raid on server

I have a old Server with 2x SAS 73gb  hard disk and raid created. Windows 2012 installed on it, now i have a Problem not enough hard disk free space. There are two more free hard disk Slot on the Server.

i bought 2 x the same SAS hard disk . can i install These new hard disk without RAID and Windows delete?

Thank you so much for your help
ismail isoAsked:
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JohnBusiness Consultant (Owner)Commented:
You would have to see if the RAID controller was configured for additional drives. If you try to add the drive outside of RAID the BIOS would need to support it.

Try it the second way and see if you can turn it on.
ismail isoAuthor Commented:
can i add both new hard disk to the existing RAID?
JohnBusiness Consultant (Owner)Commented:
Only if the controller supports it and was configured that way it depends on the controller. Some won't and some will
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JohnBusiness Consultant (Owner)Commented:
Since the server is older, and the RAID is older (RAID 5 and may be software RAID - who knows), it may be faster to back up the server, install new drives and make a new (larger) RAID array.
yo_beeDirector of Information TechnologyCommented:
What you have is a RAID 1 (MIRRORED).  You can not add or change this without taking a full image backup, destroy the RAID and recreate a newer RAID 1 with larger HDD.  Since you said you have free drives You can add them to you server (If they are supported), initialize and format.  Since you have two drives and you may want some fault tolerance, you would have to create a second RAID 1 for these new drives.  
Once created you can move data to this new vol and you should be set.  

You did not highlight what type of role this server is serving.  If it is a file share server I would move the entire share to this new VOL.
Create a RAID1 in the RAID controller.  

WIndows will see it as a new disk in disk management

Set the old disk and the new disk as a dynamic disk

right click the volume on the old disk and extend it (it will allow you to span it to the second disk)

This spans your data across the two disks.  

It is more difficult to get the data out in a Disaster recovery situation, but if you have good backups etc, it's not really a worry.  

If the disks are all close to the same size, when you have the time, backup the system, delete all RAID volumes in the RAID controller and create a RAID 10 (2 * RAID1 striped as RAID0)

This will increase the speed, but give you the same capacity and you will need a minimum of 2 failed disks to kill the array.  In some circumstances it will survive 2 disk failures and need a third to send you scuttling off to recover from backup.
To add to prior advice, make/model of server, controller type.

Depending on where the data consuming the space, and what the system does would help identify a course of action suitable to your situation, setup.

Provided the raid controller includes options to expand ...
Often, raid controllers can use larger drives as replacements, I.e. Using 146GB drive replacing I've of the 73GB, allowing the array to rebuild, then replacing the other 73gb with the larger drive
once the raid rebuilds, the volume on the controller now has unallocated space.....

Adding the new one you purchased, and making sure you have a good backup, the controller may support a transition from raid 1 to raid 10
After that, you would need to use diskpart to expand/resize......

Has thought been given to getting a newer system through purchase of a pre-owned.system that includes higher storage,

Depending on the age of the server, it could ....
PowerEdgeTechIT ConsultantCommented:
Sorry guys, it really took 6 posts to ask him for his server/controller model and his configuration (thanks Arnold)? EVERYTHING depends on it. Add drives as non-RAID drives, either on the controller or the motherboard? Maybe, depends on the system/controller. Add drives to existing array to expand (from RAID 1 to RAID 5, going from 73GB of storage to 219GB)? Maybe, depends on the server/controller. Replace the drives in RAID 1 with larger ones (either with or without a backup/restore or on the fly)? Maybe, depends on the server/controller.

It could be an "old" 4-bay PE 1950 with a SAS 5/i controller - non-RAID, so it would be mirrored in the OS. Could be a SAS 6/iR which can do two RAID 1's, but does NOT support expansion or RAID 5. The PERC 6 doesn't support non-RAID, so a single-disk RAID 0 would be needed for a single disk. PERC's don't support migration to or from RAID 10/50/60, etc. These are Dell options because that is what I'm most familiar with, but the point is that every brand and controller will have its rules and capabilities. He also said he got the same size drives as the others, so replacing the drives with larger ones is not what he is after.

ISMAIL ISO: You should take NO advice until after you have given us your server model and RAID controller model. All of these posts could be wrong, or all could be right, or some may be right and some wrong. These details aren't trivial, we can't answer your question without them, because your question isn't generic. It also isn't clear what you'd like to do: add drives as non-RAID drives? add drives in a new/separate RAID 1? add drives to the array to expand it (maybe the best option if you are simply out of space, if it is possible with your configuration)?

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ismail isoAuthor Commented:
thanks ,this the explanation
yo_beeDirector of Information TechnologyCommented:

How is the comment from PowerEdge a solution.  He highlighted variables that were not asked and there was not follow up.
PowerEdgeTechIT ConsultantCommented:
Every one of our responses were conjecture, at best.
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