Thursday, February 13, 2014

Thursday, April 14, 2005

An exhausted Charles Kennedy returned to the election campaign to launch a twenty page Liberal Democrat manifesto targeted at disaffected Labour voters, promising a fairer tax system and withdrawal from Iraq.

Entitled The Real Alternative the manifesto pledges to reduce the lowest rate of income tax, but increase the rate on those earning over £100,000 to 50%. The party would also scrap the unpopular local council tax in favour of a new local income tax. The manifesto also promises to remove hidden “stealth taxes”.

Under this system the party claims the poorest 15 million (25%) of people in Britain would be better off, and the middle 50% would be paying no extra tax.

The manifesto promised to scrap the controversial university tuition fees, increase services for pensioners and add £100 a month to the state pension, and train 21,000 new primary school teachers and 10,000 new police. A Lib Dem government would make eye and dental checks free, and reduce the cost of prescription medicine.

The Liberal Democrats were the only one of the three largest parliamentary parties to have consistently voted against the Iraq war, and the manifesto has promised an exit strategy with a phased withdrawal of Britain’s 8,000 troops still in the country.

“We reject a foreign policy based on ‘my ally right or wrong’,” Kennedy said. “And we say that war should always be a last resort.”

Kennedy, who became a father on Tuesday, admitted he’d had little sleep before the manifesto launch, and stumbled while answering questions on the proposed tax system.

Wednesday, February 23, 2005

On Monday, at 10.14 pm UTC, the Wikimedia server cluster experienced a total power failure, taking down Wikipedia, Wikinews, and all other Wikimedia websites.

The servers are housed in a colocation facility (colo) in Tampa, Florida, USA. They occupy two racks, with each rack receiving electricity from two independent supplies. However, both supplies have circuit-breakers in them, and both opened at the same time, leading to a total power failure. All computers immediately went down. It’s normal for fire safety regulations to prohibit uninterruptible power supplies in colos, with the colo providing its own UPS and generator instead. The circuit breakers were on the computer side of this emergency power system, so none of the computers continued to receive power to survive the breaker trip or shut down safely.

The actual reason why the circuit breakers tripped is currently unknown.

When power was restored, it was discovered that most of the MySQL databases that store the data which makes up Wikipedia et al had been corrupted. The main database and the four slaves had all damaged the data on their hard disk drives beyond the ability of the auto-correction to repair. Only one copy survived safely, on a machine that is used for report generation and maintenance tasks, which remained 31 hours backlogged while catching up after an unusually heavy update load during the previous week.

Volunteer Wikimedia engineers worked through the night rebuilding the databases from the sole good copy onto the other servers. The Wikipedia database is over 180Gb in size, making the copying process last 1.5 – 2 hours for every server it was performed upon.

Regular back-ups of the database of Wikipedia projects are maintained – the encyclopedia in its entirety was not at risk. The last database download was made on February 9; all edits since then could only have been laboriously rebuilt from logs and recovered from the damaged database requiring much more time and effort.

Limited read-only service was established late Tuesday afternoon, with editing becoming possible 24 hours after the power failure. Final repairs continue now, as well as upgrades to prevent similar issues in the future. Server-intensive features, such as categories and ‘watchlists’ that display recent changes to selected articles to registered users, remain disabled to ease the load on the recovering systems.

The process which led to the damage originated with the operating system, disk controllers, or hard drives failing to flush the data correctly.

If the power to a database server is cut mid-write, the database may be corrupted and unreadable, however the operating system, hardware, and software are designed to make this very unlikely. In a previous incident in 2004 power was also lost to a server but the database was undamaged.

To avoid such damage, each database server saves a copy of an edit to be applied to the database on a separate storage system before making the actual update to the database itself. This so-called ‘write-ahead logging’ should ensure that in the event of a system crash, the database can be rebuilt from a ‘last-good’ state by replaying the edits saved in the log.

Earlier this year popular blogging site LiveJournal suffered a similar power failure when another customer at their colocation facility pressed an Emergency Power Off button, intended for use only by firefighters. The company suffered database corruption similar to that seen at Wikimedia.

