A REFERENCE GUIDE FOR OPTIMIZING DELL™ MD1000 SAS SOLUTIONS VER A00
PAGE 34 5/06/2005
Performance both availability
and performance
provides capacity
scalability
performance enable
Write back cache
requirements for database
servers depend on
number of users
Web
Performance RAID 0 in Web
Server farms
provides maximum
performance of all
RAID levels
Split Topology
spanning RAID 0
across channels
provides better
performance if
daisy-chaining for
additional capacity
is not required
Enable read ahead
capabilities for
added performance
boost
Web server farms, usually
have multiple servers
providing replicated web
data. Thus, data
availability is handled at
server level
On-line
Transaction
High Availability RAID 10
provides highest
availability of all
RAID levels
Daisy-chaining
provides capacity
scalability
For added
performance enable
Write back cache
Recommendation targets
Enterprise applications
which require higher
availability than
performance.
In general for all OLTP,
data protection is of
utmost importance
File
Scalability RAID 5
maximizing
storage with some
data protection
Daisy-chaining
provides capacity
scalability
Enable Global Hot
Spare for improved
availability for RAID
5
These servers usually
have data backed up
periodically and hence,
require minimum data
protection from storage
components
Streaming
Media
Performance RAID 0
provides maximum
performance of all
RAID levels
Split Topology
spanning RAID 0
across channels
provides better
performance if
daisy-chaining for
additional capacity
is not required
Enable read ahead
capabilities for
added performance
boost
Performance is of utmost
importance for Streaming
servers. Data on these
servers is usually backed
up on external media such
as tape libraries or optical
media - CD/DVD
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