dection 5Storage Devices.docx

Actually crank this up to roughly 100 and notice when

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actually crank this up to roughly 100 and notice when I do that, it tells me that the size of the storage space including resiliency, is 150 gigabytes which is pretty close to the available pool capacity of 151 gigabytes. Let's go ahead and change the storage space. And now the size has been increased to 100 gigabytes. And we're still using parity to protect the data within that storage space. So that's how you create a storage pool.
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Overbook a Storage Pool 8:31-10:52 Before we end, I want to show you one other neat feature of storage spaces. And that's the concept of overbooking. So to do this, I want to actually delete this storage space. I'm going to go ahead and say yes, it already contains data, I know that, but it's OK. So now we have a storage pool that's composed of these five drives, but there's no storage space defined in it. Let's go over here and click Create a Storage Space. Now, here's the thing that I want you to understand. And that is the fact that the sum of all the storage spaces defined within a single pool can actually exceed the size of the pool. We can do this because storage spaces will dynamically move space around and arrange things such that unused storage in one storage space can be re-allocated dynamically to a different storage space in the same pool that actually needs it. So let's go ahead and create our first storage space. We'll call it Storage Space One. For resiliency, let's use Parody. Now notice that the maximum size of the storage space that we can create is 102 gigs. Let's actually crank that down to 60, which will consume about 90 gigs of the available pool capacity. Create Storage Space. OK, so there's the first storage space. It's ready to go. Now, we have not used all of the capacity in the pool, so let's go ahead and create another storage space and let's call it Storage Space Two. We'll assign it drive letter F. We will use Parody, just like we did before. Now, what I'm going to do is set the size to 100 gigabytes. Now remember, I already created a storage space within the same pool that was 60 gigabytes in size and that bumps us to 160 gigabytes of space. Well, we only have 156 available, yet I'm able to create two storage spaces in the same pool and the sum of the sizes of the two storage spaces actually exceeds the total size of the pool. Storage spaces is just fine with it. Now there are certain limits. If you try to go too far, if you try to overbook the pool too much, it will stop you and not allow you. But in this situation, we were able to create two storage spaces, one at 60 gigs. One is about 100 gigs, which is bigger than the total size of the pool. And storage spaces will just manage the allocation of space between the two storage spaces within the same pool. Summary 10:53-11:02 That's it for this demonstration. In this demo, we talked about creating storage spaces. We first created a storage pool, then we created a storage space, and then we ended this demonstration by talking about how to overbook a storage pool.
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