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The Drobo storage device is a beautiful piece of technology. It is quite possibly the most user-friendly RAID (like) device on the market. With very little effort, you can have 3TB+ of failure-protected storage at your fingertips.

The problem with the Drobo is that in order to change its true data capacity on the fly and dynamically share it between multiple volumes, it must create “pretend” volumes in even-sized chunks. 2TB, 4TB, 8TB, and 16TB are the options currently available. This means that if you have 1.2 TB of actual space, the Drobo will tell your OS you have two or more TB.

This isn’t usually a problem except when you are running low on space (the Drobo is good to warn you when this happens) or when you are using the Drobo as a Time Machine storage device. Time Machine will continue filling up a drive until it is almost full.

In this post, I will provide you with a simple approach that will allow you to isolate your Time Machine data and give it room to grow in the future.

Preparation
If you have an empty Drobo, I suggest you format it with the largest size you feel comfortable with. Drobospace has a good article explaining the tradeoffs of formatting with a larger partition size.

Open Apple’s Disk Utility and click the drive icon (not its nested partition(s)) for your Drobo.
Next, click the Partition tab and examine your data volumes. You should see one or more named segments in the Volume Scheme section.

Most likely you have just one large volume here named Drobo. If you already have more than one volume, we will work with the largest one.

Making the Time Machine volume
If you already have a dedicated partition for Time Machine, you can skip to the next segment.
You should see a small resize handle in the lower right corner of the DLP. If not, you have journaling disabled. See the note on enabling journaling below and then return here.

Press the plus button below the Volume Scheme display to create a new volume. Name this volume something descriptive like Drobo Time Machine. Make sure to use the format “Mac OS Extended (Journaled)”.

Next, drag the volume size divider so your new Time Machine partition will have a much space as you can see yourself giving it down the road. I’ll create an 8TB partition and allocate a 4TB volume to Time Machine.

Finally, press the Apply button and let OSX create the new volume. Note that the Drobo may throw some free space warnings during this procedure. This is merely an effect of the OSX partitioning process. This procedure can take a long time depending on how full and how fragmented your Drobo is.

Give Time Machine only what it needs
Now that you have a volume just for Time Machine, you need to shrink it down to just the size you want TM to use for now.

If I have 1.6TB of usable space available on my Drobo, Time Machine will eventually gobble all that up if I leave the new 4TB TM volume as-is. The final step is to shrink that volume down to the right size for now and to expand it only when you are ready.

In Disk Utility, your new volume should have a small resize handle in the lower right corner. Grab that handle and move it up to shrink the volume. I want my Drobo to always have at least 1TB available for usable storage, so would shrink the TM volume down to 600GB.

Press apply and let the Mac resize the partition. Your Time Machine volume is now the perfect size for your backup needs. When you need to enlarge that volume in the future, just go back into Disk Utility and drag the volume handle down to the desired size.

A word on journaling
If the options to resize or split a partition are disabled in Disk Utility, your drive is either not formatted as Mac OS Extended or has journaling disabled. Having the wrong format type will require a volume reformat in order to continue. No journaling is a quick and simple fix:

Open Terminal.app
Run the command “diskutil enableJournal ‘/Volumes/My Drobo’”
Substitute “My Drobo” for the appropriate name.

Once you have completed the volume creation and resizing procedure, you probably won’t need to re-disable journaling. If you have a good reason to turn it back off, run the command “diskutil disableJournal ‘/Volumes/My Drobo’”.

There was a time several months ago when Apple Time Capsule devices required connected Drobos to have journaling disabled, but that problem has long since been fixed. Journaling should be enabled on all Mac OS Extended volumes unless you know what you are doing.

For more information, Apple provides an excellent KB article on the topic.

Summary
I hope this explainer proves useful to you if you find yourself in this situation. Please feel free to share your experience in the comments below.

