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DSNM - 04 Fault Tolerance & DR - Coggle Diagram
DSNM - 04
Fault Tolerance & DR
Network Storage
DAS
Server Attached Storage
Protocols
ATA
SATA
SCSI
FC
SAN
Definition
Protocol
Encapsulated SCSI (iSCSI)
Implementation
Single Building
Cascaded Hub
Tries to localize traffic
Advantages
Information Consolidation
Fast Retrieval
Easier Backup & Recovery
Scalability
NAS
LAN Attached File Servers
Protocols
NFS
CIFS
HTTP
Remote File Serving
Advantage
Easy to implement
Reduces application server CPU weight
Allows Data Sharing
Backup
Levels
Local Backups
Users Initiated
Less Bandwith utilization
More storage
Server Backup
Backup kept on a local or centralized server
Backup made available via LAN
More Bandwidth
More Time
User Initiated
Less storage
Limited Scalability
Enterprise Backup
Automatic backus to a backup server
More Bandwidth
Expensive
Limited scalability
Server-less Backup
Data is moved via a separate backup network /
FC SAN
Directly from disk to tape
Types
Full
Everything except swap
Not efficient
Weekly
Incremental
Only the changed files since
last backup
.
More efficient
Differential
Files that changed since the last
Full Backup
.
Archival / Selective
Only selected files and folders
What to backup
Data Files
Domain / Tree Databases
Domain Controller Registries
Offsite Storage /
Vaulting
Advantages
Regular & Automatic
Purpose built data centers
24 x 7 Monitoring & Support
Disadvantages
Access levels
Lower Speed
Cost
Security
Power
Provlems
Local Power Supply Failure
Voltage Variations
Short-term outages
Long-term outages
Defintions
Spike
Less than 2.5 Sec
Increase in voltage
Surge
2.5 or longer increase
Sag
(Dip)
2.5 Sec or longer
Decrease
Brownout
Long term decrease
Protections
Quality
Surge Suppressors
Short term
Line Conditioners
Filter & Smooth power stream
Expensive than Surge suppresors
surges, spikes & brownouts
Outages
UPS
Standby
Ferro-resonant standby
Line Interactive
Online
Generators