Glo Networks Technical Blog (Glo Blog)

Glo Networks team sharing their technical experiences and thoughts.

OS X 10.7 (Lion) FileVault Overhead

2011 August 17 – 9:45 am

Always used FileVault on OS X as a sort of best practice rule. In Lion they’ve changed it from just securing your userspace to full disk encryption. All very nice until I wondered why my MacBook Pro wasn’t feeling ‘smooth’ or as ‘quick’ as it was. A few tests showed the SSD as running way under par!

There’s a Corsair Force 3 240Gb SSD in the machine that was running in the 400MB/s range before the I’d loaded the machine with my Apps / Data and config etc. It’s running a 2Ghz i7 in a macBook Pro from early 2011 so should be able to cope!  So I took some rough benchmarks using Disk Speed Test from the App Store.

With FileVault Without FileVault

That’s roughly a 70% speed decrease ! Shall not be using FileVault anymore.

Disclaimer : something else might have been causing this speed funny but it certainly doesn’t look like it !


VMWares Memory vTax

2011 August 4 – 4:35 pm

In the virtualisation game VMWare are big competitors.  They’ve been selling virtual machine software since 1999 and their products are the ‘go to’ virtualisation tools for many businesses (not us at Glo). But since announcing their most recent price structure changes VMWare have experienced a huge amount of criticism from their customer base.

And we can understand why. The basic gist of the change is a cap on the RAM you can apply to your virtual machines per license. Formally licenses were required on a per processor basis alone, now, if you reach the virtual RAM cap for the number of processor’s you have licensed, you will require extra licenses to cover any additional RAM. This increase caused the change to be dubbed the ‘Memory vTax’.

When VMWare first announced this pricing change the memory allowance per license were rather low, meaning (obviously depending on the configuration of the virtual machines) some VMWare customers were looking at their licensing costs being several times what the old pricing structure would have cost. Reacting to the complaints of their customers VMWare have now raised the cap, which should keep the license costs to a more reasonable level for most customers.

Here at GloNetworks we’ve always tended towards the Microsoft Virtualization software ‘Hyper-V’ over the VMWare options, and right now we’re more confident than ever in our choice. It could be argued that WMWares virtualisation software is more ‘feature-full’ however we feel that Hyper-V’s pricing has always been more appropriate for us and our customers’ requirements. And since Microsoft have appeared to confirm they have no plans to use a similar ‘Memory Tax’ in its next Hyper-V product (Windows Server ‘8’ Hyper-V) we’re sure this will continue to be the case.