Proactive data protection
RAID hot-spare and Global hot-spare drives
A hot spare drive can be configured so that if a hard drive in a specific RAID group fails, the hot spare drive will operate automatically. Moreover,
the QNAP storage also supports global hot spare drives which allow the administrator to share the spare drives efficiently among multiple RAID
Groups.
RAID Group 1
Global hot-spare protects
multiple RAID Groups in the
Turbo NAS
RAID Group 2
RAID Group 3
RAID Group 4
Hot spare
Global hot spare
For most important individual RAID
For All RAID Group
Single RAID hot-spare supportsRAID Group Group.
QNAP SMART data migration
Advanced RAID read error recovery technology
With the SMART data migration function enabled, the QTS
constantly monitors the disks on the Turbo NAS. If a possible
drive failure or abnormal health status is detected, the data will be
proactively migrated to a new spare drive, reducing potential data
loss and skipping the process of RAID rebuilding.
When read errors occur due to bad blocks on a hard drive, the
correct data on the bad blocks are automatically recovered with
other healthy hard drives. Users are guaranteed to always obtain
correct data. The process is run in the background, providing users
with a hassle-free experience.
1 Abnormal disk is detected
RAID Group
2 Migrate data to a spare disk
RAID Group
Spare Drive
3 Replace the abnormal disk
RAID Group
TLER and ERC support
RAID recovery
TLER (Time-Limited Error Recovery) and ERC (Error Recovery
Control) are now supported with compatible hard drives, improving
drive error handling in RAID applications. This further prevents the
hard drives from prematurely failing and forcing rebuilds & RAID
volume loss. The data will be retrieved more quickly when a hard
drive takes too long to respond from bad blocks.
With QNAP NAS exclusive RAID recovery technology, the RAID can
be recovered to a previous condition when more than the allowed
disks are removed from a RAID volume. On the other hand, the RAID
recovery technology is also helpful if the valid disk is removed by
mistake instead of the failed one, especially for businesses with
high-end Turbo NAS with many hard drives. The system will recover
to the degraded mode with just one click after all of the hard drives
are inserted back into the system.
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