Windows 10: Storage Spaces Mirror 2 Drives?

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  1. Posts : 62
    Windows 10 Pro
    Thread Starter
       17 Nov 2016 #11

    Here's the whole story: I'm looking at this as a solution for an older person who is not disciplined enough to do proper backups and if her current data disk fails it will be a big loss for her. I have a virus free backup of her OS/Apps SSD (I use Paragon) as well as her files - all safely stored elsewhere. But it looked like Storage Spaces was MS's version of Apple's 'Time machine' and would provide increased security for those files that are created between the backups. Obviously if she's hit by a serious virus and/or ransomware she'll lose whatever files were created after the last real backup. But in her case I feel that a hard disk failure is a greater risk and that's why I'm considering a 2-disk mirror.
      My ComputerSystem Spec

  2.    18 Nov 2016 #12

    I'd be tempted to use file history for this situation using a disk that is not permanently connected (an external USB disk say). Just plug it in once a week and unplug it when it is finished - there is no need to actually click on anything or take any option to do anything.

    Having disk mirroring would protect against hardware failure of one of the disks (as would scheduling backups from one disk to another to a lesser extent). Neither would protect against ransomware as it would encrypt all attached disks.

    With file history backups of changed documents are stored on C drive and flushed out to the backup disk when it is connected. If you leave it too long it pops up a message and tells you to plug in the backup disk. It is more similar than other solutions to Time Machine as you can flip back and forwards through time to find different versions of changed documents. It also holds copies of deleted documents which mirroring wouldn't. Backups would have copies of deleted documents but they are harder to find if you don't know when you deleted it.

    In a way File History is preferable to just backups as you would have to lose both your OS and data disks to lose documents while with scheduled backups if you lost the data disk you would lose everything since the last backup.

    You can do more that one of course. I use File history and make macrium backups. I have a laptop so it isn't practical but if I had a desktop (and data I cared about or needed my PC to keep running in case of drive failure) I'd probably do mirroring as well.

    Incidentally, you can't read a disk you pull from a mirrored pool directly but you can rebuild the pool using a separate Windows PC - at least that is what I understand from here...
    Jason Gerend_MSFT 20 Aug 2012 5:24 PM
    if you remove a single drive from the pool and plug it into another computer that is not running Windows 8 the data won't be accessible.
    Storage Spaces Frequently Asked Questions (FAQ) - TechNet Articles - United States (English) - TechNet Wiki
    Last edited by lx07; 18 Nov 2016 at 03:12.
      My ComputerSystem Spec

  3.    18 Nov 2016 #13


    An excerpt from the link provided by lx07:

    Mirror spaces are designed for increased performance and increased resiliency. Two-way mirror spaces can tolerate one disk failure and three-way mirror spaces can tolerate two disk failures. They are well suited to storing a broad range of data, from a general-purpose file share to a VHD library. When a mirror space is formatted with the Resilient File System (ReFS), Windows offers automatic data integrity maintenance. This is a layer of resiliency is above and beyond the resiliency achieved from maintaining multiple data copies to tolerate drive failure.
    Mirror spaces require at least two disks (per tier if you use storage tiers) to protect you from a single disk failure. To protect a virtual disk from two simultaneous disk failures, you need at least three disks (per tier), with a minimum of five disks total in the pool to maintain pool metadata.
    mirroring isnt virus proof as if you get a virus its mirrored to the other drive with images you can have several known clean one and roll back if an update goes wrong if an update goes wrong on mirror you have no roll back
    Nothing ever is but the setup as described in the quote above sure is a lot more resilient than just a basic disk.

      My ComputerSystem Spec

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