A co-worker just pointed out a wonderful new tool for those who are frequently bothered by people who would rather ask you question instead of Googling it themselves:

LetMeGoogleThatForYou.com

Aside from being snarky and satisfying, it immediately struck me as a brilliant money maker. Perhaps even the best Google AdSense for Search referral generating tool since Mozilla put the Google search bar in every broswer it ships (Mozilla pulled down 75 million USD last year from your searches).

So, next time your cousin wants to know all about mesothelioma, send your response by way of LMGTFY and know that those guys are probably making a good chunk of the $40-$60 CPC the keyword “mesothelioma” commands.

Of course, I am in no way affiliated with LMGTFY. If they aren’t using their site as a Google search revenue generator, they’re missing out.

Update:
I’ve delved into their code and it would seem that they aren’t currently monetizing their searches. Perhaps it is better this way because it might break Google TOS to have their current gag auto-submit the search on behalf of the user.

Still, if you arrived on this page after searching for mesothelioma, I have my own ads that I use to help cover the cost of this and all my other sites. Just sayin’…

Update 2:
Good for them! The site is now sponsored by 37 Signals and they are bouncing traffic through Google AdSense for Search. Unfortunately, the referral version of the search results does not have the pretty look that traditional search results do. However, this does not degrade from the original thrust of the site which is to teach people that they, too, can use the Google.

I should preface this by saying that I normally do my home improvement shopping at Lowe’s. Historically, they have had better customer service and have a higher likelihood of carrying the oddball things I require for my more unusual projects.

This weekend I found myself going back and forth between Lowe’s and Home Depot as part of a home improvement project. Each time I visited Home Depot, I noticed an unnerving trend: abnormally attentive employees.

There were a lot of staff on hand and they kept stopping me and asking if I needed any help. At first I thought it was because I was one of the few people in the hardware store at 9am on a Sunday. Perhaps with my large graph paper pad, they assumed I was a mystery shopper. Maybe they just had a corporate pep rally so they could be expected to be truly helpful for a few days before going back to the norm.

I knew something was up when an employee helped me load several dozen pavers and a few bags of sand onto a cart, pushed them through checkout, and then helped me load it all into a truck. He even brought me a spare bag of sand after one tore a little bit.

I pointed out that his service was exemplary and that everyone was abnormally helpful for a big box hardware store. He confessed that they are running a new program called “Power Hour” from 8am to 8pm on weekends. During this time, they boost staff and have everyone make sure all of the customers are well attended to.

Home Depot may have just discovered the secret to weathering this economic downturn.

In a time when many companies are trying to lure in customers with lower prices, rebates, while cutting staff, at least company is spending their customer attraction dollar on its employees. In the home improvement market, they probably don’t have a lot of wiggle room for big sales and discounts. Making sure they have plenty of staff on hand who are eager to help will probably make a huge difference for them this season.

Unfortunately, it is a bit of a catch-22. They’ll have to rely on word of mouth for news of their improved service to spread. They can’t reasonably run an ad campaign shouting “We now have the customer service you want and deserve* (*Saturday and Sunday between 8am and 8pm)”. Still, this is probably a big expense for them and they are going out on a limb. If they don’t see a reasonable return, they may just drop it and go back to the way things used to be.

If you shop at a Home Depot this season and you experience exceptional customer service and attentiveness, let the staff know and maybe even let corporate HQ know.

With any luck, this is just the beginning of a revolution in big box home improvement customer service.

I’m working on PCI DSS (Payment Card Industry Data Security Standards) compliance for my company and one of the bigger hurdles we’re looking at is cryptographic key rotation. Our biggest concern is rotating keys for data stored in a DB. It seems we have two solutions and one theoretical option available:

1) 3rd party vendor
There are several companies offering appliances that are essentially crypto proxies which act as a middle man between data and logic.

2) Home brew
We’ve considered storing a key version number next to the encrypted column in the database. When one key is to be disused, a new one is generated and every value stored with the old key revision number is decrypted and re-encrypted with the new key. Meanwhile, all of the data is still accessible as the old key is not invalidated until all rows using that ID have been updated.

