On Aug 14, 2009, at 4:50 AM, Nigel Wade wrote:
Margaret Doll wrote:
We got to create the 13 Tb partition on the aux disk on the
RedHat system by using parted, but then mkfs.ext3 doesn't work on
any partition larger than 2 Tb.
It should do. I have 6 and 7.8TB filesystems. What version of RH are
you running? I suppose there may be limitations on some of the
kernels, I am running 64bit RHEL 4. However, I think there is
limitation of 8TB for ext2/3 on systems which have a max. block/page
size of 4kb. You need 8kb blocks/pages to get to 16TB, or a
different filesystem type and it's unlikely your system can handle
that. Do you know what the max. page size if for your system?
How would I find this?
If we split the aux disk into 2 Tb partitions, I understand from http://www.linuxnix.com/2009/04/logical-volume-manager-lvm-in-redhat.html
that we use fdisk to change the partition type to 83 Linux LVM.
Unfortunately fdisk will only see the first 2 Tb partition, so we
can't create a LVM
of the partitions.
If you want to go this way create individual LUNs on your RAID.
There is nothing to be gained by partitioning the RAID. You can join
the LUNs using LVM. That would enable you to create an LVM of 13TB,
but you've gained nothing over using the bare device. You don't need
a partition table on a device, you can create a filesystem on the
entire device, /dev/sdc for example, rather than /dev/sdc1 etc.
Using parted, I think we did create and ext3 filesystem on the entire
disk.
We went back to parted and created one 13 Tb partition. Then
inside parted, we used
mkfs 0 ext3
The program said that ext3 was not supported in this version of
parted, but ext2 was. I oked, ext2.
Inside parted
(parted) print
Model: IFT A16F-G2430 (scsi)
Disk /dev/sdc: 13.0TB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Number Start End Size File system Name Flags
1 17.4kB 13.0TB 13.0TB ext3 primary
the partition is labeled as a ext3 file system.
Our 13 Tb partition was added to /etc/fstab as a ext3 filesystem
and mounted on the system.
"df -h" though lists it as a 1.8 Tb system.
/dev/sdc1 1.8T 196M 1.7T 1% /m3team
Did you actually create a filesystem on that 13TB partition? Or did
you just use the filesystem which you had already created previously
when the partition was only 2TB? I'd be interested to know what mkfs
said when you asked it to create a 13TB filesystem, for example what
block size did it set.
What does 'dumpe2fs /dev/sdc1' show?
dumpe2fs /dev/sdc1 > dump.rpt
Where dump.rpt shows
Filesystem volume name: <none>
Last mounted on: <not available>
Filesystem UUID: 2e6d48bb-5cde-4be0-af94-edf95ad64801
Filesystem magic number: 0xEF53
Filesystem revision #: 1 (dynamic)
Filesystem features: has_journal resize_inode dir_index filetype
needs_recovery sparse_super large_file
Default mount options: (none)
Filesystem state: clean
Errors behavior: Continue
Filesystem OS type: Linux
Inode count: 244154368
Block count: 488281245
Reserved block count: 24414062
Free blocks: 480569334
Free inodes: 244154357
First block: 0
Block size: 4096
Fragment size: 4096
Reserved GDT blocks: 907
Blocks per group: 32768
Fragments per group: 32768
Inodes per group: 16384
Inode blocks per group: 512
Filesystem created: Thu Aug 13 15:26:09 2009
Last mount time: Thu Aug 13 15:59:28 2009
Last write time: Thu Aug 13 15:59:28 2009
Mount count: 1
Maximum mount count: 33
Last checked: Thu Aug 13 15:26:09 2009
Check interval: 15552000 (6 months)
Next check after: Tue Feb 9 14:26:09 2010
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: 149a19fb-3302-49ff-8314-3a02abd591d1
Journal backup: inode blocks
Journal size: 128M
Group 0: (Blocks 0-32767)
Primary superblock at 0, Group descriptors at 1-117
...
...
Group 14900: (Blocks 488243200-488275967)
Block bitmap at 488243200 (+0), Inode bitmap at 488243201 (+1)
Inode table at 488243202-488243713 (+2)
32254 free blocks, 16384 free inodes, 0 directories
Free blocks: 488243714-488275967
Free inodes: 244121601-244137984
Group 14901: (Blocks 488275968-488281244)
Block bitmap at 488275968 (+0), Inode bitmap at 488275969 (+1)
Inode table at 488275970-488276481 (+2)
4763 free blocks, 16384 free inodes, 0 directories
Free blocks: 488276482-488281244
Free inodes: 244137985-244154368
--
Nigel Wade, System Administrator, Space Plasma Physics Group,
University of Leicester, Leicester, LE1 7RH, UK
E-mail : nmw@xxxxxxxxxxxx
Phone : +44 (0)116 2523548, Fax : +44 (0)116 2523555
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