Online does that on C14 (https://www.online.net/en/c14) IIRC, 52 spining disks per RU, with only 2 disks usable at a time There is some custom hardware, though, and it is really design for cold storage (as an IO must wait for an idle slot, power-on the device, do the IO, power-off the device and release the slot) They use 1GB as a block size I do not think this will work anyhow with Ceph On 06/11/2017 23:12, Simon Leinen wrote: > The last paragraph contains a challenge to developers: Can we save more > power in "cold storage" applications by turning off idle disks? > Crazy idea, or did anyone already try this? > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com