creating LV more than 8TB in RHEL5.3

chethu.prakrithi · 09-02-2010, 05:28 PM

how can we achive more than 8TB size for one LUN.?I am getting following error..

[root@storage ~]# mke2fs -j /dev/VG01/data
mke2fs 1.39 (29-May-2006)
mke2fs: Filesystem too large. No more than 2**31-1 blocks
(8TB using a blocksize of 4k) are currently supported.

macemoneta · 09-03-2010, 06:50 AM

If you're hitting the filesystem limit, you need to use another filesystem. The replacement for ext4 is btrfs. Use 'mkfs -t btrfs'.

syg00 · 09-03-2010, 07:18 AM

That looks suspiciously like a ext3 mkfs, not ext4 - either should accommodate larger than 8T.
Maybe you need a 64-bit system to get large counters. What arch is this ? - "uname -a" should tell us.

macemoneta · 09-03-2010, 07:37 AM

Whether it's ext3 or ext4 will depend on the specific distribution's /etc/mke2fs.conf. In any case, the kernel/e2fsprogs limit has been reached, according to the message.

Could try forcing ext4:

mkfs.ext4 -m0 /dev/VG01/data

chethu.prakrithi · 09-04-2010, 02:25 AM

Thanks everybody for reply,

server is an x64 platform and kernel 2.6.18-128.
even though RHEL doc says that ext3 on x64 platform support upto 32TB it is limiting us at 8TB.I successfully done one partition wich is of 13 TB in ext3 by using following command.mkfs.ext3 -F /dev/VG01/data.But here i am able to do till 16TB.i suppose i may require ext4 to create one partition which is of 28TB,and which is not available on this kernel.if i am wrong correct me.and if u have any other sollution please let me know.

macemoneta · 09-04-2010, 07:24 AM

Are you running RHEL 4 or earlier? 8TB was the limit, as far as I can find.