Re: XFS File system in trouble

From: Martin Papik <mp6058@gmail.com>
To: xfs@oss.sgi.com
Subject: Re: XFS File system in trouble
Date: Tue, 28 Jul 2015 22:12:00 +0300	[thread overview]
Message-ID: <55B7D400.50202@gmail.com> (raw)
In-Reply-To: <55B7B390.1050206@sandeen.net>

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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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