NETGEAR Model Vehicle ReadyNAS OS 6.0 User Manual

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ReadyNAS OS 6.0
Add Protection to a Volume
Add Protection to an X-RAID2 Volume
X-RAID2 requires a minimum of two hard disks to provide protection against disk failure. If
you have a one-disk ReadyNAS storage system and want protection from disk failure, you
need to add a second disk that is at least as large as the first. It can be added while the
system is running. For more information about how to add a disk to your system, see the
hardware manual for your system, which is available at
http://support.netgear.com/product/ReadyNAS-OS6.
An X-RAID2 volume that includes two or more disks is automatically formatted to protect
a
gainst the failure of one disk. If you want to protect your data against the failure of two disks,
you must switch to Flex-RAID and select RAID 6. To use RAID 6, you must install four or
more disks. For more information about how to switch to Flex-RAID, see Change from
X-RAID2 to Flex-RAID on
page 21.
Add Protection to a Flex-RAID Volume
In certain cases, you can add a disk to a Flex-RAID volume to increase data protection. The
following table indicates whether adding a disk for data protection is possible for each
Flex-RAID configuration.
Table 3.
Number of Disks
per Volume
RAID
Level
Can I add a disk to for data protection?
1 RAID 1 Yes. (Additional disk provides redundancy.)
2 RAID 1 No. (Volume protection is already redundant.)
2 or more RAID 0 No. (RAID 0 does not offer protection.)
3 or more RAID 5 Yes. (Additional disk provides dual redundancy and converts the volume to
RAID 6
.)
4 RAID 10 No. (Volume protection is already redundant.)
4 or more RAID 6 No. (Volume is already protected with dual redundancy.)
Flex-RAID levels and data protection
Disks added to a Flex-RAID volume can only be used for protection. They cannot be used for
storage (horizontal expansion). If you want to add a disk for increased storage capacity, you
must do one of the following:
• Create a
volume using the added disks (see Create a Volume on page 27).
• Change
the RAID level (see Change to a Different RAID Level on page 23).
• Switch
to X-RAID2 (see Change from Flex-RAID to X-RAID2 on page 22).
To add a protection to a Flex-RAID volume:
1. Add
a disk to your ReadyNAS storage system.

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