Re: Heads up: e2fsprogs-1.42-WIP-0702 pushed to rawhide

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On 10/3/11 4:05 PM, Richard W.M. Jones wrote:
> On Mon, Oct 03, 2011 at 03:10:43PM -0500, Eric Sandeen wrote:
>> On 10/3/11 1:13 PM, Richard W.M. Jones wrote:
>>> On Mon, Sep 26, 2011 at 02:51:33PM -0500, Eric Sandeen wrote:
>>>> Another little heads up - a newer snapshot is built in rawhide now.
>>>>
>>>> Anyone who wants to fiddle with large ext4 filesystems, have at
>>>> it please!
>>>
>>> Is there any background information to this change that I can read?
>>>
>>> I created a 2**60 byte disk, partitioned it, and tried to create an
>>> ext4 filesystem on it, but that doesn't work:
>>
>> heh; going for the gusto I see!
>>
>> Can we maybe start with a mere 500 terabytes? ;)
> 
> Well I started with 2**63-513, but sadly qemu has a bug that prevents
> me from writing to such a disk ...
> 
> https://rwmj.wordpress.com/2011/10/03/maximum-qcow2-disk-size/
> https://bugs.launchpad.net/qemu/+bug/865518
> 
>>>   ><rescue> mke2fs -t ext4 /dev/vda1 
>>>   mke2fs 1.42-WIP (25-Sep-2011)
>>>   
>>>   Warning: the fs_type huge is not defined in mke2fs.conf
>>
>> Icky, but unrelated to below, I think
>>
>>>   /dev/vda1: Cannot create filesystem with requested number of inodes while setting up superblock
>>
>> sounds like it calculated an inode ratio that put it over the 2^32 inode nr. limit.
>>
>> I'll look into it.
> 
> Thanks.  Let me know if/when there's anything else I can test.

testing something more real-world (20T ... 500T?) might still be interesting.

I'm finding a couple issues already right up at the theoretical max limit,
just at mkfs time :(

-Eric

> Rich.
> 

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