crossref with raid docs

howto/new-machine-cymru.md

@@ -575,6 +575,11 @@ documentation](https://www.dell.com/support/manuals/en-ca/idrac7-8-lifecycle-con
  * DSA also has [some tools to talk to DRAC externally](https://dsa.debian.org/howto/drac-reset/), but they
    are not public
 
+## Hardware RAID
+
+The hardware RAID documentation lives in [howto/raid](howto/raid), see
+that document on how to recover from RAID failures and so on.
+
 # Reference
 ## Network topoloy
 
@@ -649,6 +654,8 @@ Unfortunately, when the controller is disabled, the disks just do not
 show up at all. We haven't been able to bypass the controller so those
 instructions are left only as future reference.
 
+See also [howto/raid](howto/raid).
+
 ## Design
 
 ### Storage

howto/raid.md

@@ -35,7 +35,7 @@ with SMART output](https://wiki.hetzner.de/index.php/Seriennummern_von_Festplatt
 
 # Hardware RAID
 
-Some TPO machines have hardware RAID with `megaraid`
+Some TPO machines --particularly [at cymru](howto/new-machine-cymru) -- have hardware RAID with `megaraid`
 controllers. Those are controlled with the `MegaCLI` command that is
 ... rather hard to use.