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Best Practices Guide 10
Table 2. Recommended settings for logical drive attributes
A
ttribute Name Value Rationale
Stripe Size 64KB Backup, restore, and deduplication I/O requests are usually
128KB, 256KB, or larger. A stripe size of 64KB can ensure the
VTL or SIR I/O request will stripe across as many drive
spindles as possible, hence achieving the best I/O
performance.
Read Cache Policy Read Ahead VTL restore or SIR read requests are sequential for single
streams. The Read Ahead setting boosts performance for
sequential I/O. Even in the case of multiple stream reads,
Promise lab tests indicated it boosted the performance
significantly, combined with Force Read Ahead enabled at the
controller level.
W
rite Cache Policy Write Back VTL backup requests are sequential write operations for
single stream. However, a VTL appliance can usually serve
multiple backup clients simultaneously. With multiple stream
VTL backup, the write access becomes random. By enabling
the Write Back cache, it avoids performance degradation due
to random drive access, therefore improving the performance
dramatically.
Other Attributes Leave as default
Initializing the Logical Drives
After creating the logical drives, make sure to initialize all of them. This action ensures optimal performance.
Depending on the capacity of the logical drives, it may take 40 minutes to a few hours to initialize all of the logical drives.
Therefore, you are wise to plan ahead before running a performance test or placing a solution into production.
For detailed instructions about how to initialize logical drives, please refer to VTrak E610f Product Manual. You can find all
of the Product Manuals on the Promise website under the Downloads section (Support > Downloads).
Setting up Access Control
This section offers instructions and recommendations for how to assign storage to VTL as well as how to assign VTL tape
to VTL clients in a SAN topology. These recommendations apply to SAN topologies only.
Assigning Storage to VTL
Assigning storage to VTL can be achieved either through configuring zoning on the Fibre Channel switch or through
configuring LUN Mapping on the VTrak E610f. This best practices guide provides instructions on configuring LUN
Mapping on the VTrak E610f. For instructions on configuring zoning on the Fibre Channel switch, please refer to the Fibre
Channel switch User Manual.
Enabling LUN Mapping
By default, LUN Mapping is disabled on the VTrak E610f. When LUN Mapping is disabled, all of the logical drives on the
external array storage subsystem are accessible to all of the Fibre Channel initiator hosts. For a DAS topology or for a
SAN topology using zoning access control, LUN Mapping should be disabled.
However, for a SAN topology with access control set through LUN Mapping, LUN Mapping must first be enabled on the
subsystem before access control can be configured. Please refer to the VTrak E610f Product Manual for detailed
instructions on how to enable LUN Mapping.
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