Most energy efficient (home) setup
Jeroen van Aart
jeroen at mompl.net
Fri Apr 13 14:06:22 CDT 2012
Leo Bicknell wrote:
> But what's really missing is storage management. RAID5 (and similar)
> require all drives to be online all the time. I'd love an intelligent
> file system that could spin down drives when not in use, and even for
> many workloads spin up only a portion of the drives. It's easy to
> imagine a system with a small SSD and a pair of disks. Reads spin one
> disk. Writes go to that disk and the SSD until there are enough, which
> spins up the second drive and writes them out as a proper mirror. In a
> home file server drive motors, time you have 4-6 drives, eat most of the
> power. CPU's speed step down nicely, drives don't.
Late reply by me, but excellent points.
A combination of mdadm and hdparm on linux should suffice to have a raid
that will spin down the disks when not in use. I have used for years a
G4 system with a mdadm raid1 (and a separate boot disk) and hdparm
configured to spin the raid disks down after 10 minutes and it worked great.
I think in a raid10 this would only spin up the disk pair that has the
data you need, but leave the rest asleep. But I didn't try that yet.
What I'd like is to have small disk enclosuer that includes a whole (low
power) computer capable of having linux installed on some flash memory.
Say you have an enclosure with space for 4 2.5 inch disks, install
linux, set it up as a raid10, connect through USB to your computer for
back up purposes.
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Date: Friday, April 13, 2012 17:45:06 UTC
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