Memcache_hash_algorithm MTA option
Hashing memcache keys:
memcache_hash_algorithm (hash algorithm name)
New in MS 188.8.131.52. The
memcache_hash_algorithm MTA option controls what hash algorithm the MTA uses to optionally hash memcache keys. The value should be a hash algorithm supported by the MTA, one of MD2, MD4, MD5, SHA1, SHA256, SHA512, MD128, or MD160. SHA1 is the default. Note that the setting of this option must be the same across a deployment for successful coordination of memcache access.