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How StorTrends Tiered Storage and CSM Works
The main challenges faced in re-striping data between LDs are as follows:
Challenge
Solution
How often should the
Whenever an existing container is expanded with an LD of the same cost.
data be re-striped?
Or every hour, when an analysis of the data presented in each container present in the
system is complete.
When should the data
When the I/O load on the system is low. The reason for this is to not affect the bandwidth
be re-striped?
of the applications running above it. The method of predicting the I/O load on the system
at given point in time is done by the workflow analysis.
How should the data
The data should be re-striped in the manner that it is distributed equally across both the
be re-striped?
LDs and with the minimum number of movements.
In what order should
It is beneficial to re-stripe the most frequently accessed data first in the system. This is
the data be re-striped?
because this data, when it is re-striped, will be given a performance boost due to the extra
spindles, thereby having a net positive impact on the system performance.
Below is a pictorial representation of how the territories across the logical drives will be
striped when a container is expanded with a logical drive of the same cost.
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StorTrends/ManageTrends (version 2.7) Web Interface User's Guide for the StorTrends 2200 Storage Appliance
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