Promise Technology Pegasus3 R4 User Manual

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Technology BackgroundPegasus3 Product Manual
A RAID 5 on Pegasus R4 consists of three or four physical drives. A RAID 5 on Pegasus R6 consists of
three to six physical drives.
RecommendedApplicationsforRAID5:
• File and Application servers
• WWW, E-mail, and News servers
• Intranet servers
RAID 6 – Block and Double Parity Stripe
RAID level 6 stores dual parity data is rotated across the physical drives along with the block data. A
RAID 6 logical drive can continue to accept I/O requests when any two physical drives fail.
Figure 5. RAID 6 stripes all drives with data and dual parity
Hence, a RAID 6 logical drive with (7) 100 GB physical drives has a capacity of 500 GB. A RAID 6
logical drive with (4) 100 GB physical drives has a capacity of 200 GB.
RAID6becomesmorecapacityefcientintermsofphysicaldrivesasthenumberofphysicaldrives
increases.
RAID 6 provides double fault tolerance. Your logical drive remains available when up to two physical
drives fail.
RAID 6 is generally considered to be the safest RAID level. A RAID 6 on Pegasus R4 consists of four
physical drives.
Advantages Disadvantages
• High Read data transaction rate
• Medium Write data transaction rate
• Good aggregate transfer rate
• Most versatile RAID level
• Disk failure has a medium impact on
throughput
Double Distributed (Wide-space Q+Q) Parity
Physical Drives
Data
Blocks

Promise Technology Pegasus3 R4 Specifications

General

Internal	No
Chassis type	Tower
Cooling type	Active
Device class	Small & Medium Business
Fan diameter	92 mm
Certification	CB, UL, cUL, TUV , BSMI, SPRING, BIS FCC, CE-EMC, VCCI, BSMI, RCM KCC
Product color	Black
LED indicators	Yes
Number of fans	1 fan(s)
Airflow (imperial)	70 cfm
Management platform	Pegasus Utility
Cable lock slot type	Kensington
RAID levels	0, 1, 1E, 5, 6, 10
Data transfer rate	40 Gbit/s
Storage drive size	3.5 \
Storage drive capacity	4000 GB
Storage drive interface	Serial ATA
Installed storage drive type	HDD
Supported storage drive types	HDD & SSD
Total installed storage capacity	16 TB
Maximum supported storage capacity	- TB
Number of storage drives installed	4
AC input voltage	100-230 V
AC input frequency	50 - 60 Hz
Number of power supply units	1
Power supply unit (PSU) capacity	250 W
Thunderbolt version	3
Thunderbolt ports quantity	2
Storage temperature (T-T)	-40 - 70 °C
Operating temperature (T-T)	5 - 35 °C
Storage relative humidity (H-H)	5 - 95 %
Operating relative humidity (H-H)	10 - 95 %
Cables included	AC, Thunderbolt

Weight and Dimensions

Depth	188 mm
Width	248 mm
Height	195 mm
Weight	6800 g