There is a mess on how we configured disks on the current production WDQS servers.
- wdqs200 have a RAID controller (LSI Logic / Symbios Logic MegaRAID SAS-3 3108) but we are not using it. (I do remember a discussion with @RobH about those controllers, were the conclusion was that those controllers are low-end enough that software raid would be a better idea)
- wdqs100 are configured with software raid (raid1-lvm-ext4-srv-noswap)
- wdqs1003 / wdqs200 are configured with no raid (lvm-ext-srv)
Obviously, we should have some form of raid on all those servers. Moving all of them to raid1-lvm-ext4-srv-noswap seems like the right solution. This will require a reimage.
@RobH : could you confirm that using raid1-lvm-ext4-srv-noswap for all nodes and not the hardware raid controller is reasonable?