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IOCELL Networks NetDISK User Manual Network Direct Attached Storage / NDAS

7 NDAS Bind Management

7.1 About NDAS Bind

Multiple NDAS devices can be used as if they are a single disk. This disk be created and

managed by the NDAS Bind Management tool. You can bind multiple NDAS devices

for more capacity per volume or protection from hard disk failures. NDAS supports three

bind types: Aggregation, Stripe (RAID0) and Mirror (RAID1).

A. Aggregation (also called spanned disk or JBOD)

• Allows up to 8 NDAS Unit Devices to be recognized as a single disk drive.

• Useful to create a large drive from many different size hard drives. The final

size will be close to the sum of the individual drive sizes.

• This bind does not provide any fault tolerance. If any unit fails, all data is lost.

• It is wise only to store backup data on this type of drive. Do not store primary

copies of your data on a non-fault tolerant bind.

• This bind style has a 2TB limitation and is not USB or eSATA accessible

B. Stripe (also called RAID0 or Fast RAID)

• Allows 2, 4, or 8 NDAS device units to be recognized as a single disk drive.

• Useful when you have several disks the same size and want to combine them

into a larger storage space. Capacity is roughly the smallest drive multiplied by

the number of drives included.

• This bind does not provide any fault tolerance. If any unit fails, all data is lost.

• It is wise only to store backup data on this type of drive. Do not store primary

copies of your data on a non-fault tolerant bind.

• Not USB or eSATA accessible

Warning: Because the block size of the striped disks is not 512 bytes, some

applications or operating systems may not access striped devices correctly.

C. Mirror (also called RAID1)

• Allows 2 NDAS device units to be mirrored. You can add one more NDAS unit

device as a spare disk.

• Provides fault tolerance. All data is written to both devices, so data can be

accessed even after one device fails.

• USB can read and write data to the primary disk.

Warning: Mirroring (RAID1) protects data only from hard disk failure. It cannot

protect data from logical file system error or incorrectly written data. You need to

backup your data to storage regularly to prevent these kinds of data loss.

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IOCELL Networks 351UNE Manual do Utilizador Página 39