ZFS RAIDZ and atacontrol spindown settings
stark at mapper.nl
Mon Jul 20 10:08:43 UTC 2009
I am the proud user of a FreeBSD 7.2 AMD64 system housing, amongst other
things, a data server.
My "server"(It's called "Yoshi") runs FreeBSD from a mirrored system
disc, and has a zfs RAIDZ array with 4 discs for bulky data.
As it is a home server, and I work during the day, these four discs were
spinning happily all day long without much use for them doing so.
To save the world(and money) I issued the command "atacontrol spindown
1800" for all the discs in my array spinning them down after thirty
minutes of idle spinning.
So far so good, me very happy! However, when I access the array after
the discs have been spun down, it spins up the discs one after the other...
Mind you one AFTER the other, taking 4*9 seconds to do a "ls" command on
my music directory.
Content as I am with the smooth down- and upspinning of the disks, I
would like it better if the four discs would spin up simultaneously.
Thus my question: "Is it possible to \"group\" discs to be spun up
together, or to issue a custom command upon upspinning of a disc such as
to spin up other disks?"
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