HP D2D D2D NAS Integration with CommVault (EH985-90934, March 2011) - Page 35

Device allocation, Multiple Media Agents and secondary mount paths, Shared access disk libraries

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2. It is also important to ensure that when housekeeping does run it has sufficient time to clear all the outstanding housekeeping jobs as shown below and there is sufficient "idle" time on the appliance. Device allocation In order to get the best deduplication ratio from a D2D device type HP recommend that similar data types be directed to the same device (VTL or NAS Share). This approach can tend to go against the CommVault Simpana automated storage management techniques and may require some manual configuration overrides. Multiple Media Agents and secondary mount paths CommVault allows some sophisticated approaches to using Disk Libraries, mainly shared access disk libraries and secondary mount paths. Shared access disk libraries Two types of shared access disk libraries can be configured. They are: • Disk libraries with a dynamic mount path (this refers to Disk Libraries based on FC disk arrays and so is not relevant to HP D2D NAS shares which are connected via Gbe or 10GbE) • Disk libraries with a static mount path - this can be applied to D2D NAS shares Paths Secondary mount paths can be used to create some end to end disaster recovery capabilities using HP D2D NAS shares. This technique allows a single Media Agent to have two paths and these two paths can be to different devices that are replicas of each other - this becomes very useful in recovery scenarios for ROBO sites as we will see later. Device allocation 35

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2.
It is also important to ensure that when housekeeping does run it has sufficient time to clear
all the outstanding housekeeping jobs as shown below and there is sufficient “idle” time on
the appliance.
Device allocation
In order to get the best deduplication ratio from a D2D device type HP recommend that similar
data types be directed to the same device (VTL or NAS Share). This approach can tend to go
against the CommVault Simpana automated storage management techniques and may require
some manual configuration overrides.
Multiple Media Agents and secondary mount paths
CommVault allows some sophisticated approaches to using Disk Libraries, mainly shared access
disk libraries and secondary mount paths.
Shared access disk libraries
Two types of shared access disk libraries can be configured. They are:
•
Disk libraries with a dynamic mount path (this refers to Disk Libraries based on FC disk arrays
and so is not relevant to HP D2D NAS shares which are connected via Gbe or 10GbE)
•
Disk libraries with a static mount path – this can be applied to D2D NAS shares
Paths
Secondary mount paths can be used to create some end to end disaster recovery capabilities using
HP D2D NAS shares.
This technique allows a single Media Agent to have two paths and these two paths can be to
different devices that are replicas of each other – this becomes very useful in recovery scenarios
for ROBO sites as we will see later.
Device allocation
35