ext4 disable journal

At one high loaded web project I needed a very fast file system. I decided to use Ext4 with disabled journal (As a google:))).

# Create ext4 fs on /dev/sda10 disk
mkfs.ext4 /dev/sda10

# Enable writeback mode. This mode will typically provide the best ext4 performance.
tune2fs -o journal_data_writeback /dev/sda10

# Delete has_journal option
tune2fs -O ^has_journal /dev/sda10

# Required fsck
e2fsck -f /dev/sda10

# Check fs options
dumpe2fs /dev/sda10 |more

For more performance add fstab opions: data=writeback,noatime,nodiratime
i.e:
/dev/sda10 /opt ext4 defaults,data=writeback,noatime,nodiratime 0 0

Tested at non-boot partition ;)

Key-Value Storages

memcached - distributed memory object caching system ( http://memcached.org/ )
memcachedb - distributed key-value storage ( http://memcachedb.org/ )
redis - A persistent key-value database with built-in net interface written in ANSI-C for Posix systems ( http://code.google.com/p/redis/ )
MongoDB - scalable, high-performance, open source, schema-free, document-oriented database. Written in C++ ( http://www.mongodb.org )
CouchDB - doc. oriented, written in Erlang ( http://couchdb.apache.org/ )

Riak - NoSQL, decentralized ( http://riak.basho.com/ )

RINGO - distributed key-value storage for immutable data, written in Erlang ( http://github.com/tuulos/ringo )

Dynamo - Amazon’s Highly Available Key-value Store ( http://www.allthingsdistributed.com/2007/10/amazons_dynamo.html )

Cassandra - highly scalable, eventually consistent, distributed, structured key-value store. "Dynamo 2.0" ( http://incubator.apache.org/cassandra/ )

Scalaris - scalable, transactional, distributed key-value store ( http://code.google.com/p/scalaris/ )

P.S. Storages overview from Richard Jones http://www.metabrew.com/article/anti-rdbms-a-list-of-distributed-key-value-stores