系统报错 smartd

Mylib

报错如下
Nov  4 12:40:15 mail smartd[2908]: Device: /dev/sda, No such device or address, open() failed
Nov  4 13:04:49 mail avahi-daemon[2754]: server.c: Packet too short or invalid while reading response record. (Maybe an UTF8 problem?)
Nov  4 13:10:15 mail smartd[2908]: Device: /dev/sda, No such device or address, open() failed
Nov  4 13:34:49 mail avahi-daemon[2754]: server.c: Packet too short or invalid while reading response record. (Maybe an UTF8 problem?)
Nov  4 13:40:15 mail smartd[2908]: Device: /dev/sda, No such device or address, open() failed

我使用的硬盘
[root@mail dev]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda3             284G  9.1G  261G   4% /
/dev/sda1             190M   34M  147M  19% /boot
tmpfs                 2.0G     0  2.0G   0% /dev/shm

sdb应该是raid
brw-r----- 1 root disk   8,     0 Sep 11 07:09 sda
brw-r----- 1 root disk   8,     1 Sep 11 07:09 sda1
brw-r----- 1 root disk   8,     2 Sep 11 07:09 sda2
brw-r----- 1 root disk   8,     3 Sep 11 07:09 sda3
brw-r----- 1 root disk   8,    16 Sep 11 07:09 sdb
brw-r----- 1 root disk   8,    17 Sep 11 07:09 sdb1
brw-r----- 1 root disk   8,    18 Sep 11 07:09 sdb2
brw-r----- 1 root disk   8,    19 Sep 11 07:09 sdb3

这是什么意思？不会是我硬盘坏了吧