Hello, I have: CentOS4.1 x86_64 directly-attached Infortrend 9TB array QLogic HBA seen as sdb GPT label created in parted I want one single 9TB ext3 partition. I am experiencing crazy behavior from mke2fs / mkfs.ext3 (tried both). If I create partitions in parted up to approx 4,100,000 MB in parted, mkfs.ext3 works great. It lists the right number of blocks and creates a filesystem that fills the partition. Any partition approx 4,200,000 MB and larger, mkfs.ext3 sees a totally random number of blocks, equivalent to a few hundred GBs of space. It create healthy partitions, but they are way too small!!! >From dmesg to parted, I can see the system recognizes the hardware properly, including the number of blocks. And I know the upper limit of ext3 is 16TB, not 4! What am I doing wrong? What wall am I hitting around 4TB? HELP!!! Thanks, Francois Caen output of a few commands: (parted) p Disk geometry for /dev/sdb: 0.000-9149550.000 megabytes Disk label type: gpt Minor Start End Filesystem Name Flags 1 0.017 4100000.000 ext3 <------ 4TB partition 2 4100000.000 9149549.983 <------- 5TB partition # mke2fs -n /dev/sdb1 mke2fs 1.35 (28-Feb-2004) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) 524812288 inodes, 1049599995 blocks <------------ GOOD!!!! 9530326 blocks (0.91%) reserved for the super user First data block=0 Maximum filesystem blocks=4294967296 32032 block groups 32768 blocks per group, 32768 fragments per group 16384 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 102400000, 214990848, 512000000, 550731776, 644972544 # mke2fs -n /dev/sdb2 mke2fs 1.35 (28-Feb-2004) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) 109477888 inodes, 218942971 blocks <-------- BAD!!!!! only 830GB!!! 10947148 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=4294967296 6682 block groups 32768 blocks per group, 32768 fragments per group 16384 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624, 11239424, 20480000, 23887872, 71663616, 78675968, 102400000, 214990848