User manual

times (the number of hard disks in the array/2). It is recommended that

only hard disk drives of the same brand and capacity are used to create a

RAID 10 group. RAID 10 is suitable for high volume transaction

applications, such as a database, that require high performance and fault

tolerance. A maximum of 2 failed disks from 2 different pairs are allowed in

RAID 10.

Note:

To install a new disk when the server is running, first be sure the

disk volume is in the "degraded" mode. Or, wait to hear two long beeps

after the disk crashes and then insert the new disk in place of the failed

disk.

JBOD

Two or more disks can be combined into one larger volume. Files are

sequentially saved on physical disks. The overall capacity of the linear disk

is the sum of the capacity of all disks. This configuration does not provide

disk failure protection; failure of one drive will cause the entire array to be

lost. A JBOD group is generally used for storing a large amount of data. It is

not appropriate for storing sensitive data.

Bad Block Management (BBM)

BBM uses the bad block list (log) for each drive and uses it to allow the system to fail single

blocks rather than entire drives. This is especially useful for RAID arrays. Bad blocks in

different places on different drives can leave a RAID array that still has at least single

redundancy on all stripes. With this option, the RAID array can be functional even when

encountering these issues when the RAID is rebuilding.

Note:

BBM support is only available for RAID 5 and RAID 6.

Expanding RAID Group Capacity

With this function, RAID group capacity can be expanded by replacing hard disk drives in a

RAID group array one by one. This option is supported for the following RAID types: RAID 1,

RAID 5, RAID 6 and RAID 10. Follow these steps to expand a RAID group:

Go to "Storage Manager" > "STORAGE" > "Storage Space".

Double click a storage pool to bring up the Storage Pool Management page.

Select a RAID group and click "Manage" > "Expand Capacity".

Select at least one hard disk drive. After the description displays "Please remove this

drive", remove the hard disk drive from the NAS or expansion enclosure.