Hi Christoph, I do not have any answer for you, but I find the question very interesting. I wonder if it is possible to let the HDDs sleep or if the OSD daemons prevent a hold of the spindle motors. Or can it even create some problems for the OSD deamon if the HDD spines down? However, it should be easy to check on a cluster without any load and optimally on a Custer that is not in production, by something like: $ hdparm -y /dev/sda # spin down the hdd sda Wait a minute or so and check if the HDD is sill sleeping by $ hdparm -C /dev/sda If the "drive state is: standby” at least for several minutes, you could try to set a timeout for an automatic spinn down of the drive. e.g.: $ hdparm -S 243 /dev/sda # = spindown after (243-240)*30 minutes = 1.5 hours. You may need to change the Advanced power management (APM) level before the drive does an automatic spinn down. The current APM level can be checkt by $ hdparm -I /dev/sda | grep level > Advanced power management level: 128 You can set it by $ hdparm -B 128 /dev/sda The man page of hdparam states ..“values 128 through 254 (which do not permit spin-down)”… Best regards, Sebastian > On 12.01.2022, at 10:22, Christoph Adomeit <Christoph.Adomeit@xxxxxxxxxxx> wrote: > > Hi, > > a customer has a ceph cluster which is used for archiving large amounts of video data. > > The cluster sometimes is not used for several days but if data is needed the cluster > should be available within a few minutes. > > The cluster consists of 5 Servers and 180 physical seagate harddisks and wastes a lot of power > for drives and cooling. > > Any ideas what can be done to reduce the power usage an heat output in this scenario ? > > > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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