QNAP TS-451 User Manual

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Chapter 8. RAID Recovery
The QNAP NAS supports exclusive RAID recovery technology to recover a failed RAID disk
volume from unintentional disconnection or removal of the hard drives from the system.
Using the RAID recovery, users can recover an inactive RAID 1, RAID 5, or RAID 6 volume
to degraded mode, or an inactive RAID 0 and JBOD configuration to normal.
Disk volume
Supports RAID recovery
Maximum number of disk
removal allowed
Single
No
-
JBOD
Yes
1 or more
RAID 0
Yes
1 or more
RAID 1
Yes
1 or 2
RAID 5
Yes
2 or more
RAID 6
Yes
3 or more
RAID 10
No
-
If the volume status is not active, users can install the same hard drives back to the same
slots of the NAS. Then click “RECOVER” on the “Disk Management” > “Volume Management”
page. Wait for about 60 seconds for the process to complete. When finished, the data can
be accessed.
Note:
 After recovering a RAID 1, RAID 5, or RAID 6 disk volume from not active to degraded
mode by the RAID recovery, users can read or write the volume normally. The volume
status will be recovered to normal after synchronization.
 If the disconnected drive member is damaged, the RAID recovery function will not
work.

QNAP TS-451 Specifications

General

RAID levels	1, 5, 6, 10, JBOD
Storage drive size	2.5/3.5 \
Storage drive capacity	3000 GB
Supported file systems	ext3, ext4, FAT32, HFS+, NTFS
Storage drive interface	Serial ATA III
Storage drives installed	Yes
Installed storage drive type	HDD
Supported storage drive types	HDD & SSD
Total installed storage capacity	12 TB
Maximum supported storage capacity	- TB
Number of storage drives installed	4
Processor cores	2
Processor model	-
Processor family	Intel® Celeron®
Processor frequency	2.41 GHz
Flash memory	512 MB
Internal memory	1 GB
Internal memory type	DDR3L
Maximum RAM supported	8 GB
Wi-Fi	No
Ethernet LAN data rates	1000 Mbit/s
Supported network protocols	CIFS/SMB, AFP(v3.3), NFS(v3), FTP, FTPS, SFTP, TFTP, HTTP(S), Telnet, SSH, iSCSI, SNMP, SMTP, SMSC
Fiber ports quantity	0
USB 2.0 ports quantity	USB 2.0 ports have a data transmission speed of 480 Mbps, and are backwards compatible with USB 1.1 ports. You can connect all kinds of peripheral devices to them.
Chassis type	Tower
Cooling type	Active
Fan diameter	120 mm
Product color	White
LED indicators	HDD, LAN, Status, USB
Number of fans	1 fan(s)
Cable lock slot type	Kensington
Type	NAS
Device class	Home & Home Office
Backup features	Cloud, iSCSI LUN
Number of users	4096 user(s)
Security algorithms	256-bit AES, FIPS 140-2, HTTPS, SSH
Operating system version	4.1
Operating system installed	QNAP Turbo System
AC input voltage	100-240 V
Power supply location	External
Power supply unit (PSU) capacity	90 W
Cables included	AC, LAN (RJ-45)
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	5 - 95 %

Weight and Dimensions

Depth	235 mm
Width	180 mm
Height	177 mm
Weight	3000 g
Package weight	4300 g