3) Theoretical crypto magic
I’m no cryptography expert, but it seems that there should be some means of generating several symmetric keys that result in the same encrypted data. Those keys could then be split into a shared/private pair where the system requesting the data only knows the shared portion; the private portion is a secret known only to the machine performing the encryption. The private key can be invalidated on demand and a new pair generated. No machine need ever store the complete key.

I don’t know if this last scenario is possible. If it’s not out there yet, this may be an interesting market for such a scheme. If there is a workable solution, this may be the ideal solution.

Are there other solutions I’ve overlooked? If you’ve implemented key rotation on DB data, what method did you use?

I’ve been a very happy customer with T-Mobile for over four years now. Ever since the beginning, I have been using various smartphones with their T-Zones service. T-Zones was originally intended to be a walled garden internet service where you pay $4.99 (when I signed up) each month for the privilege of being able to view T-Mobile’s WAP store. However, a salesperson clued me in that smartphones generally have the ability to change their network settings and with a couple of minor tweaks, you get full internet access at a much better rate than the $19.99 data plan they sell.

All this changed a couple of weeks ago. At first I thought it was just my phone, but after a while of not being able to access my maps and email, I called T-Mo up and found the real reason:

T-Mobile has disabled the hole that once allowed T-Zones users to access the full internet.

As an interesting aside, T-Mobile knows all about my hacked iPhone. In fact, they have people who are trained to deal with it on a limited basis. That means that they can also tell just how many hacked iPhone users there are out there with T-Zones. Perhaps some exec saw these very figures and assumed that at least one in four would stand to have their internet access prices quadrupled. However, I won’t be one of them.

I’m currently paying just under $60/mo all taxes and fees included for 1500 anytime minutes, 400 text messages, and (previously) unlimited internet access. If I bend to their new rules, that price will jump to nearly $80/mo. At that price, I might as well transfer over to AT&T and finally go legit.

By finally switching to AT&T, I get all of the following:

• No more jailbreaking
• Visual voicemail
• A warranty for my expensive phone
• Access to the latest hardware
• A more legit tax write off since I have a business license to develop software for the iPhone

But at what cost?

• Ending a four-year run with a carrier that I really like who generally respects long-term customers
• Opening a two-year contract with a carrier who sees long-term customers as a threat, so they milk every dollar they can out of long-term contracts
• Losing the warm fuzzy feeling of saying “screw you” to the man and using my phone on a different network

So what now?

Tomorrow is Apple’s press event. Due to the fact that Best Buy just started selling iPhones yesterday, I doubt there will be an iPhone update, but there is no sense in rushing out today to buy one. Also, I’m about to take a two week trip to Europe and I’ve found that aside from being generally more expensive domestically, AT&T is also $0.30 more per minute for international roaming calls where I will be.

So for now I sit tight. As soon as I return from my trip, I’ll be reluctantly terminating my account and shackling myself into a terrible contract with a terrible company–that is, if my beloved T-Mobile hasn’t changed their mind.

This is the first growing season in our new house. We have quite a bit of gardening space, so my wife and I will be attempting to fill that space with beautiful and edible plants.

In an attempt to keep this information handy for my own reference, I have decided to start a journal. I’ve made it public in the hopes that it someone might care to share some advice or learn from my inevitable mistakes.

The blog is called The Nu Leaf.

Thanks to everyone who supported the iPhone fund. I picked one up this morning and started pushing my macSaber code into the new form factor. As it turns out, however, I’ve been beaten to the punch by not one but two busy little coding bees. The first released app, iSaber is a good first attempt which has been widely attributed to me. The second is in active development and you should be hearing more about it soon. I have turned my MacSaber sources over to this dev and we should expect to see great things.

Contrary to what several blogs are saying, I cannot take credit for iSaber. Credit should be sent to the developer listed in the about portion of that application.

Good luck to everyone working on this project! I’m going to go back to remodeling my house. I’ll be gifting away this fancy iPhone and refunding the donations sent in. Don’t write me off, though. I’ll resume iPhone development around the time they release a 16-32 GB version. (that may come sooner than you think!)

