User Manual

Troubleshooting
6-9
For Windows above to work around the 2TB limitation, choose bigger
sector size of a LUN (see 2.6.7 Storage provisioning on page 2-37).
However, you cannot use dynamic disk in Windows for the LUN with non-
512B sector size, and your data will be lost if you change the sector size of
a LUN. The table below shows the capacity correlated with sector size.
The latest partition table GPT (GUID Partition Table) and modern
operating systems, like Windows XP 64-bit, Windows 2003 server SP1,
Windows 2008 server, Windows Vista, and Linux 2.6.x kernel, support 64-bit
logical block addressing without the 2TB limitation. Using 512B as the
sector size (default) is fine.
2. Failed hard disk interrupts the background maintenance
tasks
To avoid unwanted overloading and risk, the reconfiguration task of a
disk group is paused and the disk scrubbing is aborted when a hard disk
of the disk group goes offline. If there is a spare disk or the failed hard disk
is replaced, the reconfiguration can be resumed after the disk data
rebuilding is done. For disk scrubbing, you’ll need to restart it manually.
3. Failed hard disk interrupts the background maintenance
tasks
To avoid unwanted overloading and risk, the reconfiguration task of a
disk group is paused and the disk scrubbing is aborted when a hard disk
of the disk group goes offline. If there is a spare disk or the failed hard disk
is replaced, the reconfiguration can be resumed after the disk data
rebuilding is done. For disk scrubbing, you’ll need to restart it manually.
4. Hard disk shows Unknown state
The configurations on the hard disks cannot be recognized by the
controller. You need to erase the configuration information on the hard
disks for your RAID system to use the hard disks.
If you need not to retain the data and the configurations on the hard
disks, you can clear configurations on the hard disks (see 2.10.1 Restoring
to factory settings on page 2-72). You may also turn off the On-line Array
Roaming option (See 2.7.16 Miscellaneous on page 2-56). With that, the
RAID controller will not check the stored configuration information of hard
disks and see any newly installed hard disks as hard disks without
configurations. You may remove and then re-install the unknown hard
disks to the system (either manually or by GUI, 2.6.1 Hard disks on page 2-
22). The hard disk state will return to “Unused” state.
If you need your data and configurations, please contact your system
supplier for solutions.
Table 6-1 The capacity correlated with sector size
Sector size 512B 1KB 2KB 4KB
LUN Size 0 ~ 2 TB 2 ~ 4 TB 4 ~ 8 TB 8 ~ 16 TB