While working on {T357380} I realized a strange looking RAID controller config (for each disk there is one "RAID-0" virtual drive created which then is used to create an mdadm software RAID) which turns out to be the same on all 32 hosts of that batch.
As of the procurement task T325215 those systems (Config C-1G) should not have RAID controllers at all, so I assume something went wrong during procurement as well as during provisioning as T326362 does not request HW-Raid config.
This is not ideal as it makes those 32 hosts different from the others and it does require extra care/extra steps in case of disk replacements (see T357380#9575876). We should probably re-provision those hosts with the RAID controllers configured in HBA mode or have the RAID controllers removed (if that's even possible and it makes sense to keep spares).
Opening this task to figure out what to do or at least keep the information around that probably the following steps are needed when a disk is replaced to make it appear in the OS:
```
megacli -GetPreservedCacheList -a0
megacli -DiscardPreservedCache -L'disk_number' -a0
megacli -CfgEachDskRaid0 WB RA Direct CachedBadBBU -a0
```
== GUI procedure to switch HW-RAID controller to Enhanced HBA ==
* Connect to idrac http interface through an SSH tunnel
* Go to "Storage", "Virtual disks"
* Click the dropdown for the first disk, choose "Delete" then "Apply later"
* Repeat for the second virtual disk, but choose "Apply now", then "Job queue"
* Once you see the task as complete in the Job queue, go to "Storage", "Controllers"
* Click the controller drop down, choose "Edit"
* Change "Controller Mode" to "Enhanced HBA"
* Click "Add to pending", "At next reboot"
* Perform a warm reboot from the UI
* Run `sudo cookbook sre.hosts.provision --no-dhcp --no-switch --no-users myhost`
* When asked if the RAID was modified, type modified and proceed
* You can monitor the state of the RAID configuration through the job queue
* The cookbook will probably error because the config change takes a while, just wait until the configuration step completes then type `retry`
* You can now rename and reimage the server
== Hosts with HW-RAID controller left to switch to Enhanced HBA ==
[ ] mw2420 (now wikikube-worker2091)
[x] mw2421 (now wikikube-worker2092)
[ ] mw2422 (now wikikube-worker2074)
[ ] mw2423 (now wikikube-worker2075)
[ ] mw2424 (now wikikube-worker2124)
[ ] mw2425 (now wikikube-worker2125)
[ ] mw2426 (now wikikube-worker2126)
[ ] mw2427 (now wikikube-worker2127)
[ ] mw2428 (now wikikube-worker2105)
[ ] mw2429 (now wikikube-worker2106)
[ ] mw2430 (now wikikube-worker2103)
[ ] mw2431 (now wikikube-worker2104)
[x] mw2432 (now wikikube-worker2035)
[x] mw2433 (now wikikube-worker2036)
[ ] mw2434 (now wikikube-worker2089)
[ ] mw2435 (now wikikube-worker2090)
[x] mw2436
[x] mw2437
[x] mw2438 (now wikikube-worker2037)
[x] mw2439 (now wikikube-worker2038)
[x] mw2440
[x] mw2441 (now wikikube-worker2039)
[x] mw2442
[x] mw2443
[x] mw2444
[x] mw2445
[x] mw2446
[x] mw2447
[ ] mw2448
[ ] mw2449
[ ] mw2450
[ ] mw2451