[HPDD-discuss] Data lost on OST

Hello, I use Lustre 2.6. I have one MDS and 2 OSS servers. When I do a ls command in a specific directory I see my files. But when I want read some them with cat command, the command is blocked. With lfs find -O <device> /my/directory i not see all files !!! Could you help me please ??? Tank you