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