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Storage Spaces questions...

  1. #11


    Posts : 5,707
    Windows 8.1 Pro


    Quote Originally Posted by pparks1 View Post
    Quote Originally Posted by Coke Robot View Post
    Say, if I have a 120 gig SSD that I do backups of as well as my current 585 gigs worth of video content as well as other user data files. And I have 12 three TB hard drives going in Storage Spaces. I make the pool size to be 36 TB's as I do not choose to be deceived (more like I can't fit in more drives and don't want to do external). Is the total usable space in that pool 36 TBs physically? And if I copy over 705 gigs of data over to the pool, is that data mirrored on ALL drives twice if I choose to have two copies of data?
    With virtual machines, I cannot duplicate this exactly, a 2TB drive is the max size I can create. So, what I did was create 12 x 1TB volumes...and can multiply by 3 to roughly figure out the answer to your question.

    With 12 x 1GB volumes in a single storage pool, it shows 3.0GB used out of 11.7TB total. ( I doubled back and created 12 x 2TB files, and it too was consuming 3.0GB out of 23.74GB). So, with 3TB drives, I would still expect overhead of around 3.0GB for the entire storage pool.

    So, in the case of my 12 x 1TB setup,
    1). no resiliency: 11.7TB usable
    2). 2way mirror: 5.85TB usable
    3). 3way mirror: 3.90TB usable
    4). parity: 7.80TB usable.

    In the case of my 12 x 2TB pool
    1). no resiliency: 23.4TB
    2). 2way mirror: 11.7TB
    3) 3 way mirror: 7.80TB
    4). parity: 15.6TB.


    So, in your case, with 3TB x 12 drives
    1). no resiliency: 35.1TB usable
    2). 2 way mirror: 17.55TB usable
    3). 3 way mirror: 11.7TB usable
    4). parity: 23.4TB.

    So, 2 answer your question, if you put in 12 x 3TB drives, and set it up for 2 way mirroring, you get 17.55TB of space to use (without thin provisioning...or deceiving as you called it). So, if you copy 700GB of data onto that volume, it would be 17.55TB - 700GB so 16.8TB or so left

    I really hope that helps you.


    I really suggest figuring out if you truly need this kind of disk capacity. The more physical drives you add, the more likelyhood that you have of 1 of them failing. The beauty of Storage Spaces is the ability to simply grow your pool as you need to. So, even if you put in 2 x 3TB drives now..you could still create an 18TB 2 way mirror volume. So, you would start with an actual usable space of 3TB and when you get close to filing it, you can simply add another 3TB and another 3TB and another 3TB and continuously grow and expand your pool.

    Your other option would be to start with 2 x 3TB drives in a 2 way mirror and create the initial storage space of 3TB Once you come close to filling that, add another 2 x 3TB drives, and then you can GROW the Storage Space to 6TB. You can grow the Storage Spaces larger, you simply cannot make them smaller. If you need to make it smaller, you have to copy all of the data onto another Storage Space, delete the original storage space, create a smaller one, and then copy data back.

    Also, please remember that Storage Spaces is NOT a substitute for Backups. No RAID setup is. If your house burns to the ground, all 12 of your drives will be destroyed. So, make sure that with whatever solution you choose to role out, that you have enough capacity to back it up externally and hopefully on a device that you can remove from your home to protect against theft, fire, disaster.
    Click image for larger version
    Oh wow, THAT definitely helped to clear things up! Thank you!

    I will be starting out with like a couple 3 TB hard drives first, as I will just grow it out when needed versus having 12 drives running, spend a crapton of money right away, and not utilize all that space right away.

    The resiliency option that seems more or less useful in my situation is the parity option, as I will just have loads of DVD movie backups and user data that doesn't change often. I'm wondering though, the overhead is of course the taxer on the processor? Or do I just take a write speed hit? Or both?!

    After my hard drive passing away from this life, OOOOOOOOOOOOHHHHHHHHHHH YEAH will I be backing up as much as possible! Luckily, SkyDrive has like 90 percent of my vital files that I lost, like documents and pictures. Music is gone though, as well as a huge chunk of video. I'm thinking I might consider a 100 gigs or so of paid SkyDrive storage for my music, documents, and pictures; as well as those files in a parity storage pool. As well as taking probably a 2.5 inch hard drive to back those things up from time to time along with an image of my future SSD. I'm still considering the better method here. I'm also probably going to see if the additional expansion to the bottom of a puter case I'll be using can house a hard drive or two just for pure backups if needed.

      My System SpecsSystem Spec

  2. #12


    Posts : 5,707
    Windows 8.1 Pro


    Quote Originally Posted by Mystere View Post
    Actually, a number of years ago I learned the lesson that redundant drives are not a backup.

    I had two RAID1 mirrored drives, and had my entire music collection on it. One day I heard this loud BANG, like a gun going off, or a giant firecracker. I went in to my office to find the magic smoke had escaped from my computer and it was no longer functional.

    Turned out, the Power Supply had literally exploded. Well, a capacitor had anyways.. Blew itself right up good and hard.

    The result was that a power surge went through the computer, including both of my mirrored drives. It literally melted the circuit boards on the disks. No way to recover.

    So the point is, there's a lot more to worry about than just a fire, or an airplane crashing into your house, or an earthquake.. or some other disaster. Very simple problems can completely destroy your entire computer. Do offsite backups.
    A power supply exploding?! WOW! That's insane!
      My System SpecsSystem Spec

  3. #13


    The parity option is going to be a performance hit, both cpu as well as hard drive. And performance will be bad in the event a drive does fail and while the array is rebuilding. Unless you absolutely need all of the space, in my opinion the two way mirror for anything important is the way to go.
      My System SpecsSystem Spec

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