Caution: El Capitan May Cause RAID Problems

Posted on by Larry

With the release of Mac OS X 10.11 (El Capitan), Disk Utility has changed so that it no longer creates RAID 0 or RAID 1 RAIDs. There are also issues with properly monitoring drive health. (Thanks to Larry O’Connor at OWC for bringing this to my attention.)

DEFINITION: A RAID is a collection of separate hard disks that are combined to act as a single drive, providing greater storage and faster speeds. RAIDs are configured into different levels: 0, 1, 10, 5, 6 and 50. (This article describes RAID levels in more detail.) RAIDs can be created using software or hardware. In all cases, a RAID requires at least two separate hard drives; the most popular systems use either 4 drives or eight, all built into a single enclosure.


This problem is significant, but very specific:

What no longer works is the ability to use Disk Utility to create, or re-create, any RAIDs in Mac OS X 10.11 (El Capitan). This means that you will need to use other software to create a RAID.

Also, Disk Utility no longer monitors the health of your hard drives, nor does it allow you to repair permissions.


In versions of the Mac OS prior to 10.11, when Disk Utility was started, a RAID option existed in the menu bar at the top.

This allowed us to create new RAIDs in one of three formats:

Additionally, the bottom of Disk Utility displayed the SMART status of a drive, which was designed to provide an early warning of drive failure.

These features no longer exist in the latest version of Disk Utility, shipped with El Capitan.


After upgrading to El Capitan, Disk Utility has an entirely different look. The entire RAID submenu is gone, as is the ability to check the SMART status of the drive.

NOTE: According to Larry O’Connor, SMART diagnosis was too far “after the fact,” to actually prevent data loss. Watch his interview, at the bottom, to learn more.

The ability to repair permissions is also gone.

And repairing a hard disk is simplified, as well; though twirling down Show Details does provide more information on the status of First Aid operations.

Another new thing I noticed when Disk Repair was running was that all other applications and window actions were paused.


If you have a hardware RAID, this is not an issue.

If you have a software RAID, or plan to create them in the future, you will need to use other software than Disk Utility to initialize the RAID.

A program that I use personally is SoftRAID – – developed by SoftRAID. I’ve been using it on multiple systems to create RAIDs, monitor RAIDs and support RAIDs. It has never caused me a problem and I recommend it highly.


Watch this interview that I did last week with Larry O’Connor, CEO of OWC, discussing this problem in more detail, and outlining additional software options.

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23 Responses to Caution: El Capitan May Cause RAID Problems

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  1. Tom Wolsky says:

    The RAID function is still available in the OS. A RAID can be created using a Terminal command line. I suspect RAID will be reintroduced to Disk Utility before long.

    • Larry says:


      Thanks. Terminal is one area of the OS where I don’t play. I agree, it would be very helpful if the the ability to create RAIDs is added back to Disk Utility.


  2. My Lacie 2Big USB 3.0 RAID was completely unable to mount under El Crapitan on my Early 2009 Mac Pro.

    No amount of reinstalling drivers or other remedies worked. So I had to back-grade to Yosemite.

    Apple just doesn’t seem to “get it” that – when they take functionality away and force users to do things the way they see fit – they put our businesses in jeopardy.

    We need our computers to run reliably to get work out the door. Apple said El Crapitan wasn’t any big deal and wouldn’t disrupt anything. They lied.

    We don’t need Apple to reinvent things and, in the process, make our work harder to do.

  3. Fred H. Nesbitt Jr says:

    It seems like Apple is purposely making their OS less & less user friendly…at the Apple store, if you’re not some kid with your parents buying an iPhone or iPad, the staff can be quite rude.

  4. says:

    As of now, SoftRaid 5.1 which can work with 10.11.1 is not available yet. Their website still says they will ship today …

  5. Its very SAD that Apple has become so user unfriendly and so profit-only aware. It seems like everything they do goes against the good-will and great OS design they used to have. The music player is a good example – what garbage – nearly impossible to use without disentangling yourself from ads at ever move. By not even warning users about the RAID and permissions issues before having us upload a new OS, the Apple management just demonstrates that THEIR heads are in the cloud – that they have no feeling or real connection with their current Mac Users. Their changes in the OS system User Interface since 10.6.8 have all been downhill, making it harder to use.

  6. Denis says:

    I’ve lost my raid array after 10.11.2 update. Something went wrong and my 6Tb of data become unavailable to me. To say that I was frustrated.. I have latest Mac Pro, and the performance of it after each update degrades significant. Whey I’ve bought it with Yosemite, it was a pretty damn fast machine, now.. I can’t even access my files, or check what’s wrong with my drive, fix permissions etc. hopefully I have a friend with 10.9, on his Mac book disk utility ident my drive, and tried to fix things, 10.11.2 – didn’t. Now I’m backing up all my 6Tb to Amazon cloud, then I will downgrade to 10.10 or 10.9

    • Larry says:


      I’m sorry for your problems.

      You don’t need to go all the way back to 10.9, all you need to do is go back to 10.10. Or, purchase a new hardware RAID, rather than one that is configured using Disk Utility.


      • Steve Joseph says:

        “or purchase a new hardware raid” – I’m not sure that’s quite the answer, at least not for some users. I recently had to return a ProRaid Dual Enclosure that did not play well with my 2009 Mac Pro even though it was supposed to. It wasn’t until recently reading reviews of even more enclosures I started to even consider El Capitan as an actual culprit.

        I also wonder if my architecture is just too old? And what if, just what if external RAID support is something Apple has on their kill list like the optical drive but manufacturer’s just don’t know it yet? Creating a RAID and managing it is not an “average Apple user” flow. Not at all. So I can think of many reasons why one would want to hide it but removing it has to be for a reason and that’s the question I haven’t seen asked yet.

        Why did Apple remove the ability to create a RAID and what do they see replacing it currently and in the near future? Don’t be surprised if we later learn that Apple removed this because such a small percentage of users actually use this. “repair disk permissions” – I’ve heard this and defragging are not kind to SSD’s. Is this true? Is that why that was possibly removed?

        • Larry says:


          I don’t think Apple is trying to kill support for hardware RAIDS, or any RAIDs for that matter. As file storage needs increase, RAIDs are our only option. Disk Utility runs on older technology, what Apple killed was the ability to create software-based RAIDs using it. There are MANY manufacturers that provide RAIDs – both software and hardware – that work fine with El Capitan.

          It is somewhat unreasonable to expect computer hardware that is seven years old will support all the latest OS technology. At some point, you need to either buy new gear or stop upgrading your hardware.

          Repair Permissions is still actively supported in Disk Utility – it is built into the “Repair” button. Also, as hard disks increase in storage capacity, defragging is less important. And defragging is not a relevant concept for SSDs because they store data totally different from a traditional spinning media hard disk.


  7. Mark says:

    The older Disk Util from Yosemite can be patched to work with 10.11.x. The MacPro mentioned above probably uses Apple’s raid card which is very bugy and shouldn’t be used anyway (replace this with for instance Areca’s or Hightech raid card if you want to use a Macpro as server)

  8. James says:

    also lost my raid 0 – completely unable to mount it properly — just several “untitled” disks. WOW!!!

  9. Uli Plank says:

    You can still generate a RAID by booting into the Recovery partition and using the old Disk Utility there. Don’t know for how long, though…

  10. Can I create a concatenated drive (JOBD) with a mac booted into mavericks and then use that drive on an el capitan booted mac? Same quetsion for a Raid (0, 1, etc) drive? Or will El capitan just not read disks made with the old Disk Utility from maveriks?

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