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Mon, 22 May 2006
Logical block addressing offsets with ESX Server
Bob, the Lone Sysadmin has a nice primer on logical block addressing offsets that make ESX Server work better with EMC CLARiiON storage.
Computers, being what they are, like things that come in powers of 2. Storage arrays, being computers, like getting I/O requests in sizes that are powers of 2. Storage arrays stripe the data internally in sizes that are powers of 2. 63 is not a power of 2, and because a PC uses 63 sectors per track it causes the structures the PC uses to be misaligned with the structures the array uses. And that results in more work for the array, because each I/O request from the PC ends up straddling the stripes on the array, so it has to read twice as much stuff in (two stripes instead of one).
A quick search of the VMTN Forums for LBA shows that this is a very well-known knob you need to adjust, although it really only impacts you at high levels of throughput.
posted by jtroyer at: 18:12 | | | permanent link
Fri, 19 May 2006
The Value of Virtual Machines in Development
He lists three other scenarios, all of which should be familiar to most developers.
posted by jtroyer at: 17:11 | | | permanent link
Wed, 17 May 2006
Virtualization is the Coolest thing, pt 2
CTO Tallsails continues his story about virtualizing 18 servers on a Sun Galaxy 4200 with the technical details. He talks about picking software, hardware, storage, P2V, torture tests, and the like, but here's the payoff:
posted by jtroyer at: 13:17 | | | permanent link
The Countdown Begins
There are fewer than 10 days left until the Ultimate Virtual Appliance Challenge deadline: May 26, 2006. It's not too late to assemble the world's most innovative virtual appliance. We're seeing lots of good entries, but you can still enter, and I guarantee that your chances are better than the state lottery. I'm serious that it's not too late -- most of the appliances are being crafted by combining open source components and packages and operating systems in clever ways. Fit & finish are important to the Challenge, but unique value and innovative use of virtualization are 75% of the judging criteria.
So if you still have that great idea kicking around that makes virtual better than real, 9 days is more than enough to pull it together. Your car doesn't need to be washed this weekend. The beach will wait. Your kid's volleyball game -- OK, go to that, but then come home and get back to work on your appliance. See the Challenge submission instructions for more information.
Our ftp servers are standing by to receive your files by May 26. You'll be doing yourself a favor if you submit it before Friday the 26th, since you'll be fighting everyone else uploading at the same time, but I don't want to nag, so just make sure you give yourself enough time. If uploading a gigabyte virtual appliance file is going to interfere with uploading your latest lipsync video to YouTube, you can burn it on a DVD and overnight it to us.
p.s. the deadline to submit presentation proposals for VMworld 2006 was May 15. I haven't talked to that team, but I'd bet if you submitted one, they'd still read it. If you have any ideas for labs, or if there were any from last year you want repeated, send them my way and I'll make sure they get to the right folks.
posted by jtroyer at: 11:59 | | | permanent link
Tue, 02 May 2006
Submit your entries to the Virtual Appliance Challenge
If you haven't pre-registered, you can still enter the contest. Just go to the instructions and start from there. Well, start by building your appliance. It's not too late!
Our ftp servers are standing by for the mad rush at the deadline on midnight, May 26. You don't win any points by entering early, but I would bet you'll reduce your stress level by not procrastinating. And we all need to reduce our stress level, right?
All the entries will be published in early June in VMTN's Virtual Appliances directory.
posted by jtroyer at: 18:37 | | | permanent link