I have a gen4 2T Griad drive, and want to replace each of the 1T drives with 3T ones, (its a dual drive config). i am looking for a diagram of the wiring inside--the drives were disconnected before noting which harness to which drive
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2 drives indicates they are RAID 1, which are mirrored. 2 x 36GB = 36GB. This is an industry standard config. If you make any changes you will lose the array making it RAID 0 (no RAID - no longer hot swap), and or the complete loss of OS / data.
Instead make another logical drive for data storage. You need three or four drives to set up as RAID 5, again an industry standard config.
In a RAID 5 config, you need at least 3 drives (you can have more however). A small part of every drive is then reserved for recovery data for the other drives. So two drives together hold all the data needed to restore a 3rd drive.
The Raid Controllers in the Dell Poweredge Servers are hot swappable. So you can just pull the faulty disk and then insert a new replacement drive in the same slot (Needs to be the same type and size or bigger. However, if the disk is bigger than the other 2, then only the size of the two other disks will be used on the new drive). The Raid controller will then see that there is a new disk and automatically start the recovery process. You will be able to see this when you open the Controller software. Once the recovery is done, the RAID 5 will be fully functional again.
While one of the disks is faulty or missing the two remaining disks will continue to work, but at the severely degraded performance. After the rebuild the performance will be back to the way it was before.
The rebuild can take more than an hour, depending on the disk sizes used.
There is also an option on some Controllers to select one drive as a "spare". Then you insert one more disk and set it as spare. It will not start working unless one of the other disks in the Raid fails. That's when it is used automatically as a replacement.
If so you need to enter the RAID config (not the bios, but there will be a RAID config option during the boot process CTRL+M I believe.. but it will say on screen.) Then you need to set up the raid config, then initialise, then the drive will be detected for loading the OS.
That depends on your configuration. If the drive you want to change is installed in the peripheral bay, you have to turn the machine off before you can pull that drive out. Also: Hot-plug drive installation is not supported for systems without an integrated RAID controller or host adapter expansion card!
Look for more details on how to change a drive here.
If you have any more questions, just come back here and leave a comment - I'm happy to help.
I'm sorry, but I couldn't wade through this bunch responses, so I'm going to give you my own.
You have 2 sata drives installed, already, so you cannot add an additional one w/o a bunch of wonky adapters, so use the IDE channel. You say you have an IDE rom drive. Well, there's a reason there are 3 connections on an IDE cable. One side goes into the motherboard, the other 2 into your drives. The motherboard side is the one furthest away from the center connector. I assume you have the primary connector connected to your rom drive. the 2ndary one would be on your hdd. Why people asked you why you're doing this is beyond me. It works, you'll have an extra drive, your preference. Whatever.
Let me know if you have any more inquiries.
To answer your questions from your original post directly, the other 'ide' channel is specifically for a floppy disk You CANNOT connect an IDE cable to it. And yes, you can connect an hdd to the slave port on the ide cable.