LiveJournal are now fitting UPS to their servers to ensure that they have time to shut down safely in the event of a power failure. Wikimedia was said to be investigating the possibility of fitting similar equipment at the time of this failure.

Several pundits have suggested that the use of another database, such as the proprietary database Oracle or the free PostgreSQL, would have avoided the database corruption seen at the server cluster. A post-mortem of the incident show the failure was in the operating system, or the hardware, or some combination of the two. LiveJournal, which also uses MySQL, reported similar database corruption after their power cut.

The Wikimedia foundation only allows the use of free software on its systems, and future versions of the Mediawiki software will support the PostgreSQL database.

Users are reminded that during times of system failure or excessive demand, they can still search Wikipedia using Google. The articles may be viewed using Google’s cache.

Thursday, October 5, 2006

The Independent Monitoring Commission has reported that the Provisional Irish Republican Army has undergone major changes within their military structure and shows that the IRA Army Council wants to put its military campaign behind it. The Commission consists of John Alderdice, a former Alliance Party leader; Joe Brosnan, former Secretary General of the Department of Justice, Republic of Ireland; John Grieve, former Deputy Assistant Commissioner of the Metropolitan Police and former head of the Metropolitan Police Anti-Terror Branch; and Dick Kerr, former Deputy Director of Central Intelligence Agency.

The report states the IRA no longer has the capacity to mount a military campaign anymore or return to one. The units that have been shut down were responsible for weapons-making, arms smuggling and training. The IRA decommissioned their arms last year.

The report also mentions that the IRA has also put its criminality beyond use and is “clamping down” on criminals within the organization, said Lord Alderdice, as he presented the report. He also added, “That doesn’t mean that criminal activity by all members has stopped but the leadership has made public statements and internal directions, investigated incidents of breach of the policy, even expelled some members and has emphasised the importance of ensuring that business affairs are conducted in a legitimate way.”

Finally, the report added that there is not enough evidence or intelligence to identify who killed Denis Donaldson, a British spy who infiltrated the IRA and Sinn Fein, before revealing his status as a spy.

However, the report added that splinter groups like the Real IRA (RIRA) and Continuity IRA (CIRA) are still threats and are still continuing their activity. The Real IRA was the group behind the deadly 1998 Omagh bombing. The Irish National Liberation Army (INLA) “was not capable of undertaking a sustained campaign [against the British State], nor does it aspire to” according to the report.

It is also noted the creation of two new organizations, Oglaigh na hEireann (Irish Gaelic for “Volunteers of Ireland” and is used by the Irish Defence Forces and the various IRAs.) and the Republican Defence Army. However, the groups are small dissident factions according to the report.

The report also added that the two loyalist paramilitaries, the Ulster Defence Association (UDA) and the Ulster Volunteer Force (UVF) are also beginning to move from violence but at slower pace and not at a grassroots level like the IRA. Another loyalist paramilitary, the Loyalist Volunteer Force

The report was received warmly by Irish Toaiseach Bertie Ahern and British Prime Minister Tony Blair. Ahern, said “These positive and clear-cut findings are of the utmost importance and significance. It is time to make decisions and for Northern Ireland to look to the future.”

“The IRA has done what we asked it to do, and while issues like policing remain to be solved, the door is now open to a final settlement, which is why the talks next week in Scotland are going to be so important.” said Tony Blair in a live statement.

In a surprising reaction, the notoriously hardline leader of the Democratic Unionist Party, Ian Paisley, also welcomed the report. He believes that his party’s pressure is working and if Sinn Fein signs up to policing there could be a deal. Paisley said, “If the police question is settled absolutely on a democratic basis and principle we would have come a long way along the road.”

Sinn Fein leader Gerry Adams said “The DUP don’t have anything other than very limited options. They will or will not participate in power-sharing arrangements. If they don’t participate they are condemning people here, but particularly their own constituents, to second class public services, run by second class fly-in, fly-out British ministers. All the DUP can do is to delay, is to attempt to slow down, but they can’t stop the process of changing.”