linux-ext4 - Re: #blocks per group too big: 37265

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Date:	Fri, 4 Apr 2008 11:21:20 +0200
From:	Paul Slootman <paul@...tel.net>
To:	linux-ext4@...r.kernel.org
Subject: Re: #blocks per group too big: 37265

> The stride parameter is the problem.  Newer versions of e2fsprogs
> don't allow a stride parameter which is too big.  If you want to do
> the perfect calculation, you take the 64k chunk size, and divide it by
> the 4k blocksize to yield a stride parameter of 16.  Actually, though,
> simply using a non-zero stride size is actually good enough --- and if
> you have a even number of RAID-5 disks, you might not need this
> parameter at all.  (It's only purpose is to perturb the location of
> the block bitmaps so that all of the bitmaps don't end up on a single
> hard drive.)

Actually, as I wrote:

>> Removing the stride option didn't help. Removing all options didn't
>> help...

I still end up with a "blocks per group" of 37265, and when mounted I'm
greeted with the message "EXT4-fs: #blocks per group too big: 37265".
Is the ext4 code in the 2.6.25-rc8 kernel too old? According to the
source the number of block per group must be <= 8 * blocksize; with 4k
blocks that would mean 32768, not 37265.

Even passing the -g option to explicitly set the blocks per group gets
ignored.

> BTW, we will be making a new snapshot for people who want to test ext4
> soon....

Kernel code and userspace utils? Or just kernel code?
Where can I find the most recent version of both? I looked at
Documentation/filesystems/ext4.txt, but I feel that's a bit outdated:

  - It's still mke2fs -j /dev/hda1

  - mount /dev/hda1 /wherever -t ext4dev

This ignores the fact you need to set the testing option...

Thanks,
Paul Slootman
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