:original_name: en-us_topic_0054235835.html

.. _en-us_topic_0054235835:

DCS Instance Specifications
===========================

For each single-node DCS Redis instance, the available memory is less than the total memory because some memory is reserved for system overhead, as shown in :ref:`Table 1 <en-us_topic_0054235835__table2399016819>`.

.. _en-us_topic_0054235835__table2399016819:

.. table:: **Table 1** Specifications of single-node DCS Redis 3.0 instances

   +-----------------+------------------+-----------------------------+---------------------------+
   | Total Memory    | Available Memory | Maximum Connections Allowed | Assured/Maximum Bandwidth |
   |                 |                  |                             |                           |
   | (GB)            | (GB)             | (Count)                     | (Mbit/s)                  |
   +=================+==================+=============================+===========================+
   | 2               | 1.5              | 10,000                      | 42/512                    |
   +-----------------+------------------+-----------------------------+---------------------------+
   | 4               | 3.2              | 10,000                      | 64/1,536                  |
   +-----------------+------------------+-----------------------------+---------------------------+
   | 8               | 6.8              | 10,000                      | 64/1,536                  |
   +-----------------+------------------+-----------------------------+---------------------------+
   | 16              | 13.6             | 10,000                      | 85/3,072                  |
   +-----------------+------------------+-----------------------------+---------------------------+
   | 32              | 27.2             | 10,000                      | 85/3,072                  |
   +-----------------+------------------+-----------------------------+---------------------------+
   | 64              | 58.2             | 12,000                      | 128/5,120                 |
   +-----------------+------------------+-----------------------------+---------------------------+

For each master/standby DCS Redis instance, the available memory is less than that of a single-node DCS Redis instance because some memory is reserved for data persistence, as shown in :ref:`Table 2 <en-us_topic_0054235835__table1540218117813>`. The available memory of a master/standby instance can be adjusted to support background tasks such as data persistence and master/standby synchronization.

.. _en-us_topic_0054235835__table1540218117813:

.. table:: **Table 2** Specifications of master/standby DCS Redis 3.0 instances

   +-----------------+------------------+-----------------------------+---------------------------+
   | Total Memory    | Available Memory | Maximum Connections Allowed | Assured/Maximum Bandwidth |
   |                 |                  |                             |                           |
   | (GB)            | (GB)             | (Count)                     | (Mbit/s)                  |
   +=================+==================+=============================+===========================+
   | 2               | 1.5              | 10,000                      | 42/512                    |
   +-----------------+------------------+-----------------------------+---------------------------+
   | 4               | 3.2              | 10,000                      | 64/1,536                  |
   +-----------------+------------------+-----------------------------+---------------------------+
   | 8               | 6.4              | 10,000                      | 64/1,536                  |
   +-----------------+------------------+-----------------------------+---------------------------+
   | 16              | 12.8             | 10,000                      | 85/3,072                  |
   +-----------------+------------------+-----------------------------+---------------------------+
   | 32              | 25.6             | 10,000                      | 85/3,072                  |
   +-----------------+------------------+-----------------------------+---------------------------+
   | 64              | 51.2             | 12,000                      | 128/5,120                 |
   +-----------------+------------------+-----------------------------+---------------------------+

In addition to larger memory, Proxy Cluster instances feature more connections allowed and higher bandwidth allowed than single-node and master/standby instances.

.. table:: **Table 3** Specifications of Proxy Cluster DCS Redis 3.0 instances

   +-----------------+------------------+-----------------------------+---------------------------+
   | Total Memory    | Available Memory | Maximum Connections Allowed | Assured/Maximum Bandwidth |
   |                 |                  |                             |                           |
   | (GB)            | (GB)             |                             | (Mbit/s)                  |
   +=================+==================+=============================+===========================+
   | 64              | 64               | 90,000                      | 600/5,120                 |
   +-----------------+------------------+-----------------------------+---------------------------+
   | 128             | 128              | 180,000                     | 600/5,120                 |
   +-----------------+------------------+-----------------------------+---------------------------+
   | 256             | 256              | 240,000                     | 600/5,120                 |
   +-----------------+------------------+-----------------------------+---------------------------+
   | 512             | 512              | 480,000                     | 600/5,120                 |
   +-----------------+------------------+-----------------------------+---------------------------+