As I've said before on unix (Solaris) the GUI underestimates the drive
speed by about 25% (16MB/s for an LTO doing 22MB/s - as reported by iostat
this is because networker polls the drives at a low rate - presumably this
effect gets worse as the drive speeds increase. With the higher speed
drives I would use the OS's speed reporting in preference to Networkers.

On Tue, 10 Dec 2002 11:16:40 -0800, Zaigui Wang <zaigui AT YAHOO DOT COM> wrote:

>Folks,
>
>I asked this question before but did not get any
>response. I am hoping over time more and more people
>are getting this  tyep of drive and are able to play
>with it to get the optimal performance.
>
>We recently set the new library up (ATL P4000) and no
>matter how we tried, we are only seeing about
>11-15MB/s (from networker GUI). Considering the
>theoretical speed of 16/32 MB/s (native/compressed),
>this is hardly satisfying.
>
>I understand that lots of factors can contribute to
>the sustained speed on a drive. But I just cannot
>ignore the fact that we are seeing 7-8MB/s on our
>DLT7000 tape drives (compressed). SuperDLT 320
>supposedly is 3x faster.
>
>Any input?
>
>Thanks.
>
>Zaigui
>
>
>
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