Processing Heat Log Files; Thin Provisioning - IBM Storwize V5010 Manual

9.2.17 Processing heat log files

IBM Storage Tier Advisor Tool takes input from the dpa_heat log file and produces an HTML
file that contains the report. Download the heat_log file, as described in 9.2.14, "Downloading
Easy Tier I/O measurements" on page 459, and save it to the hard disk drive (HDD) of a
Windows system.
On Windows navigate to Start → Run, enter cmd, and then click OK to open a command
prompt.
Typically, the tool is installed in the C:\Program Files\IBM\STAT directory. The command to
create the index and other data files is has the following parameters:
C:\Program Files\IBM\STAT>STAT.exe -o c:\directory_where_you_want_the output_to_go
c:\location_of_dpa_heat_data_file
Example 9-10 shows the command to create the report and the message that is displayed
when it is successfully generated.
Example 9-10 Generate the HTML file
C:\EasyTier>STAT.exe -o C:\EasyTier C:\StorwizeV5000_Logs\dpa_heat.31G00KV-1.101
209.131801.data
CMUA00019I The STAT.exe command has completed.
C:\EasyTier>
If you do not specify -o c:\directory_where_you_want_the output_to_go, the output goes to
the directory of the STAT.exe file.
IBM Storage Tier Advisor Tool creates a set of HTML files. Browse to the directory where you
directed the output file and locate the file that is named index.html. Open the file by using
your browser to view the report.

9.3 Thin provisioning

In a shared storage environment,
available storage. It relies on allocating blocks of data on demand versus the traditional
method of allocating all of the blocks up front. This methodology eliminates almost all white
space, which helps avoid the poor usage rates (often as low as 10%) that occur in the
traditional storage allocation method. Traditionally, large pools of storage capacity are
allocated to individual servers but remain unused (not written to).
Thin provisioning presents more storage space to the hosts or servers that are connected to
the storage system than is available on the storage system. The IBM Storwize V5000 Gen2
supports this capability for Fibre Channel (FC) and Internet Small Computer System Interface
(iSCSI) provisioned volumes.
An example of thin provisioning is when a storage system contains 5000 GiB of usable
storage capacity, but the storage administrator mapped volumes of 500 GiB each to 15 hosts.
466
Implementing the IBM Storwize V5000 Gen2 with IBM Spectrum Virtualize V8.1
thin provisioning
is a method for optimizing the usage of