On Tue, Sep 28, 2010 at 11:15 AM, Eric Shubert <e...@shubes.net> wrote:
> Alan Dayley wrote: > >> Maybe http://www.otisworldwide.com/ ? >> >> (Sorry, couldn't resist.) >> >> Side track: What does the word "elevator" mean in the context of RAID? >> Ha! >> > > In the linux kernel, the I/O scheduler is referred to as the elevator. It > can be set to one of 4 values in the 2.6 kernel using the elevator= kernel > parameter at boot time. Each block device's scheduler is determined by the > value in /sys/block/<device>/queue/scheduler > $ cat /sys/block/sda/queue/scheduler > noop anticipatory deadline [cfq] > > You can change a device's elevator on the fly by doing: > # echo deadline >/sys/block/sda/queue/scheduler > > I'm just wondering which value gives the best performance when using > software raid-1, or if the choice depends more on the type of load that's > being processed. > > Thank you, Eric. I did not know about that kernel setting. Alan
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