How to implement disk allocation in a RAID10 Adaptec controller?

Question

RAID

There is an Adaptec 2405 controller, a RAID10 array of 4 disks is configured on it, and you need to sequentially change all disks in the raid, since there are reallocated sectors.
Replaced the first disk.
With the help of the arcconf utility, it is possible to view
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Logical device segment information
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Group 0, Segment 0 : Present (Controller:1,Enclosure:0,Slot:0) 9WK0RVLC
Group 0, Segment 1 : Present (Controller:1,Enclosure:0,Slot:1) 9WK0RV5Q
Group 1, Segment 0 : Present (Controller:1,Enclosure:0,Slot:2) 9WK0S03X
Group 1, Segment 1 : Present (Controller:1,Enclosure:0,Slot:3) Z1W07VCS
here new drive last:
Group 1, Segment 1 : Present (Controller:1,Enclosure:0,Slot:3)
Z1W07VCS connected drive.
But the catch is how to determine exactly how the disks are divided into pairs in raid1, from which we then get raid0 and finally raid10 ?
I can assume that since the Adaptec controller has distributed the disks into groups, Group 0, Group 1, then the newly installed disk with S / N Z1W07VCS is paired with 9WK0S03X, and now I need to change the next disk from a pair of 9WK0RVLC - 9WK0RV5Q, but I want to get confirmation this, maybe someone faced this?
Next, the second question.
If in a RAID10 array that consists of 4 1TB disks (thus, as a result, we have a 2TB logical disk), we replace all disks with 2TB in turn, we will get the same 2TB RAID10 logical disk, but the controller will see free disk space and from them it will be possible to make another 2TB array. Right?

Answer 1

I contacted the official Adaptec support service, they said that the controller will see 4TB, and you can create raid arrays of any configuration in free space, including expanding the existing raid-10 to 4TB.
about replacing the disk, I assumed correctly. I need to insert the second disk instead of one of the Group 0 disks if I want two new disks not to end up in the same raid-1 array.
At the moment, 2 of the 4 disks connected to the RAID controller have been replaced.
Only there are nuances.
The server turned off to replace the disk (of course, with hot-swap configured, you can replace the disk while it is running), and when I entered the BIOS of the Adaptec controller, I got a bunch of warnings that the RAID was in the degraded state (this is understandable, we just pulled out one disk, and inserted another, RAID should perform a rebuild, everything is logical), and offered to save the current configuration (!). I didn't save anything, just rebooted the server with Ctrl+Alt+Del, waited for the raid to sync.
Perhaps this saved me from an epic fail and a couple of sleepless nights :)

Answer 2

If all 4 disks are 2 TB, then the usable capacity will be 4 TB.
Another 1 array is likely to fail.
You can view the configuration options in the CTRL+A utility. Or with the help of software utilities.