Fujitsu ETERNUS DX60 Product Introduction - Page 6

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Fujitsu ETERNUS DX60 Product Introduction

Block Diagram

Block Diagram
Host Interface
(Fiber Channel)
Controller
Interconnect
(PCI Express x4)
RAID-on-Chip
(RAID Controller)
SAS Expander
Product Introduction
ETERNUS DX60 and DX80
Battery Free Cache Protection (1)
Battery Free Cache Protection (1)
Reduced maintenance window
SCU* is maintenance free for 5 years
• Battery replacement was required every
three years in the previous models
Avoid data loss during extended power
outages
Migrating cache data to a nonvolatile memory
ensures unlimited data retention time
• Previously battery back up supported cache
data for approximately 96 hours
Cached write performance recovered
almost immediately after power restoration
SCU recharge time about 3 minutes
• Exact battery recovery time depends on how long the power has been
unavailable
In the event of a power failure, the data is migrated from cache to a nonvolatile RAM.
In the event of a power failure, the data is migrated from cache to a nonvolatile RAM.
For improved reliability, power for the migration process is supplied by a SCU* (System
For improved reliability, power for the migration process is supplied by a SCU* (System
Capacitor Unit) rather than a battery
Capacitor Unit) rather than a battery
Product Introduction
ETERNUS DX60 and DX80
Base System (a.k.a. Controller Enclosure)
CM#0
SCU
SCU
Nonvolatile
RoC
memory
LSI
Monitor
PLD
Expander
PSU
EXP#0
Monitor
PLD
Expander
PSU
Expansion Shelf (a.k.a. Drive Enclosure)
Panel
RoC
Cache
Cache
Expander
BP
BP
Panel
Expander
BP
BP
10
Copyright Fujitsu Technology Solutions, Release June 2009
11
Copyright Fujitsu Technology Solutions, Release June 2009
System Capacitor
CM#1
SCU
Controller Module
Nonvolatile
memory
LSI
Monitor
PLD
PSU
To Expansion
(SAS interface)
EXP#1
Monitor
PLD
PSU
SCU* supplies
power when power
fails
Nonvolatile
Memory
RoC
memory
LSI
Data
Migrate cache data to a
nonvolatile memory at high
speed through a dedicated line
• SCU is a unit with electric double layer
capacitor. Electric double layer
capacitor has the advantages of being
very resistant to degrading and by
providing a short recharge time
compared to traditional batteries.
Unit
Shelves
SCU
Memory
Data