Lexmark X925 Lexmark Document Distributor - Page 28

System sizing guidelines, Peak demand

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Configuration Description Advantages Disadvantages X-Y-N Database (DB) on X computers in a Microsoft High availability, further Cluster Server for failover, load balancer (LB) on improved performance Y other computers in a Microsoft Cluster Server for failover, server on 1 or more additional computers Further increased hardware needs, cluster licensing LB (cluster) Server(s) DB (cluster) System sizing guidelines There are two main factors for determining the number of servers required to process jobs efficiently: • Peak demand-Usually the deciding factor when the average execution time for a solution is under 30 seconds • Concurrency-Usually the deciding factor when the average execution time for a solution is over 30 seconds Additionally, the database, when installed on the recommended hardware and connected using Gigabit Ethernet, can process 200,000 logged messages per hour, which is approximately 40,000 jobs per hour when using a typical solution (five logged messages per job). If this limit is reached, it may be necessary to use multiple LDD systems. Peak demand Use the following formulas to determine the number of servers necessary to handle peak loads for a particular solution: (System-wide hourly job rate) = (System printer capacity) x (Jobs per printer per day) / (Length of business day) (Peak demand) = 2 x (System-wide hourly job rate) (Minimum number of servers) = (Peak demand) / (Single-server throughput for current solution) Consider the following example: • Each server in your system can process 3000 jobs per hour using the solution. • There is capacity for 300 printers in your system. • Each printer in your system averages 100 jobs per day. Perform the following calculations: 1 Determine the system-wide hourly job rate: (300 printers) x (100 daily jobs/printer) / (8 hours/day) = 3750 jobs/hour 2 Determine the peak demand: 2 x (3750 jobs/hour) = 7500 jobs/hour Installing Lexmark Document Distributor 28

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Configuration
Description
Advantages
Disadvantages
X-Y-N
Database (DB) on X computers in a Microsoft
Cluster Server for failover, load balancer (LB) on
Y other computers in a Microsoft Cluster Server
for failover, server on 1 or more additional
computers
Server(s)
LB
(cluster)
DB
(cluster)
High availability, further
improved performance
Further increased hardware
needs, cluster licensing
System sizing guidelines
There are two main factors for determining the number of servers required to process jobs efficiently:
•
Peak demand
—Usually the deciding factor when the average execution time for a solution is under 30 seconds
•
Concurrency
—Usually the deciding factor when the average execution time for a solution is over 30 seconds
Additionally, the database, when installed on the recommended hardware and connected using Gigabit Ethernet,
can process 200,000 logged messages per hour, which is approximately 40,000 jobs per hour when using a typical
solution (five logged messages per job). If this limit is reached, it may be necessary to use multiple LDD systems.
Peak demand
Use the following formulas to determine the number of servers necessary to handle peak loads for a particular
solution:
(System-wide hourly job rate)
= (System printer capacity) x (Jobs per printer per day) / (Length of business day)
(Peak demand)
= 2 x (System-wide hourly job rate)
(Minimum number of servers)
= (Peak demand) / (Single-server throughput for current solution)
Consider the following example:
•
Each server in your system can process 3000 jobs per hour using the solution.
•
There is capacity for 300 printers in your system.
•
Each printer in your system averages 100 jobs per day.
Perform the following calculations:
1
Determine the system-wide hourly job rate:
(300 printers) x (100 daily jobs/printer) / (8 hours/day) =
3750 jobs/hour
2
Determine the peak demand:
2 x (3750 jobs/hour) =
7500 jobs/hour
Installing Lexmark Document Distributor
28