Today we have made a number of changes Onza and Yali.

• Each user can now read their own web logs, which are stored in /home/user/www/log
• PHP scripts no longer need the execute bit set to run
• All scripts in cgi-bin directories have been moved to /home/user/cgi-bin to conform with Apache’s security recommendations

We hope that these changes will make it easier for people to run and debug their code.

A couple of weeks ago, Apple unveiled the latest incarnation of the Mac mini.  Naturally, we dashed out to buy a few to see if they’re going to be any good as servers.  Externally, this is the biggest revision of the Mac Mini yet, with a thinner all-aluminium case.  We always get a bit nervous when Apple unveil a new Mac mini as there’s a chance that they’ll ruin the formula that make it such a great server in the name of creating a fun toy for your living room.

The most noticeable change, aside from the new case, is the removal of the power brick.  The old minis relied on an external power supply that really was the size and shape of a brick.  Getting rid of these will make racking them a lot simpler, as well as saving space.  We reckon we should be able to get 24 machines and 3 APC Masterswitches into 6U of rackspace.  The C7 power connectors should be more secure too.

The next thing that we approve of is the easily accessible RAM slots.  Traditionally, Apple have charged silly money for ordering machines with extra RAM, so we’ve always done the upgrades ourselves.  Upgrading the old minis was a real pain, requiring the cover to be prised off with putty knives, so this is a welcome change.

The most important factor for us, and the thing that lead us to use the original PPC minis, is power consumption, as power is the primary cost when hosting a machine.  There’s good news here too: according to our power meter, power consumption is down from 26W to 12W (idle) and 44W to 40W (max).

Unfortunately, the reduction in hosting cost is offset somewhat by they usual price hike for the newer hardware, but we’re pleased to see that Apple have retained the “server” version of the mini with two hard drives, allowing us to continue to offer machines running software RAID.

Overall, the new Macs seem like a decent improvement on the old ones for our purposes.  Apple make a fuss over the great variety of ports now available on the back of the new mini, but inexplicably they haven’t provided the one thing we’d want: a good old-fashioned serial port.

We still need to make the minis work with our custom net-booting bootloader, but once that is done, we’ll be offering them as dedicated servers.

It’s been nearly six years since we first launched our Virtual Dedicated Servers.  At the time, the choice for virtualisation technology was easy: User Mode Linux.  Initially, UML was a well supported option, with UML patches being incorporated into the Linux kernel.  Over time, we’ve been following the development of other technologies such as Xen and KVM and at the end of last year we concluded that we should make the switch to Xen.

Getting Xen working reliably with our server management code has taken somewhat longer than expected, but we’re pleased to announce the the service is now live.

We’ve also taken the opportunity to roll out new hardware, allowing us to offer substantially higher specced VDSs for the same prices, with our base machine now coming in at 256MB RAM, 20GB, and an increased bandwidth allowance of 100GB/month for £15/month including VAT – less if you pay annually.

Although we’ve changed the virtualisation platform, we’ve retained the other key features of our virtual servers including:

Host servers with hot-swap hardware RAID.  Although these are significantly more expensive, we figure that reliability is something that can be shared particularly effectively through virtualisation: over the years, our VDS host servers have seen a fair few disk failures and replacements, but typically our customers don’t even know that they’ve happened.

Nightly backup to other host servers, allowing us to resume service quickly in the event of a serious hardware failure.

As part of the upgrade, we’ve also deployed a new approach to providing disk images which offers significantly better IO performance than the standard approach of storing the VDS filesystem as a file on the host filesystem.

The new VDSs are available now, and we’ll be contacting all existing customers in the near future to arrange migration to the new platform.