[K12OSN] Sanity check needed before rollout

[john]

Thanks Les and John for that clarification.

John

On 5/30/07, John Lucas <mrjohnlucas at gmail.com> wrote:
> On Tuesday 29 May 2007 22:29, Les Mikesell wrote:
> > john wrote:
> > > Why does disk speed matter so much? Aren't most operations on a file
> > > server fairly small scale i/o once or twice a session i.e. opening a
> > > saved document, and writing a saved document.?
> >
> > The problem on a multi user machine is that every user wants the disk
> > head to be in a different place at the same time so seek time is often
> > more important than transfer rates. Consider what happens when everyone
> > is using a browser and every page and image each user loads is being
> > cached in their home directories.  Scsi disks/controllers can typically
> > take a bunch of commands at once and queue them up while IDE and most
> > SATA's can only do one comand at a time, waiting for CPU intervention at
> > each step.
> >
>
> The behavior ("Scsi disks/controllers can typically take a bunch of commands
> at once and queue them up..."), is known as "elevator seeking" and is a huge
> advantage of SCSI over SATA.
>
> --
>         "History doesn't repeat itself; at best it rhymes."
>                         - Mark Twain
>
> | John Lucas                          MrJohnLucas at gmail.com               |
> | St. Thomas, VI 00802                http://mrjohnlucas.googlepages.com/ |
> | 18.3°N, 65°W                        AST (UTC-4)                         |
>
> _______________________________________________
> K12OSN mailing list
> K12OSN at redhat.com
> https://www.redhat.com/mailman/listinfo/k12osn
> For more info see <http://www.k12os.org>
>