> > First, the simple cases, called Seagate ;-) > I have checked 3 different types of Seagate HDDs one labeled Enterprise, > one labeled IronWolf, and one labeled Exos. Non of this drives seams to > support Advanced power management (APM). > I tested the auto spin down beaver of the HDD labeled Enterprise and it > works as expected. In my last E-Mail I was a little bit confused because > all the Seagate drives often report the state “unknown”. However, now I’m > pretty sure that hdparm reports “unknown” when the drive is doing some IO, > if the drive is running but doing no IO the state “active/idle” is > reported and if the spindle has stoped the state is “standby”. > I was not able to check the auto spin down for the IronWolf and Exos until > now. > > I have found 4 HDD types that supports APM for testing. Two HGST HDDs, one > with 4 TB and one with 6 TB. A 4 TB WD drive labeled as Red Pro and a 12 > TB WD drive labeled as Gold. > I did set the APM to 127 for all 4 drives. The two HGST drives and the 4TB > WD drive did reach the state “standby”. While the 12 TB WD drive always > reported “active/idle” and never reached “standby”. > The spin down behaviour of the two HGST drives did not change when I set > the APM to 128 on all drives. Also the 12 TB WD still reports > “active/idle” permanently. Only the behaviour of the 4 TB WD drive has > changed since it seams that it can not reach the state “standby” any more. > So from 4 drives only 1 behave as the man page of hdparm suggests. > > > For now my HDD type sample size is too small to draw a final conclusion. > But I think it is possible to say that the APM setting is not so > straightforward as outlined by the man page of hdparm and you should test > this for every drive type. Maybe nice to collect the power usage during these tests with influx/prometheus? _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx
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