Richard Elling schrieb: > Tobias Exner wrote: >> Hi John, >> >> I've done some tests with a SUN X4500 with zfs and "MAID" using the >> powerd of Solaris 10 to power down the disks which weren't access for >> a configured time. It's working fine... >> >> The only thing I run into was the problem that it took roundabout a >> minute to power on 4 disks in a zfs-pool. The problem seems to be >> that the powerd starts the disks sequentially. > > Did you power down disks or spin down disks? It is relatively > easy to spin down (or up) disks with luxadm stop (start). If a > disk is accessed, then it will spin itself up. By default, the timeout > for disk response is 60 seconds, and most disks can spin up in > less than 60 seconds. luxadm is not very helpful when I want to have a automatic MAID-solution.
The powerd of Solaris just spin down automatically the disks and the powerconsumption falls below 1 watts. ( 3,5") My tests show me that it will take roundabout 20 seconds to power up one single disk and to get access. Actually I don't know why it takes 55 seconds to spin up 4 disks in a zfs-pool, but that are my results.. > >> I tried to open a RFE... but until now without success. >> > > Perhaps because disks will spin up when an access is requested, > so to solve your "problem" you'd have to make sure that all of > a set of disks are accessed when any in the set are accessed -- > butugly. As I know, when I'm using a zfs-pool I have no possibilities to change the behavior which disk will be accessed when I just try to read or write. Do you know more? > > NB. back when I had a largish pile of smallish disks hanging > off my workstation for testing, a simple cron job running > luxadm stop helped my energy bill :-) > -- richard > > regards, Tobias _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
