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Enhanced Memcached Statistics
Membrain provides visibility into the state of Memcached/NoSQL servers, including statistics on:
Hot keys;
Hot clients;
DRAM and flash space utilization;
DRAM and flash access and miss rates;
DRAM and flash eviction rates;
Processor utilization;
Network and flash I/O utilization; and
Read and write response times.
Membrain provides access to Memcached server statistics via server logs and automated
charting utilities in Ganglia and Nagios.
Hot-key and hot-client statistical data provides sorted lists of the most frequently used keys
and the most active clients. This data is crucial for identifying client and cluster configuration
problems. Membrain implements an embedded user-mode analyzer for maximum performance.
Putting It All Together: Membrain Use Cases
This section shows how the extended capabilities of Membrain solve customer problems in
typical Memcached/NoSQL deployments through:
Reducing TCO Through Consolidation;
Industry-Leading Data and Service Availability.
Reducing TCO through Consolidation
Figure 8 shows the Consolidation and Reduction in Total Cost of Ownership (TCO) which is
realized in a 2-TB Memcached/NoSQL customer scenario. Consolidation provides a reduction
in the number of servers from 32 to 4, coupled with a reduction in power consumption from 18
kW to 2.5 kW. TCO is reduced by 50% over three years with the consolidated SanDisk solution.
Figure 9: Consolidation and TCO Reduction with Membrain
The TCO comparison includes initial capital expense, maintenance, and the cost of “rack, power,
and pipe” over a three-year interval. The “rack, power, and pipe” estimates use rates from
a typical Web hosting site. The TCO computation only includes tangible costs; it does NOT
include any cost savings due to the simplified administration for an 8:1 server reduction.
SanDisk delivers
50
%+
reduction in TCO
3 year TCO for 2TB
memcached workload
OpEx: $610,000
CapEx: 32 servers
OpEx: $282,000
CapEx: 4 SanDisk-powered servers
vs
