kernel: EXT3-fs: Unsupported filesystem blocksize 8192 on md0.

Ulrich Windl ulrich.windl at
Thu Aug 2 09:55:53 UTC 2007


I made an ext3 filesystem with 8kB block size:
# mkfs.ext3 -T largefile -v -b 8192 /dev/md0
Warning: blocksize 8192 not usable on most systems.
mke2fs 1.38 (30-Jun-2005)
Filesystem label=
OS type: Linux
Block size=8192 (log=3)
Fragment size=8192 (log=3)
148480 inodes, 18940704 blocks
947035 blocks (5.00%) reserved for the super user
First data block=0
290 block groups
65528 blocks per group, 65528 fragments per group
512 inodes per group
Superblock backups stored on blocks:
        65528, 196584, 327640, 458696, 589752, 1638200, 1769256, 3210872,
        5307768, 8191000, 15923304

Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 22 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

When mounting it as ext2 (by mistake), the kernel says:
EXT2-fs warning (device md0): ext2_fill_super: mounting ext3 filesystem as ext2

When finally mounting the filesystem as ext3, the kernel says:
kernel: EXT3-fs: Unsupported filesystem blocksize 8192 on md0.

I don't quite understand: About any larger filesystem of today can support blocks 
> 4kB. What is the problem here?

Kernel is (SUSE SLES10 SP1) on IA64


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