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快照独占使用vs可回收空间

4年前
2017年6月1
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1 marc1
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嗨,团队,
已创建保护域，且保护域内包含1台虚拟机。我已经建立了一个每天的时间表，保留政策是5。当我查看本地快照时，我显示了最后5个可用的快照。这是同样的，当我勾选框“包括过期”。当我将这5个快照的可回收空间加起来时，总空间为143.72 MiB。当我看到PD的“快照独占使用”的值时，它告诉我492.48 MiB。为什么会有这样的差异呢?
相关问题:删除快照对性能有什么影响?我知道这是一个后台进程，但当它启动或运行时，对受保护的虚拟机有任何影响吗?
环境运行AOS 5.0.1。
谢谢你！
马克。

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最佳答案dlink72017年6月8日，05:16

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\nI have created a Protection Domain with one VM. I have setup a daily schedule with a retention policy of 5. When I look at the local snapshots, I shows me the last 5 snapshots that are available. This is the same when I tick the box \"Include Expired\". When I add up the reclaimable space for these 5 snapshots, the total comes to 143.72 MiB. When I look at the value of \"Snapshot Exclusive Usage\" for the PD, it tells me 492.48 MiB. Why the difference?
\nOn a related question: what is the impact on performance when deleting snapshots? I understand it is a background process, but is there any impact on the protected VM(s) when this is initiated or while it runs?
\nThe environment is running AOS 5.0.1.
\nThank you.
\nMarc.","quoteUsername":"1marc1","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

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dlink7
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4年前
2017年6月1

快照独占是指特定于该快照的数据，即快照链中没有任何其他vdisk对该vdisk中的vblock的引用。
可回收空间:这是空间将会更高，因为这也包括了vdisk快照链中更低的vblocks，这些vblocks纯粹是由快照引用的(可能有其他区域被快照链上的其他vdisk引用)。

这个数字应该等于或大于上述数字的总和

\nreclaimable space: this is the space is going to be higher since this also accounts for vblocks in the vdisk snapshot chain further down that are purely references by just the snapshot (there could be other regions that are referenced by other vdisks further up the snapshot chain)
\n
\nthis number should be equal to or higher than the summation of the above number","quoteUsername":"dlink7","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

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1 marc1
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4年前
2017年6月2

谢谢你的回复dlink7，但是我还是有点困惑。
首先，您能否回顾一下您对“快照独占”和“可回收空间”的描述确实属于这些术语?我觉得你把它们换了。

我决定在《Nutanix圣经》里的图画上展开来试图抓住这个问题。看到我的画内联，如下。

您(或其他人)可以看看我在关于可回收空间和快照独占使用方面所画的两个框框中的结论是否正确?

谢谢你！

马克。

\nFirst of all, can you review that the descriptions you have given for \"snapshot exclusive\" and \"reclaimable space\" indeed belong to these terms? I have a feeling that you swapped them around.
\n
\nI decided to expand on the drawing that is in the Nutanix bible to try to get to grips with this. See my drawing inline, below.
\n
\n
\n
\n

<\/a><\/p>
\n
\n
\n
\nCan you (or anyone else) have a look to see if the conclusions I draw in the double outlined boxes are correct in relation to reclaimable space and snapshot exclusive usage?
\n
\nThank you.
\n
\nMarc.","quoteUsername":"1marc1","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">