Juniper STRM 5000, Hardware Installation Manual

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STRM 5000 NEBS Hardware Guide
B
M
AINTAINING AND
S
ERVICING THE
H
ARDWARE
The STRM chassis supports three types of field-replaceable units (FRUs) that you
can add or replace. The FRUs include:
• RAID Array
•
Power Supply
•
Cooling Fans
•
Fan Filter
RAID Array
The STRM appliance ships with hot-swappable hard disks to offer component
redundancy. The STRM 5000 NEBS appliance has a RAID10 configuration (16x
146 GB hard disks). You can hot-swap the disk if any one of the disks fails.
Redundant array of independent disk (RAID) is an organization of multiple disks of
fault tolerance and performance. It is used in the servers for data storage and to
replicate data among multiple hark disk drives. There are different RAID levels
designed to increase data reliability and increased I/O performance.
The key concepts in RAID are:
•
Mirroring - copy data to more than one disk
• Striping - split data across more than one disk
•
Error correction - redundant data storage to detect and resolve problems
The STRM 5000 NEBS RAID10 drives are striped for performance, and all striped
drives are mirrored for fault tolerance.
Power Supply
The STRM appliances has dual redundant DC power supply modules. If one
power supply fails, the second power supply assumes responsibility for the entire
power load. STRM appliances also have a AC power supply option if you need AC
power.
To hot swap the power supply module:
Step 1
Unplug the power cable of the power supply to power it down. Alarm may sound if
system is on and running with both power supplies.
Step 2
Remove the small power supply locking tab by unscrewing the thumb screw
located to the left between the two power supply modules. See
Figure 13 .