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This tool is used to estimate the performance of the disk where you plan
to create the deduplication store. You can use this
tool to determine whether the disk, where you are planning to create
a deduplication store, is performing optimally. This tool simulates the
deduplication operation by querying and inserting a large number of records into the Deduplication Database. During simulation, when the
program detects slowness in the system, informational events are printed
out .
Use this tool to get the following estimates about the performance of
the disk:
- The Query & Insert average time for a given application data
size.
- The maximum
size of application data that can be backed up using the deduplication
database for a given time limit.
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Running the Utility To find out the maximum size of the
application data, perform the following:
- From the Start Menu, right-click the Command Prompt
and then click Run as administrator.
User Account
Control dialog box will appear, click Yes or Continue
depending upon the operating system version.
- From the Command Prompt, navigate to the following
location:
<software_installation_path>/Base
- Execute the following command:
sidb_sim.jar
The SIDB Simulator dialog box will be displayed with
the following options:
- Determine max data handled by the dedup database for given
threshold query response time
- Determine the average query response time for given application
data size
Determining the maximum application data size
You can find out
the maximum size of the application data that can be backed up using the deduplication
database for a given access time limit for each record.
To find out the maximum size of the application data:
- On the SIDB Simulator dialog box, select Determine max data handled by the dedup database for given
threshold query response time.
- In the Directory to use for Simulation, specify the directory and click
Continue.
- Specify the following parameters:
- Time Limit - The access time limit for each
record in microsecond.
- Dedup Ratio - The expected deduplication ratio
- Block Size - The deduplication data block size in KB
- Iterations for Sampling Query Time - Number of
iterations performed to determine the query and insert time
spent at a particular application datasize. The default value is 10000 iterations.
- Continue Simulation upto - The percentage of the
threshold time limit upto which the Simulation can continue
after the threshold has reached. For example, when you specify
10000 microseconds as the threshold time limit and set the Continue Simulation upto value
to 50%, the simulation will continue upto 15000 microseconds.
- If you want to estimate the disk performance statistics, select the
Measure Disk Performance check box.
- If you want to clean the
simulation data after the simulation is completed, select the clean db
files after simulation check box.
- Click Next.
- The SIDB Simulator dialog box displays the parameters and
its values. The tool will use these parameters to run the
simulation. Click Start to initiate the simulation process.
- The Simulation Report tab of the SIDB Simulator
dialog box displays the progress of the simulation process. Also a
graph of Query Time against Data size is displayed. Click Maximize to see the details in the graph.
Note
Each data point in the graph is calculated from the average of
the last x iterations; where
x is the number
of Iterations for Sampling Query.
- The Results tab of the SIDB Simulator dialog box displays
the results of the simulation. The results display the maximum size
of the application data that can be backed up using the deduplication
database for the given access time limit.
You can also view the results of the
simulation in the cmd_out.log file. This
file will be available in the SIDB folder on your disk.
Determining the average query response time
You can find out the the average query response time for each record
for a given data size.
To find out the average query response time:
- On the SIDB Simulator dialog box, select Determine the average query response time for given application
data size.
- In the Directory to use for Simulation, specify the directory and click
Continue.
- Specify the following parameters:
- Data Size - the application data size in GB
- Dedup Ratio - The expected deduplicaiton ratio
- Block Size - The deduplication data block size in KB
- Iterations for Sampling Query Time - Number of iterations
performed to determine the query and insert time spent at a
particular application datasize. The default value is 10000 iterations.
- Continue Simulation upto - The percentage of the
threshold time limit upto which the Simulation can continue after
the threshold has reached. For example, when you specify 10 GB as
the threshold data size and set the Continue Simulation upto value
to 50%, the simulation will continue upto 15GB.
- If you want to estimate the disk performance statistics, select the
Measure Disk Performance check box.
- If you want to clean the
simulation data after the simulation is completed, select the clean db
files after simulation check box.
- Click Next.
- The SIDB Simulator dialog box displays the parameters and
its values. The tool will use these parameters to run the
simulation. Click Start to initiate the simulation process.
- The Simulation Report tab of the SIDB Simulator
dialog box displays the progress of the simulation process. Also a
graph of Query Time against Data size is displayed. Click Maximize to see the details in the graph.
Note
Each data point in the graph is calculated from the average of
the last n iterations; where
n is the number
of Iterations for Sampling Query.
- The Results tab of the SIDB Simulator dialog box displays
the results of the simulation. The results contain the estimated
average transaction time for an insert/query in the deduplication
database based on the size of the application data that is backed
up.
You can also view the results of the simulation in the
cmd_out.log file. This file will be
available in the SIDB folder on your disk.
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CommVault provides software tools and utilities on an "as is" basis,
as a courtesy and convenience to its users, and they may be changed from
time to time without notice. These tools and utilities are provided
without express, implied, or statutory warranties of any kind. You
assume full risk and responsibility for the selection, possession,
performance and proper installation and use of the software tools and
utilities, and for verifying the results obtained there from. Your use
of CommVault software tools and utilities indicates your unconditional
acceptance of the above disclaimer.
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