PowerEdge 2500 3drive Raid5 Array - Disk 2 Degraded

Just more of a paranoid question then any other.  I have a client with an 8 year old Dell Poweredge 2500 Server with a Perc 3/DI controller.

We're replacing this server in a week but of course I just noticed yesterday that disk3 is blinking amber and the array is degraded.

The drives currently installed are Quantum Atlas 10K III U160s 36gb drives.  I don't have any in stock but do have a Seagate Cheetah U320  36g 10k Drive...   Will this work?   With the U320 downgrade to 160?

Secondly,  what is the correct approach to rebuilding the drive?  Do I just hot swap it?  Will the rebuild happen automatically?

I've never worked with a PERC3 and it's a production server so I don't want to take any chances.

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In RAID environment you should use disk with same characteristics, but if you're in trouble you could try different disks. Sometimes Dell send me different disks and PERC uses it as well.
My doubt is about your degraded array with another failing disk, do a backup soon!

When you insert a new disk, PERC starts to rebuild the array automatically; you can check the status using hpps://yourIPserver:1311 (you must have Dell Agents installed).
It is not recommended, but you should not have any trouble mixing and matching hard drives - just makes sure the hard drive you install is equal in size (not just GB, but bytes) or larger.
The U320 disk has a 99% chance of working on the U160 controller without issues. Since you already have the part in stock go for it.
Worse case make sure you backup that data every night - especially if your running with one disk down on the raid 5. It is really unlikely that another disk will fail within the next month and you should be on the new server by then.
Finally if the disk does work it should rebuild automatically. You can always boot into the card interface to verify it, but you should see the disks going crazy with flashing lights within a minute of putting the drive in.
I hope this helps. Good luck.

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Fluid_ImageryAuthor Commented:
Just to ask the dumb question,  all I need to do is pull the failed drive out of the server and put the new one in?
Yes, you are correct.
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