Check the hardware information
 

except reboot the RH7 system , how can I know the hardware information
1. the no. of harddisk ( how many pcs ) and what is the size of each harddisk ?
2. what is the Lan card speed , 10 / 100 or 1000 ?

Thx

dmesg would give you some information.

fdisk -l
to get the size of harddisks.

cat /proc/pci
will list all your PCI devices. If your network card is a PCI devices, then you will see what card it is in that list. If it's an ISA card, then try
cat /proc/isapnp

I don't know if it's a better solution to the lan speed question.

Regards
Martin

For the nic, unless it is onboard, there should be some dels at its back saying you have 10 or 100 connection. If you've got these, it should be a 100. However, if you've got only the link/act, it is probably 10. If it is onboard, maybe let us know what you've got in the output of dmesg or cat /proc/pci... (or search google on your own.