Disk Manager
Snare Central includes a Disk Manager utility that allows the administrator to easily increase storage capacity for event data allocation by adding extra hard drives to an existing system, or by allowing the server to connect to an existing NAS device.
Disk Manager also allows the administrator to have transparent access to data backups in CD, DVD or USB media created with the Snare Central Data Backup utility directly, without needing to restore data to the local hard drive.
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Snare Central disk layout
Snare Central complies with the “Red Hat Enterprise Linux 6 Security Technical Implementation Guide (STIG)” recommendation from the US DoD, and uses the Linux logical volume manager (LVM) to provide the following file system structure by default:
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If additional physical disk resources are assigned to the Snare Server, the Disk Manager objective will provide the ability to assign some or all of the available disk, to the partitions marked as compatible with resizing ("Yes") in the table above.
Interface
The Disk Manager user interface shows existing file systems represented as cylinders. It highlights the current space allocated and used. In the above example, the root file system is shown in black and is currently at 53% of capacity.
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Selecting, or hovering the mouse over a particularly cylinder, displays the filesystem status and disk summary information.
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Mounting a CD, DVD or USB
The following image shows the DVD dialog. This dialog provides the capability to mount and/or unmount a data backup device. Once the device has been made available, the data on the device is merged with the default Snare data archive, making it available to query through the Snare Server user interface.
Ticking the 'mount at startup' checkbox will modify the system filesystem configuration to make the change persistent after a reboot.
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Mounting a NAS
The NAS dialogue allows the user to mount or unmount a Network Attached Storage.
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- A name to identify this device (e.g NAS1 or central_storage).
- NAS IP address or name (FQDN) and port number to use.
- The type of NAS to attach to (CIFS or NFS)
- The share name inside the NAS as a path (or directory name in case of NFS).
- User name and Password.
- Workgroup if required (CIFS only).
- If access to this device after reboot is needed or not (this checkbox actually updates /etc/fstab system file so becomes persistent).
Resizing a local file system
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IMPORTANT. Before changing the sizes on any file system, unmount any NAS, DVD, CD or USB device from the server as it may interfere with the resizing process and lead to unpredictable results. |
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When resizing any file system all Snare back processes need to be stopped and depending on the size of the file system this could take several minutes. |
Adding a new hard disk to Snare archive
If no more disk space is available, the administrator can add another physical disk (or disks) to the server. After a system reboot, the new drive will be available as free space in the Disk Manager ready to be assigned to existing files systems as described.
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