Snapshots; Iscsi Target Volumes; Indicators; Additional Information On Dynamicraid Sizing - Overland Storage SnapServer Administrator's Manual

SnapServer / GuardianOS 7.6 Administrator's Guide
When adding drives to a storage pool, the Web Management Interface displays the estimated
time required until the new drive will be available for storing data, and an estimate of the
final capacity that will be available when it is ready. Once the drive has been added to the
Storage Pool, any of the following may take place to maximize capacity:
• The filesystem may be expanded to cover the available space (see
Properties
• The snapshot space may be expanded (see
• Both the filesystem and snapshot space may be expanded within a unit. However, the
storage pool on one unit cannot be expanded to a different unit.
• Neither the filesystem nor snapshot space are expanded, but the parity is increased (see
To Add a Disk Drive to Upgrade Parity
When a drive is replaced in the storage pool, DynamicRAID rechecks its size to determine if it
is now larger than before the replacement. This way, drives in a DynamicRAID can be
replaced with larger drives one at a time, and once enough drives have been replaced with
larger drives to support the storage pool's parity setting, the additional space in the larger
drives will become available.

Snapshots

DynamicRAID utilizes current GuardianOS technology and snapshots the entire storage pool.
Provisioning for snapshots can be increased as the storage pool is grown to ensure the
percentage of storage reserved remains consistent. The directories inside the snapshot that
represent volumes can be shared individually by the administrator, rather than all at once, to
provide a level of access control.

iSCSI Target Volumes

All iSCSI targets use current SnapServer technology. DynamicRAID maintains the iSCSI
volumes on the storage pool in a location that is not visible to users.

Indicators

Drives can be inserted into the SnapServer NAS system at any time unless the user is
specifically instructed not to do so.
Each drive bay has an associated indicator which can be either red, amber, or green.
Indicators show the state of the storage pool.

Additional Information on DynamicRAID Sizing

All the drives in a chassis are considered part of a single storage pool on that unit and are
dynamically configured as such. The first drive detected in the storage pool is used as the basis
for the drive-size characteristics of the storage pool. These characteristics center around
whether the drive space can be evenly divided into either 300 or 500 GB-sized partitions.
For example, a large capacity drive (such as 1 TB and 2 TB SATA drives) will use 500 GB
partitions for the storage pool while a smaller capacity drive (such as 300 GB and 600 GB
SAS drives) will use 300 GB partitions. Then, all the other drives in the storage pool (or
added later) are configured using the same partition sizing.
10400589-001
in Chapter 5).
©2008-14 Overland Storage, Inc.
Adjusting Snapshot Space Size
in Chapter 5).
C - DynamicRAID Overview
Edit Volume
in Chapter 7).
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