Date: Mon, 20 Jul 2009 17:15:46 +0200 From: Ivan Voras <ivoras@freebsd.org> To: freebsd-stable@freebsd.org Subject: Re: ZFS RAIDZ and atacontrol spindown settings Message-ID: <h421n2$1kt$1@ger.gmane.org> In-Reply-To: <4A643F5B.8080806@mapper.nl> References: <4A643F5B.8080806@mapper.nl>
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Mark Stapper wrote: > Good day, > > 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?" Good question but the answer is probably no - it really only depends on how ZFS accesses the drives; if it accesses them in sequence, you can't change it.
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