用 vi 更新文件问题

现时环境处於:
1. Windows 7 Profession shared a folder with a local user (full control)
2. the shared folder is accessed by Two sets of Oracle Linux 5 server
mount -t cifs //0.0.0.0/shared_folder /mnt/pc001_dsk_1/ -o username=xxx, password=xxx, codepage=cp950 iocharset=utf8
3. Used the below commands, created a image file and placed on the shared folder
dd if=/dev/zero of=/mnt/pc001_dsk_1/asmdisk1 bs=1024k count=10000
/sbin/losetup /dev/loop1 /mnt/pc001_dsk_1/asmdisk1/asmdisk1
4. Used the below commands, mounted the image file as disk in each Linux Server
mkdir /mnt/asmdisk1
mount -t ext3 /dev/loop1 /mnt/asmdisk1
cd /mnt/asmdisk1

问题:
当尝试"vi test.txt" 同时写入内容并且已存档於其中一部Linux Server, 再於另一部Linux Server 查询, 但没有找到"test.txt"。

希望各位高手帮忙, 感激万分。

同一个image file 两部机同时mount, 啲data 唔会in sync, 唔应该咁用。