QNAP TS-AI642 User Manual

Recovering unintentionally removed hard drives
The NAS supports exclusive RAID recovery technology to recover failed RAID groups from unintentional
disconnection or removal of drives. Users can recover an inactive RAID 1, RAID 5, RAID 6, RAID 10, or RAID 50
group from degraded mode.
RAID Type RAID Recovery
Support
Number of Disks Disk Failure Tolerance
Single No 1 N/A
JBOD No ≥ 2 N/A
RAID 0 No ≥ 2 N/A
RAID 1 Yes 2 1
RAID 5 Yes ≥ 3 1
RAID 6 Yes ≥ 4 2
RAID 10 Yes ≥ 4 (Must be an even
number)
One disk per subgroup fails.
RAID 50 Yes ≥ 6 One disk per subgroup fails.
Support and other resources
QNAP provides the following resources:
Resource URL
Documentation https://download.qnap.com
Compatibility List https://www.qnap.com/compatibility
NAS Migration Compatibility https://www.qnap.com/go/nas-migration
Expansion Unit Compatibility https://www.qnap.com/go/compatibility-expansion
Service Portal https://service.qnap.com
Product Support Status https://www.qnap.com/go/product/eol.php
Downloads https://download.qnap.com
Community Forum https://forum.qnap.com
QNAP Accessories Store https://shop.qnap.com
TS-AI642 User Guide
Troubleshooting 49

QNAP TS-AI642 Specifications

General

Brand	QNAP
Model	TS-AI642
Category	Storage
Language	English