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Lattus A10 Access Node Installation Guide
Step 4: Install and Configure Lattus A10 Software and NAS Services
Note: Note 4: The segment size is rounded up internally to a
power of 2. For example, if the segment size is configured
to 10 GB, the final segment size applied is 16 GB.
Note: Note 5: If you select global policy and then click Edit, you
can make changes to the following parameters:
• Truncation low water mark: The percentage of the file
system fill level that truncation intends to achieve. By
default, this value is set to 65.
• Truncation high water mark: The percentage of file system
fill level that triggers truncation. By default, this value is set
to 75.
• Truncation age: The minimum time that an ingested file
must remain unchanged before it can be truncated. By
default, this value is set to 1 hour.
When the truncation high/low water mark is set to non-zero
values, truncation starts after file system fill level reaches
the configured high water mark, and truncation candidates
older than truncation age are truncated. Truncation stops
when the low water mark is reached.
• Max segment size: The amount of data being written to a
file before an ingest event is generated. By default, this is
set to 64 GB. StorNext generates an ingest event if 64 GB of
data is written to a file. For example, a file of size 100 GB
will have two events generated. The first event is generated
when 64 GB is written. The second is generated when all
data has been written and the file is closed.
Note: Note 6: You can configure a policy to truncate files
immediately, using either the GUI or CLI as follows:
• In the GUI, from Configuration > Storage Policies, change
the minimum and maximum truncation times to zero. This
sets truncation on files at the file system level.
• From the CLI, configure the policy using:
snpolicy -truncate=dir_path
Configuring objs.conf
49
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