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VLS Automatic Performance Load Balancing
The VLS always "thin provisions" its virtual cartridges and dynamically load balances all the
incoming new backup data across the available back-end arrays to ensure that there are never
any performance hotspots. When any virtual cartridge is written (in any virtual tape drive), it
dynamically assigns which array LUNs will store the cartridge data based on which array LUNs
are least active. When you have multiple virtual cartridges written concurrently, the load is always
evenly balanced across the back-end arrays and will always provide maximum performance
regardless of which virtual cartridges are use for backup.
Figure 20 Storage Pool Load Balancing on the VLS
As
Figure 20 (page 54)
Provides clustered virtual cartridge file system across one or more arrays.
Automatically load-balances incoming backup data across all available array LUNs (in 32MB
extents).
Prevents performance and capacity hot-spots.
If a virtual cartridge is overwritten by the backup application (for example, because it reached the
end of the retention period and was reused for new backups), all of its existing blocks are freed
up and then new writes are dynamically assigned array LUNs as usual. When a new array is
added to the VLS, the load balancing system will automatically start using this new storage on
subsequent virtual cartridge writes (backups performed after the array was added will automatically
load balance across all storage including the new array). Any existing data that was present before
the new array was added will be rebalanced as virtual cartridges are recycled/expired and then
overwritten by the backup application.
54
VLS Devices
shows, the VLS storage pool:
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