I frequently use my wife’s Macbook because it always seems to be handy when my own laptop is in the other room. I gave myself a user account on the machine, but she started complaining that I’d often forget to switch back to her user account when I was done.

Being a lazy git, I sought out for a technical solution for this problem. The solution I came up with will automatically switch the active user to one of your choice each time the laptop is put to sleep (the lid is closed):

Step 1: Install SleepWatcher

SleepWatcher is a very simple daemon that adds new wakeup, sleep, and idle event triggers to your mac. At the time of this writing, SleepWatcher 2.0.4 can be downloaded here.

Open the .DMG file and install “sleepwatcher.pkg” then “SleepWatcher Startupitem.pkg”.

Step 2: Install SwitchUser

I have crafted a small command line application called SwitchUser to facilitate easily scriptable fast user switching.

Download and install SwitchUser 1.0.

Usage: switchuser

Step 3: Configure the Event

Open terminal and type the following line:

sudo nano /etc/rc.sleep

This will prompt you for your password. Once that is done, enter the following line at the end of the file:

switchuser 'target_user'

Remember to replace target_user with the short user name of the account you would like to switch to. If you don’t know that name, it can be found in /Users/.

To exit the editor, press CTRL + o then CTRL + x.

Step 4: Enjoy!

At this point, you should be able to close the lid of your laptop and the computer will automatically switch to the specified account.

Last year, I tested and passed the Zend PHP 4 certification. Once again, I have overcome great adversity and climbed the highest figurative mountains in order to qualify and quantify my bountiful PHP skills.

Ladies and gentlemen, I would like to announce my acceptance of Zend Certified Engineer: PHP 5.

Tune in this time next year for my PHP 6 hat trick.

I’ve heard a lot of people claim not to believe in luck. Allow me to demonstrate that this belief, while psychologically satisfying to some, is tantamount to disbelief in Pi or milkshakes.

Luck is not some sort of ethereal faith-based system of wish-granting priority. Luck is the result of a simple calculation and luckiness is the sum of a series of luck calculations.

The Formula

Luck = Benefit / sqrt(Probability)

The basic unit of luck measurement is under some debate, but for our discussion, we will refer to the unit as Л or “El.”

You can see the formula in action with my online luck calculator.

Benefit:

A numeric value with min and max centered about 0 and range set to an arbitrary scale (ex.: winning a free bagel = 0.8 and getting a lethal papercut on the giant novelty check handed to you by Ed McMahon = -99). For our purposes, the benefit scale ranges from -100 to 100, inclusive.

Note: The benefit value is subjectively determined value on a scale where -100 is the worst possible, 0 is neutral, and 100 is the best possible outcome. Refer to table 1a for some examples.

Probability:

A ratio of the number of times an event will happen over a number of attempts. This value will always range from zero to one, inclusive.

Formula In Action

Assuming your assessed benefit value of finding a $20 on the street is 5 and the odds of doing so are 1:400 (1/400 = 0.0025 = 0.25%), the formula would work out like this:
Л = 5/sqrt(0.0025)
Л = 5/0.05
Л = 200

Homework

Everyone loves story problems, so here’s one for you:
Lucy values her life more than anything in the world except for that of Mr. Turtle, her cat. She places the benefit of losing her life at -99. After a friend of a friend perished in a tragic futon accident, Lucy found out that the odds of such a thing happening to her are 1:4,473. Aside from the toilet, Lucy owns no furniture with a seat or table top higher than 18 inches because she feels this will ensure her safety. However, a fateful visit to Sears nullifies all of her protective efforts as she trips over a footstool and suffers a fatal concussion.

Calculate the Л for Lucy’s untimely death. Show your work.
Hint: Surprisingly, the value is negative.

Luck Calculator

Use this simple tool to quantify the luck for a particular event.

Benefit _{(range: -100 to 100)}

 

Probability _{(range: 0 to 1)}

 
OddsPercentRatio

Calculate My Luck!

Л:

 
_{Table 1a.: Example relative benefits}