. This is used mainly in grouping the backups in the Backup Server as well as used on Disaster Recovery situations to recover backup configurations of the client.

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