I'm horsing around with ext4 again. This time on Fedora 10. Is there any
sane reason why I cannot use the *full* 16TiB volume?
----8<----
# vgcreate foo /dev/mapper/mpath*
Volume group "foo" successfully created
# lvcreate -L16T -nbar foo
Logical volume "bar" created
# mkfs.ext4 -Tlargefile4 /dev/foo/bar
mke2fs 1.41.3 (12-Oct-2008)
mkfs.ext4: Size of device /dev/foo/bar too big to be expressed in 32 bits
using a blocksize of 4096.
----8<----
But it appears to *really* allow up to one PE less than the full 16TiB,
why?
----8<----
# vgdisplay foo
--- Volume group ---
VG Name foo
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 0
Max PV 0
Cur PV 2
Act PV 2
VG Size 18.19 TB
PE Size 4.00 MB
Total PE 4769266
Alloc PE / Size 4194304 / 16.00 TB
Free PE / Size 574962 / 2.19 TB
VG UUID tPk8uJ-gIYZ-GJSU-ssob-IoYu-8AUp-pHKALO
# lvremove -f foo/bar
Logical volume "bar" successfully removed
# lvcreate -l4194303 -nbar foo
Logical volume "bar" created
# mkfs.ext4 -Tlargefile4 /dev/foo/bar
mke2fs 1.41.3 (12-Oct-2008)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
1073741824 inodes, 4294966272 blocks
214748313 blocks (5.00%) reserved for the super user
First data block=0
131072 block groups
32768 blocks per group, 32768 fragments per group
8192 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, 1934917632,
2560000000, 3855122432
Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done
This filesystem will be automatically checked every 35 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
----8<----
In my use case, I'm using much larger PEs, so the loss if just one is
significant. Is this a bug in my thinking? Or in the userland tools?
../C
_______________________________________________
Ext3-users mailing list
Ext3-users@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/ext3-users
