No valid partition?

Hi,

I'm running asterisk over my linode… today it raised very very slow… i checked everything memory, clients, trunks and so on… but the disk check returned this:

[root@li24-121 ~]# fdisk -l

Disk /dev/xvda: 10.7 GB, 10737418240 bytes

255 heads, 63 sectors/track, 1305 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/xvda doesn't contain a valid partition table

Disk /dev/xvdb: 272 MB, 272629760 bytes

255 heads, 63 sectors/track, 33 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk /dev/xvdb doesn't contain a valid partition table

what can I do?

Kind regards

Christian