«©ARRIS 2014. All rights reserved. 2 INTRODUCTION Linear ad-insertion servers have as their primary function the scheduling and streaming of ad ...»
For smaller caching ad-server deployments, a 45-day-equivalent storage cache will require up to 200 to 400 GB net (not including RAID and other overheads). Medium-sized systems will be well-served with approximately 500 GB to 1.0 TB of net storage. The largest systems could require 1 to 2 TB of net storage and will likely be clustered systems. For example, the ARRIS XMS-1U server with internal SSD storage matches ideally the needs of small systems, supporting up to 250 channels of streaming and 1.6 TB raw storage (RAID-10 redundancy yields a net cache storage size of 800 GB).
Likewise, the largest systems supporting channel counts in the thousands can be implemented using the ARRIS XMS-Flex server with internal SSD storage that yields up-to 4 TB raw cache storage (2 TB net). Comparing the storage capacities of these two servers with the requirements reflected in the analysis above will show that these capacities include significant headroom for growth and variability.
Caching mechanisms are offered in both of the ARRIS products mentioned above, by way of the “auto-delete” function, which implements the LRU algorithm used in the analysis above, along with accommodations for preserving space for yet-unused preloaded ads.
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