View Full Version : [all variants] How to mount ext3 partition with 16k blocksize?

October 6th, 2009, 09:04 AM

I have a disk that contains a LVM2-volume which has been created by my ReadyNAS, and I want to access the data by mounting the disk manually by hooking it up to my workstation.

It seems that the ReadyNAS has created a Ext3 partition with a blocksize of 16k, which gives me the following error when I try to mount it:

EXT3-fs: bad blocksize 16384

pvscan gives:

PV /dev/sdb5 VG c lvm2 [463,53 GB / 0 free]
Total: 1 [463,53 GB] / in use: 1 [463,53 GB] / in no VG: 0 [0 ]

lvscan gives:

ACTIVE '/dev/c/c' [463,53 GB] inherit

tune2fs -l on the logical volume (/dev/c/c) gives:

tune2fs 1.41.4 (27-Jan-2009)
Filesystem volume name: c
Last mounted on: <not available>
Filesystem UUID: 71df24e7-a61e-4685-a9b8-b5f8377bd6a3
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal resize_inode dir_index filetype
needs_recovery sparse_super large_file
Filesystem flags: signed_directory_hash
Default mount options: (none)
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 15204352
Block count: 30377984
Reserved block count: 0
Free blocks: 30223788
Free inodes: 15204327
First block: 0
Block size: 16384
Fragment size: 16384
Reserved GDT blocks: 128
Blocks per group: 65528
Fragments per group: 65528
Inodes per group: 32768
Inode blocks per group: 256
Filesystem created: Mon Oct 5 08:55:09 2009
Last mount time: Mon Oct 5 14:36:47 2009
Last write time: Mon Oct 5 14:36:47 2009
Mount count: 6
Maximum mount count: -1
Last checked: Mon Oct 5 08:55:09 2009
Check interval: 0 (<none>)
Reserved blocks uid: 0 (user root)
Reserved blocks gid: 0 (group root)
First inode: 11
Inode size: 128
Journal inode: 8
Default directory hash: tea
Directory Hash Seed: e3c673bd-9347-865f-4923-fb8e931660a7
Journal backup: inode blocks

Is there a way to mount this partition with a blocksize of 16k ?

Thanks in advance!

Best regards,

October 6th, 2009, 10:19 AM
I am not sure how to mount 16k blocksize ext3 partitions, but I am under the impresion that this is a limitation from the kernel..
I think the default size is 4k.
Try to recreate your partition with 4k block size, then mount it.