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Forum Discussion
Error restoring from Snapshot: LOGMSG_FSSNAP_RESTORE_FAILED
I received this error message trying to restore a file from two different snapshots. Downloaded the logs from today, but there are 86 of them, and I don't know where to look as to the exact culprit. ...
PWS442 wrote:I have 2.54TB of Data, yet only 403GB of Snapshots, and 18.89TB Free space. Seems odd, no?
Actually, no, it's not odd. Snapshots are not a complete copy of everything on your NAS. They are a separate set of pointers to the data at another point in time. That means any data not changed is pointed to by the current and snapshot pointers and only changed content has pointers to different sets of data. That's why snapshots can work going back many revisions without filling the drives.
Well, if it is a complete copy, then it should contain at least 2.54TB of data.
PWS442 wrote:
Well, if it is a complete copy, then it should contain at least 2.54TB of data.
As Sandshark says, that is not how they work. When they are first created, they take no space (another way to say this is that data blocks in snapshot and the share are all held in common).
As files are rewritten (or deleted), the changed blocks are no longer shared. The original blocks are only in the snapshot, the new blocks are only in the main share.
PWS442 wrote:
My files were deleted, and I assumed that a prior snapshot would contain them. Apparently I was wrong..
Were there snapshots in the main share? Did you try right-clicking on the folder in files were in,and look in "restore previous versions"?
The files showed up in the Snapshot, they were NOT in Windows Explorer (nor Mac Finder), as these folders were now empty. I clicked the Restore button (the file was the proper date/size), and received the error message.
Now that I have re-created the files, they no longer show up in the the last two days of snapshots (as they were created, and then modified the same day). But I bet if I change the FLAC artwork on one of them, it should be in the snapshot that will be taken tomorrow morning.
I suppose if I create and delete a file between snapshots, it will not appear. Yet, these files showed up in two days of snapshots.
I truly thought that any deleted file would show up in the snapshot. I do have notes from 2015 that I restored one or more files from this same share: /Volumes/Music/xxx/xxx Original/Jazz/Dave Grusin.
(BTW: xxx is used instead of M P 3, as that is not allowed in the text)
Ah, makes sense Sandshark.
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