Yearly Archives: 2015

Adding a Fusion Drive to the Mac Pro – Part XXXI

Mac Pro

A neat technology which preserves the Recovery Partition

For an index of all my Mac Pro articles, click here.

If you are looking for the highest disk speeds in OS X then the way to go is either:

  • A Samsung/Apple blade SSD in a PCIe slot – $800/TB with a limit of 1TB per PCIe slot. 1400MB/s.
  • Two 2.5″ SSDs on an Apricorn Duo card, RAID0, in a single PCIe slot – $400/TB with a limit of 2TB per PCIe slot. 650MB/s.
  • The Addonics mSATA card, RAID0, in a single PCIe slot – $400/TB with a limit of 4TB per PCIe slot. 700MB/s

I favor the last solution because of the maximum potential capacity, and to further speed things up from the stock 450MB/s I pair the SSDs on the Addonics in RAID0 using Disk Utility, which doubles the capacity (2 x 256GB SSDs become one 512GB drive with a 56% speed gain to 700MB/s).

But there is one snag with using RAID0 and it is that you lose Apple’s invaluable Recovery Partition technology.

Apple states the benefits of a Recovery partition are (my emphasis – that’s the option I really want):

  • OS X Recovery includes a built in set of utilities as part of the Recovery System. You can use OS X Recovery to do the following:
    • Restore your Mac from a Time Machine backup.
    • Verify and repair connected drives using Disk Utility.
    • Check your Internet connection or get help online using Safari.
    • Install or reinstall OS X.

The complete Apple advisory is here.

Think of the Recovery Partition as the last resort when all else is lost and as one more invisible sentinel looking out for your interests.

I contacted Mike Bombich, the estimable author of CarbonCopyCloner – who else on earth could know more about this sort of thing? – and got the following explanation as to why I could not see a Recovery partition on my RAID0 paired mSATA SSDs:

Mike references this article on setting up of Fusion drives with two disks after the Recovery partition has been established. Adopting a Fusion Drive solution sidesteps the disappearance of the Recovery Partition in RAID0, albeit at the sacrifice of some speed. Read on.

You can create a Fusion Drive from any two internal disks; Apple cautions against doing this with external drives. Apple uses a largish SSD (larger than that found in hybrid drives) and a big HDD. I’m using two SSDs which act as my daily OS/Apps backup and that is where the Recovery Partition will be created before the rest of the drive pair is recreated as a single Fusion Drive. The Recovery Partition is invisible to Finder but can be seen as a boot drive if you do a Cmd-R or Option-boot start of your Mac Pro. The linked Apple document, above, tells you which version of OS X is required.

Set forth below – long and geeky – is the process of combining two mSATA SSDs mounted on the Addonics PCIe card into one Fusion Drive with a Recovery Partition. Without Mike Bombich’s help none of what follows could have been done.

Step 1 – Prepare two of the drives on the Addonics:

Format each drive in Disk Utility as OS X (journaled) – that’s 2 x 256GB drives in my case.

Step 2 – Install OS X on one of those two drives:

You cannot create a Recovery Partition on the drive until OS X is installed.

Step 3 – Create the Recovery partition on the OS X drive:

You use CarbonCopyCloner to do that; it create an invisible partition in Yosemite some 790MB in size in Yosemite.

Step 4 – Note the file names:

Go into Applications->Utilities->Terminal and note the drive names:

The SSD with OS X and the Recovery Partition is shown in the red rectangle (‘mSATA_BAK1’). One partition on that drive will become part of the Fusion Drive. The one in green is the second SSD, all of which will become part of the Fusion Drive (‘mSATA_BAK2’). Fusion Drive component drives do not need to be like sized to avoid space wastage, unlike with RAID0 where the size of the smallest drive dictates total space.

Step 5 – Create the Fusion Drive:

This process concatenates (strings together in sequential order) the two large open spaces on the two mSATA SSDs. It’s key to follow the instruction set in Terminal below (blue rectangle) – we are concatenating only the open partition of the first SSD (red, above) with the whole of the second drive (green above). The blue rectangle below is all you type, then hit enter. If you simply combine both drives the Recovery Partition will be erased (‘disk2 disk3’ instead of ‘disk2s disk3’):

Do NOT exit Terminal. You need that cryptic drive ID (cyan rectangle) in the following instruction.

Step 6 – Create the Fusion Drive volume:

Type the instruction in the cyan box and hit enter; it’s best to copy (Cmd-C) and paste (Cmd-V) the UUID to avoid typos. Hit enter:

Step 7 – Check in Drive Utility:

Go into Drive Utility and you will see:

In the above I have renamed the Fusion Drive to ‘m_SATA Backup’ for clarity.

Step 8 – Check on the Recovery Partition:

Restart while holding down the option key. You should see the Recovery ‘disk’. Click on that and you will enter OS X Disk Recovery Utilities which offer all the disaster recovery choices shown in the introduction to this article:

Step 9 – Add a nice icon:

My Desktop looks like this – before doing a full clone of the boot to the backup drive:

  • mSata Boot is a RAID0 pair of mSATA SSDs on the Addonics PCIe
  • HacProHD and BackupHD are two large WD 2TB Red spinning HDDs for data and data backup, respectively
  • TimeMachine is the (restorable) 3TB WD Red HDD with sequential backups
  • mSATA Backup is the Fusion Drive with the Recovery Partition created in this article.

