jimkli...@cos.ru said: > Thanks for the link, but the main concern in spinning down drives of a ZFS > pool is that ZFS by default is not so idle. Every 5 to 30 seconds it closes > a transaction group (TXG) which requires a synchronous write of metadata to > disk.
You know, it's just going to depend on your usage. On my home machine (Solaris-10U6 with U8-level patches), the drives are set to spin down after 30 minutes of idle time. I'm not certain if the root pool spins down, but the drives in the 2nd mirrored pool do spin down. This pool contains my Solaris home directory and the Samba-connected datasets for backups of other computers. It is true that I have to make sure Thunderbird and Firefox are not running in order to idle the home directory. Then the drives spin down and seem to stay that way until I wake up the display by moving the mouse or accessing the keyboard. They will also spin up when a nightly backup kicks off on one of the other systems, or if I SSH-in from work to check something. I don't do anything special other than stopping Thunderbird and Firefox when I leave the computer. I just select "Lock Screen" from the Gnome Launch menu, the screen-lock window pops up, and the display goes into power-save mode shortly after. I don't think there's anything magic about ZFS with regard to keeping the drives busy. The fancy power-saving stuff was done by Green-Bytes; There they modified ZFS to do the meta-data updates onto Flash-based SSD's separate from the rest of the usual pool drives. That way things like ZIL activity did not have to spin up a large number of data drives just to make small metadata updates, etc. Regards, Marion _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
