Yes that is true host io cache crashing btrfs system. If you are disable host i/o cache system very very very slow. i can't understanda virtualisation system anything.
because recovery commands not running. only electricity corruption. not hard drive failure. all my data crashed. and can't recover. not enough documentation. data recovery firms want 6000 eur.
4 5TB virtual drive(vdi)
raid0 and btrfs.
i am using DSM 5.2-5644 Update 5
my php version "You cannot update because WordPress 5.2 requires PHP version 5.6.20 or higher. You are running version 5.5.31."
how can i upgrade php version. thank you.
php 7 or php 5.