Making Magento run faster configuring Redis as Back-end

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Making Magento run faster with Redis as Back-End
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The Caching Method Currently Employed in Magento

• Magento uses the default two level caching of the
  Zend framework, a fast cache and a slow one as
  configured in the file Local.xml
• The fast cache is configured to APC/Memcache,
  whereas the slow one is file system based

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Advantages and Disadvantages of Default Cache

• Magento stores its cache entries in the file
  system. This model does have an advantage. We
  dont need any additional software to keep it
  running
• The default model, however, proves to be more of
  a disadvantage than an advantage. This is because
  Magento stores its cache entries in the file
  system in the /var/cache folder. This is fine as
  long as the traffic is minimal. The Magento cache
  is also organized by tags, this means you have
  cache entries which belongs to a cache group
• Once the traffic increases, the number of cache
  entries in the file system increase, and reading
  and writing to the file system becomes slower and
  slower
• Magento clears cache entries by tag. A typical
  scenario is one where, after placing an order or
  saving a product, it makes sure that the block
  caches are updated on the store. While clearing
  entries by cache tag, Magento has to open each
  file to check if the cache entry belongs to the
  cache group
• Consider a Magento store with 1000 products, it
  would have a cache size of 50 MB. There would be
  at least 3500 entries(individual files) and the
  process would be very slow and certainly not
  feasible in the long run

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2 Ways of Achieving Better Performance in this
Model

• Use SSDs( Solid State Drives) instead of normal
  hard drives
• Put the /var/cache directory in TMPFs

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Advantages of Configuring Redis as Back-End

• Very fast cache back end with excellent support
  for cache tags, the slower file system cache is
  ruled out
• Highly recommended in multi-server environments
  where you have more than one web server
• It has been tested on high traffic Magento stores
  with more than 500,000 visitors / day and the
  performance has been great

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Requirements for a Working Redis Back-End

• Redis must be installed on the server.
• PHP Extension PHPRedis must be installed.
• Magento extension Cm_Cache_Backend_Redis must
  be installed.

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Installation and Configuration For Redis
Initial Steps

• Install redis(2.4 required)
• Install phpredis
• Install the magento extension Cm_Cache_Backend_Re
  dis
• Edit your app/etc/local.xml. Follow screenshot
  below

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Installation and Configuration of Redis Final
Step

• Restart the PHP process and it will make sure
  the cache is being stored in Redis as shown below
  

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