Apple Xserve RAID Specifikace Strana 19
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Technology Overview
Xserve RAID
UPS support
A single Xserve RAID power supply can sustain the system in the event of a power
outage or electrical surge. Each RAID controller has its own DB-9 serial port, allowing
Xserve RAID to connect to and monitor up to two UPS sources. When the system
detects that input power has been switched to a UPS source, it changes the cache
mode from high-performance write-back to safer write-through cache—protecting
data transactions should the UPS fail. If the UPS system is capable of reporting a low
power level, Xserve RAID can alert the administrator of the condition, permitting a
manual shutdown before the power runs out.
Cache Backup Battery Modules
With optional Cache Backup Battery Modules in Xserve RAID, data transactions in the
RAID controller cache are protected for more than 72 hours after an input power failure.
Once power is restored, Xserve RAID writes the transactions and begins recharging the
batteries. If battery power is low, the system remains in write-through cache mode until
the battery charge exceeds 50 percent, when it returns to write-back mode.
Hot sparing
For each RAID controller, any drives not assigned to an array are automatically used
as global hot spares. If a drive fails, the RAID controller rebuilds its data on the spare
drive without requiring intervention by the administrator. The rebuild operation occurs
in the background while the controller processes normal host reads and writes—
so service continues uninterrupted.
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To promote the best mix of performance and
rebuild speed, the rebuild rate varies with the amount of trac, or fabric load, on the
RAID controller. As soon as the administrator replaces the failed drive, Xserve RAID
congures it as a new global hot spare for the array.
Easy serviceability
Power supplies, cooling modules, RAID controller modules, and hard drives can be
removed and replaced in seconds without tools. These components are all hot-
swappable, with the exception of the RAID controllers, which are warm-swappable,
meaning they can be replaced without interrupting data availability. In addition, Xserve
RAID has a shutdown feature that allows for planned maintenance without running
down the cache backup batteries. This feature can also be benecial if Xserve RAID is
stored for long periods of time.
- Xserve RAID 1
- Contents 2
- Introduction 3
- Product Overview 4
- High-Availability Design 5
- Deploying Xserve RAID 7
- Management 9
- Technology Overview 10
- Managing Volumes 12
- Managing Volumes with Xsan 12
- System Architecture 14
- Drive Technology and Capacity 15
- Passive Midplane Data Path 16
- RAID Controllers 16
- High-Availability Features 18
- Fibre Channel Interconnect 18
- Service, Support, and 20
- Training Options 20
- AppleCare Service Parts Kit 21
- Purchasing Information 22
- Related Products 23
- Technical Specications 24
- For More Information 25
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