iSCSI Capacity | Indicates the capacity allocated to iSCSI. |
RAID Config | Press this to configure RAID volumes. |
Space Allocation | Press this to adjust the space allocated for data and iSCSI. |
RAID Configuration
On the RAID List screen, press the RAID Config button to go to the RAID Configuration screen. In addition to RAID disk information and status, this screen lets you make RAID configuration settings.
For more information on RAID, see Appendix C: RAID Basics.
RAID Level
You can set the storage volume as JBOD, RAID 0, RAID 1, RAID 5, RAID 6 or RAID 10. RAID configuration is usually required only when you first set up the device. A brief description of each RAID setting follows:
RAID Levels
Level | Description |
JBOD | The storage volume is a single HDD with no RAID support. JBOD |
| requires a minimum of 1 disk. |
RAID 0 | Provides data striping but no redundancy. Improves |
| performance but not data safety. RAID 0 requires a minimum of |
| 2 disks. |
RAID 1 | Offers disk mirroring. Provides twice the read rate of single |
| disks, but same write rate. RAID 1 requires a minimum of 2 |
| disks. |
RAID 5 | Data striping and stripe error correction information provided. |
| RAID 5 requires a minimum of 3 disks. RAID 5 can sustain one |
| failed disk. |
RAID 6 | Two independent parity computations must be used in order to |
| provide protection against double disk failure. Two different |
| algorithms are employed to achieve this purpose. RAID 6 |
| requires a minimum of 4 disks. RAID 6 can sustain two failed |
| disks. |
RAID 10 | RAID 10 has high reliability and high performance. RAID 10 is |
| implemented as a striped array whose segments are RAID 1 |
| arrays. It has the fault tolerance of RAID 1 and the performance |
| of RAID 0. RAID 10 requires 4 disks. RAID 10 can sustain two |
| failed disks. |
WARNING | If the administrator improperly removes a hard disk that should not be |
removed when RAID status is Degraded, all data will be lost. |
RAID Configuration
Using RAID Settings, you can select stripe size, choose which disks are RAID disks or the Spare Disk. .
RAID Configurations
Item | Description |
RAID | Check the boxes of the hard drives you wish to add to the |
| storage volume. |
Master RAID | Check a box to designate this as the Master RAID volume. See |
| the NOTE below for more information. |
Disk No. | Number assigned to the installed hard disks. |
| 29 |
