Troubleshooting
301
3.
In degraded mode, the health of the pool is
Degraded
. When rebuilding, the status of
pool and volume disk will display
Rebuilding
, the column
R%
in volume will display the
ratio in percentage. After complete rebuilding, the status will become
Online
.
TIP:
The dedicated spare cannot be set if there is no pool or the pool is set to
RAID level 0.
Sometimes, rebuild is called recover, they have the same meaning. This table describes the
relationship between RAID levels and recovery.
Table 14-1
RAID Rebuild
Operation
Description
RAID 0
Disk striping. No protection for data. Pool fails if any disk drive fails or
unplugs.
RAID 1
Disk mirroring over 2 disks. RAID 1 allows one disk drive fails or
unplugging. Need one new disk drive to insert to the system and
rebuild to be completed.
N-way mirror
Extension to RAID 1 level. It has N copies of the disk. N-way mirror
allows N-1 disk drives failure or unplugging.
RAID 3
Striping with parity on the dedicated disk. RAID 3 allows one disk drive
failure or unplugging.
RAID 5
Striping with interspersed parity over the member disks. RAID 5 allows
one disk drive failure or unplugging.
RAID 6
2-dimensional parity protection over the member disks. RAID 6 allows
two disk drives failure or unplugging. If it needs to rebuild two disk
drives at the same time, it will rebuild the first one, then the other in
sequence.
RAID 0+1
Mirroring of RAID 0 volumes. RAID 0+1 allows two disk drive failures
or unplugging, but at the same array.
RAID 10
Striping over the member of RAID 1 volumes. RAID 10 allows two disk
drive failure or unplugging, but in different arrays.
RAID 30
Striping over the member of RAID 3 volumes. RAID 30 allows two disk
drive failure or unplugging, but in different arrays.
RAID 50
Striping over the member of RAID 5 volumes. RAID 50 allows two disk
Summary of Contents for XCubeSAN XS5224D
Page 71: ...SANOS User Interface 49 nnnnn RPM Power Supply Local PSU n status Reset to Default Yes No...
Page 99: ...System Settings 77 Figure 6 14 System Information...
Page 315: ...Monitoring 293 Figure 13 5 Hardware Monitoring...
Page 327: ...Support and Other Resources 305 Figure 15 1 Download Service Package in the SANOS UI...
Page 331: ...Support and Other Resources 309...