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?
>
> Alan
>
> On Tue, Sep 28, 2010 at 8:59 AM, Eric Shubert <ejs@shubes.net
> <mailto:ejs@shubes.net>> wrote:
>
> Is there a particular elevator that generally works best with
> software raid-1?
>
> (More generally, what is the relationship, if any, between elevators
> and sw raid?)
>
> --
> -Eric 'shubes'
>
> ---------------------------------------------------
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.
--
-Eric 'shubes'
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