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. > 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. 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 _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
