Re: large raid array and fedora 5

Dances With Crows wrote:
tat staggered into the Black Sun and said:
I want to create only one linux partition on a raid 5 array (3.5 TB).
I could not do that with fdisk in fedora 5. I read the net and found
out about 2TB size limit.

Ordinary x86 partition tables are limited in the partition sizes that
can be specified. 32 bits unsigned max * 512-byte sectors = 2T, I
think. You will probably need to use a GPT table.

I have been using a cluster from somewhere in my school and with df
command I saw that the home directory is a raid array and its size is
5.5TB. The cluster is running some kind of linux

The maximum size of an ext3 filesystem is 2T. They might be using XFS,
which can handle larger filesystems.

How can I create a single partition (ext3) on [a 3.5T] raid-5? What
command should I use?

You can't have an ext3 filesystem that's larger than 2T.


The max size for a ext3 file system is 32TB if you use 8kB block sizes.
I have several systems with ext3 file systems larger than 4TB.

mneme # uname -a
Linux mneme 2.6.19-gentoo-r5 #1 SMP Wed Apr 11 11:23:40 EDT 2007 x86_64
Dual Core AMD Opteron(tm) Processor 285 AuthenticAMD GNU/Linux
mneme # df -Th /dev/md/3
Filesystem Type Size Used Avail Use% Mounted on
/dev/md/3 ext3 6.4T 594G 5.5T 10% /home/bacula3

From /usr/src/linux/Documentation/filesystems/ext2.txt:

Most of these limits could be overcome with slight changes in the
on-disk format and using a compatibility flag to signal the format
change (at the expense of some compatibility).

Filesystem block size: 1kB 2kB 4kB 8kB

File size limit: 16GB 256GB 2048GB 2048GB
Filesystem size limit: 2047GB 8192GB 16384GB 32768GB


--
Dr. Douglas O'Neal
Manager, Bioinformatics Center
Delaware Biotechnology Institute
(302) 831-3456
.