BRRABill's Field Report With XenServer
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I'm sure that it is often handy to know which VM is eating up space in case you are going to go do some storage load balancing. But in a case where you are preparing to do that, running a du command against the storage is pretty trivial.
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@scottalanmiller
My XS (through XC) is showing I have 1.5 TB allocated, but only 1.1 TB of actual storage.
Now currently I'm running a backup of the 700 GB system, so I'm wondering - is the allocated counting both the snap shot and the live running disk, plus my other few VMs in that total of 1.5 TB? that would add up about right.
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Yes, the snaps should be included in the used figure.
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@scottalanmiller said:
Yes, the snaps should be included in the used figure.
that's just strange to me because, clearly the Snap isn't 700+ GB, because if it was, I'd be 500 GB short on storage.
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@Dashrender said:
@scottalanmiller said:
Yes, the snaps should be included in the used figure.
that's just strange to me because, clearly the Snap isn't 700+ GB, because if it was, I'd be 500 GB short on storage.
Why does that seem strange, what am I missing?
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Well - what does allocated mean to you? It means in use.
Though I've seen allocated to mean - I have allocated this VHD to 1 TB, though when setup with Thin Provisioning.. it will only grow as things push it into actual needed space. As mentioned previously it won't shrink (at least not on it's own) when things are deleted from the filesystem inside the VHD. So in that case allocated means max usable, even though it's not what's currently in use.
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The snapshot (from what I can see) allocates the exact same amount of space.
So if the virtual disk is allocated 100GB, the snapshot will also be allocated 100GB.
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@Dashrender said:
Well - what does allocated mean to you? It means in use.
Though I've seen allocated to mean - I have allocated this VHD to 1 TB, though when setup with Thin Provisioning.. it will only grow as things push it into actual needed space. As mentioned previously it won't shrink (at least not on it's own) when things are deleted from the filesystem inside the VHD. So in that case allocated means max usable, even though it's not what's currently in use.
Snaps are not part of that pool, though.
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Not part of what pool?
Here it's showing everything together.
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Snaps are not part of the "amount I intended to allocated with the main disks." Snaps are extra on top of that.
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@scottalanmiller said:
Snaps are not part of the "amount I intended to allocated with the main disks." Snaps are extra on top of that.
Then why list it in the allocated pool?
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@Dashrender said:
@scottalanmiller said:
Snaps are not part of the "amount I intended to allocated with the main disks." Snaps are extra on top of that.
Then why list it in the allocated pool?
Because it IS allocated and using space. It has to be shown.
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@scottalanmiller said:
@Dashrender said:
@scottalanmiller said:
Snaps are not part of the "amount I intended to allocated with the main disks." Snaps are extra on top of that.
Then why list it in the allocated pool?
Because it IS allocated and using space. It has to be shown.
where is it using 700 GB? it can't be - I simply don't have 700 for it to be using.
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@Dashrender said:
where is it using 700 GB? it can't be - I simply don't have 700 for it to be using.
That's the max size it could ever be. A duplicate of the amount for the drive it is snapshotting. (Is that a word?)
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@Dashrender said:
@scottalanmiller said:
@Dashrender said:
@scottalanmiller said:
Snaps are not part of the "amount I intended to allocated with the main disks." Snaps are extra on top of that.
Then why list it in the allocated pool?
Because it IS allocated and using space. It has to be shown.
where is it using 700 GB? it can't be - I simply don't have 700 for it to be using.
It's not, that's thin provisioning, isn't it?
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@BRRABill said:
@Dashrender said:
where is it using 700 GB? it can't be - I simply don't have 700 for it to be using.
That's the max size it could ever be. A duplicate of the amount for the drive it is snapshotting. (Is that a word?)
Yes
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Both yes, that is what you are seeing and yes, that is a word.
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@scottalanmiller said:
@BRRABill said:
@Dashrender said:
where is it using 700 GB? it can't be - I simply don't have 700 for it to be using.
That's the max size it could ever be. A duplicate of the amount for the drive it is snapshotting. (Is that a word?)
Yes
I used the layman terms. Because I am, well, you know...
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Does XS support reclaiming/compacting space in a virtual disk?
I know it says it does not support shrinking a virtual disk, but can you reclaim (compact) that space?
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@BRRABill said:
Does XS support reclaiming/compacting space in a virtual disk?
I know it says it does not support shrinking a virtual disk, but can you reclaim (compact) that space?
am I mising something? Isn't shrinking the same as reclaiming?
