Disk I/O Statistics on Debian

Hi, I'm monitoring a Debian Server using Appmanager 7, but the Disk I/O Statistics give me this report:

Devices Transfers/Sec Writes/Sec Reads/Sec Threshold
6.48 - - - Unknown
6.43 - - - Unknown
7.43 - - - Unknown
2.99 - - - Unknown
2.98 - - - Unknown
2.97 - - - Unknown
3.37 - - - Unknown
2.96 - - - Unknown
3.36 - - - Unknown
2.95 - - - Unknown
2.94 13 719250 78 Unknown
2.93 - - - Unknown
3.33 - - - Unknown
2.92 - - - Unknown
3.32 - - - Unknown
2.91 - - - Unknown
3.31 - - - Unknown
3.96 - - - Unknown
2.90 - - - Unknown
4.31 - - - Unknown
4.30 - - - Unknown
6.39 - - - Unknown
5.97 - - - Unknown
5.96 - - - Unknown
6.36 - - - Unknown
5.95 - - - Unknown
4.90 - - - Unknown
5.94 - - - Unknown
5.93 - - - Unknown
6.32 - - - Unknown
6.97 - - - Unknown
5.91 - - - Unknown
2.89 - - - Unknown
3.29 - - - Unknown
2.88 - - - Unknown
3.28 - - - Unknown
2.87 - - - Unknown
2.86 - - - Unknown
2.85 - - - Unknown
3.25 - - - Unknown
3.89 - - - Unknown
3.23 - - - Unknown
3.22 - - - Unknown

My question is: What kind of devices are this? I'm also monitoring a CentOS server, Solaris and the devices are OK...

regards
Israel