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pypm install gocept.zeoraid

How to install gocept.zeoraid

  1. Download and install ActivePython
  2. Open Command Prompt
  3. Type pypm install gocept.zeoraid
 Python 2.7Python 3.2Python 3.3
Windows (32-bit)
1.0b8 Available View build log
1.0b7 Available View build log
Windows (64-bit)
1.0b8 Available View build log
1.0b7 Available View build log
Mac OS X (10.5+)
1.0b8 Available View build log
1.0b7 Available View build log
Linux (32-bit)
1.0b8 Available View build log
1.0b7 Available View build log
Linux (64-bit)
1.0b8 Available View build log
1.0b7 Available View build log
 
License
ZPL 2.1
Lastest release
version 1.0b8 on Jan 5th, 2011

The ZEORaid storage is a storage intended to make ZEO installations more reliable by applying techniques as used in hard disk RAID solutions.

The implementation is intended to make use of as much existing infrastructure as possible and provide a seamless and simple experience on setting up a reliable ZEO server infrastructure.

Note: We use typical RAID terms to describe the behaviour of this system.

The RAID storage

The ZEORaid storage is a proxy storage that works like a RAID controller by creating a redundant array of ZEO servers. The redundancy is similar to RAID level 1.

Therefore, up to N-1 out of N ZEO servers can fail without interrupting the service.

It is intended that any storage can be used as a backend storage for a RAID storage, although typically a ClientStorage will be the direct backend.

The ZEORaid server

The RAID storage could (in theory) be used directly from a Zope server. However, to achieve real reliability, the RAID has to run as a storage for multiple Zope servers, like a normal ZEO setup does.

For this, we leverage the normal ZEO server implementation and simply use a RAID storage instead of a FileStorage. To achieve full reliability, you can install multiple ZEORaid servers with identical configuration:

[ Zope 1 ]                      [ ZEORaid 1 ]                  [ ZEO 1 ]
[ Zope 2 ]    talk to all -->   [ ZEORaid 2 ]   talk to all -> [ ZEO 2 ]

System Message: ERROR/3 (<string>, line 40)

Inconsistent literal block quoting.

... ... ... [ Zope N] [ ZEORaid N ] [ ZEO N ]

ZEO RAID servers maintain a list of all the optimal, degraded and recovering storages and provide an extended Storage API to allow querying the RAID status and disabling and recovering storages at runtime.

Development

Discussion via mailing list happens on zodb-dev@zope.org. For subscriptions visit http://mail.zope.org/.

A bug tracker is available at launchpad: https://bugs.launchpad.net/gocept.zeoraid/

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Last updated Jan 5th, 2011

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