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How about this?
qemu-img create -f qcow2 test 32T
qemu-nbd -c /dev/nbd0 test
xfs_mdrestore -g md0.metadump /dev/nbd0
>>>
>>> Hmm, I guess the file size exceeds the capabilities of the root
>>> fs, even if there might ultimately be enough space to restore
>>> the metadump.
>>
>> I wouldn't think so, at least not fundamentally. It's ext4. It's
>> certainly not big enough to hold an 18T file system, though, and
>> perhaps that is what xfs_restore is checking.
>
> No, it's just failing to write any data at an 18T offset.
>
> The ext4 filesystem (with 4k blocks) is limited to a 16T maximum
> file offset; you won't be able to restore a (sparse) 18T
> filesystem image onto an ext4 filesystem.
>>
>> RAID-Server:/TEST# xfs_mdrestore -g md0.metadump RAIDfile.img
>> xfs_mdrestore: cannot set filesystem image size: File too large
>>
>
> Hmm, I guess the file size exceeds the capabilities of the root fs,
> even if there might ultimately be enough space to restore the
> metadump.
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