We got the problem with two Dell PowerEdge R310 Servers both with a Dell PERC H700 Controller running Sophos UTM 9.409 as a Software-Appliance and in a Hot-Standby-Cluster where one Server is the Slave and cannot be reached from the network without workarounds. On a closed system this is more a problem. You can even create a cronjob which calls the CLI tool and check the health and report back if it's critical. ![]() ![]() You have to check which controller you have and choose the megacli or storcli version which supports it. On a standard Linux this is not a problem. In case of the Dell PERC/LSI MegaRAID controllers (i'll call them "HWRAID" from now on) you want to use the megacli or the newer storcli tools to manage the controller and monitor it's health from the OS-layer. When you've installed the OS, you're mostly fine with it but you have to monitor it and therefore you need another tool. When you're done you can just boot normally and install an OS on this RAID-Disk which appears to be a single disk for the OS, as long as your OS has a driver for the controller. Most controllers can be configured after the BIOS POST using some kind of keystroke to get into the controller management "BIOS" to setup your hardware RAID and the disks and all kinds of parameters. ![]() When using a Hardware-RAID like (in this example) the Dell PowerEdge RAID-Controller, or Dell PERC which is essentially a rebranded LSI MegaRAID Controller, you need a driver for it and tools to setup and monitor them. So what's the problem with monitoring RAID-Systems at all? When you're using a Software-RAID like Linux RAID System you already using the same tools for setting up the RAID and monitoring them, like mdadm. This is a somewhat special post this time for a somewhat narrow audience but my intention was splitted into creating a reminder for myself and to show how you can even monitor things that are normally closed for manual configurations like the Sophos UTM and to generally show you how patience and the will to succeed can help you solve problems that appear to be hard to solve at all.
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September 2023
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