Disk lvm mounting and display capacity problems in linux

Article Title: linux disk lvm mounting and display capacity problems. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

In linux as 4 update 5, a 30 t cabinet is mounted through the memory card, namely,/sda1,/sda2,/sda3,/sda4,/sda5/, and each cabinet size is 5.7T. except for sda5 3.7 t.

I have created an lvm for/sda2,/sda3,/sda4,/sda5 and displayed it as 20.64 Tb (correct). Then I created the lvm directory under the root directory.

Mount/dev/lv00/vg00 to/lvm and use df-h to display the capacity. This lvm only has 4.7 TB. What is the problem?

[Root @ oracle lvm] # lvdisplay

/Dev/sdc: read failed after 0 of 4096 at 0: Input/Output Error

--- Logical volume ---

LV Name/dev/vg00/lv00

VG Name vg00

Lvuuid XUG7BE-xx02-Zzox-xtvP-brwV-bhCs-qRt8nE

LV Write Access read/write

LV Status available

# Open 1

LV Size 20.64 TB Current LE 5410653

Segments 4

Allocation inherit

Read ahead sectors 0

Block device 253: 0

Mount/dev/vg00/lv00/lvm

[Root @ oracle lvm] # df-h

Filesystem capacity in use available % mount point

/Dev/sde3 659G 326G 300G 53%/

/Dev/sde1 7.7G 116 M 7.2G 2%/boot

None 4.0G 0 4.0G 0%/dev/shm

/Dev/sda1 5.7 T 183 M 5.6 T 1%/down

/Dev/mapper/vg00-lv00

4.6 T 121 M 4.5 T 1%/lvm # this place only has 4.7 T, actually my LVM divides 20.64 T

Why is lvm division correct to display limit 4 t. But it becomes 4.7 TB in the lvm directory? Does AS4 not support such a large file?

Note: The ext3 file system supports up to 8 TB and 16 TB files.

1. If the number of pv-vg-lv instances exceeds the limit, the pv-vg-lv instances are running smoothly. Finally, the formatting is smooth?

2. If the maximum capacity is 8 TB or 16 TB, but the capacity of my LVM is 20 TB, only 4.7 is mounted to the LVM directory. Why is 8 TB or 16 TB not displayed.