ZyXEL Communications NSA-2400 Guia do Utilizador descarregar pdf (Página 83)

NSA-2400 User’s Guide

83 Chapter 6 Storage

6.3.2 SINGLE

The RAID system stores the same data redundantly on multiple disks that nevertheless appear

to the operating system as a single disk. SINGLE does NOT make disks appear as a single

logical disk. SINGLE doesn’t have any advantages over using separate disks independently

and doesn’t provide any of the fault tolerance or performance benefits of RAID. However data

isn’t striped across disks, so if one disk fails, then you just lose the data on that disk.

Note: You will lose data if you change your volume type without backing up first! For

example if you originally have two disks configured at RAID 1, and you then

buy two more disks and want to configure all four at RAID 5, you should first

back up all your data on those disks (see the Genie Backup Manager utility on

the included disk) and then restore your data later after you create the new

volume type.

6.3.3 Volume Status

The status of a volume is determined by the file system. The status of a disk is determined by

the physical disk. If a disk is down, then the volume to which the disk belongs will also be

down or degraded if you’re using RAID 1 or RAID 5.

The status of a volume shows as Healthy if all disks in the volume are OK and the file system

is functioning properly.

The status of a volume shows as Resynching when you create or repair a RAID volume.

The status of a volume shows as Waiting Resync when there is already another volume

resynchronizing. Only one volume can resynchronize at one time.

The status of a volume shows Degraded when a volume is currently down, but can be fixed.

The status of a volume shows Down when a volume is down and can NOT be fixed.

A down RAID volume cannot be used until you repair or replace the faulty disk(s) in the

volume. Degraded means one of the disks in the RAID volume is not available but the volume

can still be used. If there is already another volume resynchronizing, then you will see

Waiting Resync as the volume status.

When a volume is degraded or down, all shares with share paths that use that volume are not

accessible so users cannot transfer files to/from shares in that volume. The share appears as a

folder in CIFS but a user cannot enter the folder to get or put data from or into it.

Note: There is no explicit message from CIFS that tells users their volume is

degraded or down; the only indication is that they can no longer transfer files to/

from the shares in the degraded volume. See your Quick Start Guide for more

information on replacing a disk.

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