AudioCodes MP-26 series, Руководство пользователя

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User's Manual 17. Add-On Servers and Disk Management
Version 4.4.0 313 MP26x/MP27x
17.2.3 RAID Management
The device supports Redundant Array of Independent Disks (RAID) on storage devices
connected to it by USB or by FireWire. A RAID device is a logical device that has physical
devices underlying it. These physical devices are disk partitions. The supported RAID
levels are:

Level 0 – Provides data striping, or spreading out blocks of each file across multiple
disk drives, but no redundancy. This improves performance but does not deliver fault
tolerance. If one drive fails then all data in the array is lost.

Level 1 – Provides disk mirroring. This is a technique in which data is written to two
duplicate disks simultaneously, providing data redundancy. This method improves
performance and delivers fault tolerance.

Level 5 – With a minimum of three disks, this level provides data striping and utilizes
one disk for backup information, which enables it to restore any other disk in the array.
Before creating the RAID device, you must create disk partitions (as described previously)
on the different disk drives. Each RAID device can have multiple underlying devices
(partitions). When using RAID1, it is recommended that these partitions be of the same
size to avoid disk-space loss due to mirroring. A disk partition configured with RAID can no
longer be managed as a regular partition, but only be controlled by the RAID device. From
the moment RAID is configured, it is the RAID device that can be shared, scanned,
formatted and mounted as a regular partition.
17.2.3.1 Creating a RAID Device
The procedure below describes how to create a RAID device.

To create a RAID device:
1. In the RAID Devices table in the ‘Disk Management’ screen, click the Add RAID
Device link; the 'RAID Properties' screen appears:
Figure 17-18: RAID Properties Screen
2. From the ‘RAID Level’ drop-down list, select the RAID level (RAID0, RAID1 or RAID5).
3. In the 'Mount Point' field, enter a name for the mount point of the RAID device.
4. Choose the underlying devices (your pre-configured partitions) in the next drop-down
lists. For RAID1 you may choose only one device and later add another one.