> Hi all, > > My friend is running a Debian 8 server with 48TB raid5 array running > fine since 2016, but suddenly it failed last night around 9PM, > reporting four drives missing. See below all devices details. > I'm suspecting his disk controller with four SATA ports failed, as the > failed drives were attached on it. So, I believe these four missing > devices (sdk,sdl,sdm and sdn) are in good shape. > However they got out of sync with the array. I'm wondering how the > array got out of sync when it was not able to access these devices ? > Can we recover the array from this failure? Possibly, as mentioned by Mikael, but there are good chances for corruption. Also, keep in mind that 13 drives in a RAID-5 and no spare isn't what I'd recommend - better use RAID-6 *and* a spare. It wouldn't have helped much here, but still, better keep redundancy high. PS: I would check cables and clean connectors with isopropanol and a clean brush to sort out connection issues. Four drives dropping out at the same time is usually just a bad cable/connection. Also - setup something like Zabbix to monitor the system so that you can get an alert once something like this happens again. roy -- Roy Sigurd Karlsbakk (+47) 98013356 http://blogg.karlsbakk.net/ GPG Public key: http://karlsbakk.net/roysigurdkarlsbakk.pubkey.txt -- Hið góða skaltu í stein höggva, hið illa í snjó rita.
