I have a power edge T420 that has a RAID50 setup on it. One disk failed and I am going to replace it. I learned that RAID exists on Wednesday so before I go ahead I wanted to ask someone to double check if what I plan will work. Thanks!

I've installed the command line tool and here are its outputs:

root@server:/opt/MegaRAID/perccli# ./perccli64 /c0/eall/sall show
CLI Version = 007.1910.0000.0000 Oct 08, 2021
Operating system = Linux 5.10.0-19-amd64
Controller = 0
Status = Success
Description = Show Drive Information Succeeded.


Drive Information :
=================

-----------------------------------------------------------------------------------
EID:Slt DID State  DG       Size Intf Med SED PI SeSz Model                Sp Type
-----------------------------------------------------------------------------------
32:0      0 UGood  -  111.250 GB SATA SSD N   N  512B INTEL SSDSC2BB120G6R U  -
32:1      1 UGood  -  111.250 GB SATA SSD N   N  512B INTEL SSDSC2BB120G6R U  -
32:2      2 Onln   0    3.637 TB SAS  HDD N   N  512B ST4000NM0025         U  -
32:3      3 Onln   0    3.637 TB SAS  HDD N   N  512B ST4000NM0025         U  -
32:4      4 Onln   0    3.637 TB SAS  HDD N   N  512B ST4000NM0025         U  -
32:5      5 Onln   0    3.637 TB SAS  HDD N   N  512B ST4000NM0025         U  -
32:6      6 Onln   0    3.637 TB SAS  HDD N   N  512B ST4000NM0025         U  -
32:7      7 Failed 0    3.637 TB SAS  HDD N   N  512B ST4000NM0025         U  -
-----------------------------------------------------------------------------------

EID=Enclosure Device ID|Slt=Slot No|DID=Device ID|DG=DriveGroup
DHS=Dedicated Hot Spare|UGood=Unconfigured Good|GHS=Global Hotspare
UBad=Unconfigured Bad|Sntze=Sanitize|Onln=Online|Offln=Offline|Intf=Interface
Med=Media Type|SED=Self Encryptive Drive|PI=Protection Info
SeSz=Sector Size|Sp=Spun|U=Up|D=Down|T=Transition|F=Foreign
UGUnsp=UGood Unsupported|UGShld=UGood shielded|HSPShld=Hotspare shielded
CFShld=Configured shielded|Cpybck=CopyBack|CBShld=Copyback Shielded
UBUnsp=UBad Unsupported|Rbld=Rebuild

root@server:/opt/MegaRAID/perccli# ./perccli64 /c0/dall show
CLI Version = 007.1910.0000.0000 Oct 08, 2021
Operating system = Linux 5.10.0-19-amd64
Controller = 0
Status = Success
Description = Show Drive Group Succeeded


TOPOLOGY :
========

------------------------------------------------------------------------------
DG Arr Row EID:Slot DID Type   State  BT      Size PDC  PI SED DS3  FSpace TR
------------------------------------------------------------------------------
 0 -   -   -        -   RAID50 Dgrd   N  14.552 TB dsbl N  N   dflt N      N
 0 0   -   -        -   RAID5  Dgrd   N   7.276 TB dsbl N  N   dflt N      N
 0 0   0   32:2     2   DRIVE  Onln   N   3.637 TB dsbl N  N   dflt -      N
 0 0   1   32:3     3   DRIVE  Onln   N   3.637 TB dsbl N  N   dflt -      N
 0 0   2   32:4     4   DRIVE  Onln   N   3.637 TB dsbl N  N   dflt -      N
 0 1   -   -        -   RAID5  Dgrd   N   7.276 TB dsbl N  N   dflt N      N
 0 1   0   32:5     5   DRIVE  Onln   N   3.637 TB dsbl N  N   dflt -      N
 0 1   1   32:6     6   DRIVE  Onln   N   3.637 TB dsbl N  N   dflt -      N
 0 1   2   32:7     7   DRIVE  Failed N   3.637 TB dsbl N  N   dflt -      N
------------------------------------------------------------------------------

DG=Disk Group Index|Arr=Array Index|Row=Row Index|EID=Enclosure Device ID
DID=Device ID|Type=Drive Type|Onln=Online|Rbld=Rebuild|Optl=Optimal|Dgrd=Degraded
Pdgd=Partially degraded|Offln=Offline|BT=Background Task Active
PDC=PD Cache|PI=Protection Info|SED=Self Encrypting Drive|Frgn=Foreign
DS3=Dimmer Switch 3|dflt=Default|Msng=Missing|FSpace=Free Space Present
TR=Transport Ready

My plan is to do as follows:

1. I will switch the disk off

perccli /c0/e32/s7 set offline
perccli /c0/e32/s7 set missing
perccli /c0/e32/s7 set spindown

2. I will swap the drive sitting in the tower

3. I will bring it back with

perccli /c0/e32/s7 set spinup
# perccli /c0/e32/s7 set online # idk in what order this one should go
perccli /c0/e32/s7 insert dg=0 array=1 row=2
perccli /c0/e32/s7 start rebuild
perccli /c0/e32/s7 show rebuild

That's it.

So as you can see I have pretty much just collected a bunch of commands from the manual and I have lined them up in what I hope makes sense, but to be honest I have no idea what am I doing. So if someone can help me out with it that would be much appreciated!