Question : Extending space for Raid 5 Server

I have ProLiant DL380 G3 Server with four hard disk (each 75.gb) configured in Raid 5.This critical Windows application running on this.There are two more hard disk slots in Server.
Shall I add two hard disks (146 gb each) in this empty slots to get more space for server.
If possible how to do this? What are the things that I want check before adding Disks?
I want to get redundancy; so what is best method- creating an array and adding disks to this array or creating another raid (mirror)?
Raid configuration utility not working in this server, so I prefer to start with Smart Start disk.
Waiting for your valuable advice.

Answer : Extending space for Raid 5 Server

tell-me:

i just re-read all of your comments. The first thing i would suggest is to make sure that your RAID card will allow for multiple arrays. some will, and some won't.

assuming your card will allow for another array, i would suggest that you install the two new drives as a RAID1 array. Shniz123 is correct in that if you do not need a RAID0 array, there is no real need for one and it seems that if all you are looking for is extra storage space, a RAID1 array will do everything you need.

if your card does not support multiple arrays, i would suggest that you take SEVERAL full backups (plus a copy of all data to a temporary store if possible) and replace your curreny RAID5 array. You will, however, need to purchase more drives (i would recommend at least two more drives) and run a larger RAID5 array.

Your other option is to get a second RAID card to run your second array. I personally like 3Ware cards.