On 01/07/2016 06:43 AM, Helmut Drodofsky wrote: > The Red Hat Storage Administration Guide says: > - no raid 1 > - ext4 only > is this state of the art? I'm not sure which version of the guide you're reading. The version for release 6 recommends RAID1 or RAID10, and notes that both ext4 and XFS support the discard mount option. https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html-single/Storage_Administration_Guide/#ch-ssd