ZyXEL Communications NSA-2401 User Manual page 126

Chapter 6 Storage Screens
Encrypted Volumes
When you create a volume you can encrypt it using either a manually entered password or a
USB key. Others cannot read the data even if they take the physical drive. Encrypting a
volume does not affect how the volume's users use it. The NSA automatically encrypts data
the users write to the encrypted volume and de-crypts the data they read.
Keep an encrypted volume's password or USB key in a safe place. Without the
password or USB key, you cannot access the volume if it becomes locked. All
of the volume's data will be unusable.
Locked and Unlocked Volumes
Keep an encrypted volume unlocked to allows users to use its shares as normal. Lock an
encrypted volume to block all user access to its shares. The NSA automatically locks an
encrypted volume if the disk is removed or the NSA restarts, is reset (since a reset includes a
restart), or loses power. The administrator can also manually lock the volume. Once a volume
is locked, no one can use it until an administrator unlocks it. The NSA does not take snapshots
of a locked volume. See
Degraded Arrays
A degraded array is one that is damaged by a hard drive failure but can still be repaired by
replacing the failed drive. The array is still operational but at risk since all of the array's data
may be lost if a second hard drive fails. Data access may also be slower from a degraded array.
It's recommended that you replace the faulty disk and repair the array as soon as you can.
The NSA automatically repairs a degraded RAID if you insert an empty disk
without an existing file system. Otherwise, when you replace a disk you must
go to the Storage > Internal Storage > RAID screen and click Repair.
Down Arrays
When an array is down, it cannot be fixed. The array cannot be used and the data is lost.
Replace the faulty disk(s) and recreate the array, volumes, and sharing configuration.
Finding Out More
See Section 6.9 on page 151
levels used on the NSA.
Read Section 3.9 on page 106
126
Chapter 9 on page 195 for more on snapshots.
for theoretical background information on JBOD and the RAID
for how to increase the NSA's storage capacity.
NSA-2401 User's Guide