windows一键还原，阴影卷创建报错，shadowcopy error - User Imposed Limit

windows 系统自带的还原备份功能，底层使用 shadowcopy（阴影卷）技术。

该技术采用了 copy on write 的方式， 当每次有新 IO 时，老的数据会被拷贝出来，然后再写新的 IO

最近调用该接口时报错 “ Event ID 36， User Imposed Limit ”，经过调查发现。当阴影卷报错 “User Imposed Limit ”, 最大可能是创建阴影卷的磁盘没有空间，需要扩容。

参考：

How to Fix VolSnap 36 Error User Imposed Limit – Volume Snapshot
VolSnap 36 event ID may show up as error:
Volume Snapshot Driver, Diff Area health issues

Event ID 36
Source volsnap

The shadow copies of volume C: were aborted because the shadow copy storage could not grow due to user imposed limit or a related message.
Basically VolSnap 36 is an error event that signals an issue with the diff area being used by VSS.

It could be：

a low limit for the diff area, see http://backupchain.com/i/how-to-fix-volsnap-25-error

a disk I/O issue

a bad sector on disk: use chkdsk X: /b to check for bad blocks (may require a reboot)

system load is too high for the diff area to grow fast enough

a corrupt file system issue. Use Chkdsk with /r option, better use /b to also check for bad sectors

The most common cause is #1. Use the solution in the article linked above; however, checking the other potentialities may also be a good idea if the disk hasn’t been checked in a while.
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