Dell PowerVault MD3420 - Manual (Page 377)

For example, if you want to start a rollback operation for snapshot image 12345 in a snapshot group that
has the name snapGroup1, you would use this command:
start snapImage ["snapGroup1:12345"] rollback;
To start a rollback operation for the most recent snapshot image in a snapshot group that has the name
snapGroup1, you would use this command:
start snapImage ["snapGroup1:newest"]rollback;
Start SSD Cache Performance Modeling
Description
This command starts performance modeling for the SSD cache. Performance modeling monitors and
measures I/O activity for a period of time and estimates performance for various SSD cache sizes.
Performance is estimated using two metrics: cache hit percentage and average response time. The
performance modeling data is not available until you stop the operation using the stop ssdCache
performanceModeling command.
Syntax
start ssdCache [ssdCacheName] performanceModeling
Parameter
Parameter Description
ssdCache The alphanumeric identifier (including - and _) of
the SSD cache that you want to locate. Enclose the
identifier in square brackets ([ ]). If the SSD cache
name contains special characters or consists only
of numbers, you also must enclose the identifier in
double quotation marks (" ") inside square brackets.
Notes
Performance modeling ends and the performance modeling data is available when one of the following
conditions occurs:
• Run the stop ssdCache performanceModeling command.
• Retrieve the performance modeling data using PowerVault MD Storage Manager.
Performance modeling ends, but no data is available when one of the following conditions occurs:
• You reboot the RAID controller module.
• You make any changes to the SSD cache configuration.
• The state of the SSD cache changes.
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