Step 10 – Backup:

Boot into your usual boot drive and back it up using CarbonCopyCloner to the Fusion drive.

You are done.

Speed tests:

The Fusion Drive is a concatenation of two drives – they are strung end-to-end. This is unlike a RAID0 array where the two drives are written to in parallel – simultaneously – which results in far higher drive speeds than with concatenation. As speed is not of the essence in a backup drive, the lower performance is no big deal – compare to the 700MB/s I get with the RAID0 pair:


Speed of a dual SSD Fusion Drive.

Photographs – 10 years

10th Anniversary, Photographs

Ten years and ten million readers.

I started writing here ten years ago today, ten million hits ago. When titling this journal I had three topics in mind.

‘Photographers’ would address pieces about photographers whose work I like and which in some way influenced my way of seeing. The most influential by far is Henri Cartier-Bresson whose work I first chanced upon in the public library in London, when I was 10 years old. It immediately captivated and does so to this day.

‘Photography’ would address technical aspects of the craft, including both cameras and processing hardware. At the start of the last decade the latter had come to irreversibly mean no more film or chemical darkroom, but rather a digital image and a desktop computer. And thank goodness for that. The amount of time spent on the production process has never been lower. Just download, click a couple of things in LR then push Print. Done.

But the most important of those three aspects of the image captured in the title of this journal is ‘Photographs’ and that means photographs taken by me. This journal is like a television set – if you don’t like the content, switch channels. I have dozens of large prints of my snaps on the walls here, their daily examination reminding me what an absolute blast I have taking pictures. I enjoy my ‘channel’.

My primary interest is street photography and it does not hurt that America’s most photogenic city, San Francisco, is at my doorstep. To illustrate my street work of the past decade I have selected just two rolls’ worth of ‘film’. 72 snaps. Hundreds, maybe thousands, have already appeared here.

What HC-B taught me at the tender age of 10 is that good street photography is much more than just pressing the button at the right moment. Sure, you cannot produce a good image from a poorly timed snap. But the other key attributes abundantly found in HC-B’s street work are a sense of drama, enhanced by an absence of clutter. Accomplishing the latter in street snaps is one of the more challenging aspects of our crowded urban environment. Drama is not an issue. There is a lot to go around in the eternal human comedy.

The other attribute which pervades my snaps is something of which the master’s work is totally devoid. Humor. The sheer pleasure, joy and frequent hilarity the streets of a great American city bring to the eye are the sublimest of pleasures. A life without humor is no life at all.

And there’s one other variable, one about which HC-B was clueless. Color. I have little interest in monochrome snaps, which mostly say to me that the photographer was trying to make a silk purse out of a sow’s ear. We live, as Eliot Porter reminds us, in a world of color.

A quick peek at the bottom of this journal’s page will show how those three major categories addressed here were favored over the past decade:


10 years of snaps and writing.

If the ‘Photographers’ category is light, it’s no surprise. There are few out there of note.

The decade since the first entry here on June 15, 2005 has seen this journal bring me tremendous satisfaction, lasting friendships, the joy of both learning and teaching and a wonderful outlet for whatever was in my mind on any one of those 3,000 plus days. If there have been frustrations – resulting solely from trolls who will never contribute anything useful to civilization – then these were quickly forgotten, courtesy of the Delete key and secure in the knowledge that no negative person has ever accomplished anything of value.

I hope you enjoy the slideshow I have put together of those 72 images. Every time I gaze at these snaps I enjoy perfect recall of how each was made and remember the thrill of seeing the moment come together. What other hobby can compare?

Some were sheer automated reaction as a situation presented itself, like the bike-taxi rider (#1), the selfie couple (#9), the joyous street scene (#42), the lady with the raised knee (#64), or Superman entering his car (#65). Others were carefully premeditated, like the lone snapper below the Golden Gate Bridge (#3), the solitary, seated figure outside the CJM (#13) or the lady in the Balenciaga outfit (#54). Three were actually posed – the bell ringer (#7), the unhappy pair in The Saloon (#22) on Grant Street and the glass treader in the Castro (#32). Many were simply magic, like the little boy in the window (#34), the sack carrier (#45), the man with the finger (#47) or the child chasing the bubble (#49) – these last four being snapped in the Mission District, my favorite part of the city.

The flamenco music accompanying the slide show is by Nova Menco, full of that same joie de vivre I experience on the street. Where EXIF data is spotty that’s because the related image was made with an ancient MF Nikkor before I had added a CPU to properly record everything. The occasional hiccup in inter-slide fades is thanks to Adobe’s Lightroom 6.

To view those ‘two rolls’, click the image below. All these snaps were taken in San Francisco. The running time is six minutes, or 5 seconds a slide.

[iframe src=”https://player.vimeo.com/video/132615344″ width=”1000″ height=”563″ frameborder=”0″ webkitallowfullscreen mozallowfullscreen allowfullscreen]

For those of you who have been around for the journey, some 4,000 readers daily, I extend a hearty thanks.