On a Sun (*nix) platform, you can use iostat and get read and write perf
stats.
 
the first display will be a system uptime average.....subsequent
displays will show you current active.
I snipped out the stuff other than the "rmt" entries as that's all
that's relevant......
 
if you scroll down past the first display, you can see there's ~26MB/s
writing to /dev/rmt/12cbn, and no reading.....the Netbackup catalog
backup is currently writing to that drive.
 
with the "5 30", it updates every 5 seconds, for a total of 30
intervals.
 
bash-2.03# iostat -xnp 5 30
                    extended device statistics
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device
    0.0   14.9    0.0 3089.5  0.0  0.1    0.0    6.5   0  10 rmt/2
    0.0   17.6    0.0 3394.8  0.0  0.1    0.0    6.3   0  11 rmt/9
    0.0   15.4    0.0 3221.1  0.0  0.1    0.0    6.4   0  10 rmt/1
    7.1   25.0  668.3 3590.6  0.0  0.1    0.0    1.7   0   5 rmt/4
    7.4   25.1  713.1 3332.2  0.0  0.0    0.0    1.5   0   5 rmt/5
    2.9   23.2  371.2 3310.9  0.0  0.1    0.0    1.9   0   5 rmt/13
    7.3   22.7  724.0 3432.7  0.0  0.1    0.0    1.8   0   5 rmt/11
    4.3   24.8  472.8 3356.5  0.0  0.1    0.0    1.8   0   5 rmt/12
    7.8   22.8  685.6 3295.9  0.0  0.0    0.0    1.5   0   5 rmt/3
    3.8   23.9  359.0 3310.5  0.0  0.0    0.0    1.7   0   5 rmt/10
    0.0   16.1    0.0 3225.4  0.0  0.1    0.0    6.0   0  10 rmt/8
    0.0   17.6    0.0 3423.2  0.0  0.1    0.0    6.2   0  11 rmt/7
    0.0   15.2    0.0 2982.9  0.0  0.1    0.0    6.4   0  10 rmt/6
    0.0   17.5    0.0 3381.4  0.0  0.1    0.0    5.9   0  10 rmt/0
                    extended device statistics
    r/s    w/s   kr/s   kw/s wait actv wsvc_t asvc_t  %w  %b device
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0 rmt/2
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0 rmt/9
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0 rmt/1
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0 rmt/4
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0 rmt/5
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0 rmt/13
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0 rmt/11
    0.0  823.9    0.0 26364.1  0.0  0.3    0.0    0.4   0  35 rmt/12
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0 rmt/3
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0 rmt/10
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0 rmt/8
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0 rmt/7
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0 rmt/6
    0.0    0.0    0.0    0.0  0.0  0.0    0.0    0.0   0   0 rmt/0


 
 
-- 

        -----Original Message-----
        From: veritas-bu-bounces at mailman.eng.auburn.edu
[mailto:veritas-bu-bounces at mailman.eng.auburn.edu] On Behalf Of Liddle,
Stuart
        Sent: September 18, 2006 2:28 PM
        To: Shyam Hazari; Andrew Sydelko
        Cc: jroyer at digitalmotorworks.com;
veritas-bu at mailman.eng.auburn.edu
        Subject: Re: [Veritas-bu] LTO3 minimums
        
        

        True, but that only gives you the speed that it is
reading.....how do you get the write speed?  

         

        For us, we are reading from a VTL and writing to LTO-3 drives in
an ADIC i2000 tape library.  I want to see what my write speed is.  

         

        I'm getting excellent read throughput from the VTL (averaging
about 115MB/sec)....but it looks like my average throughput on the
output side is maybe around 11MB/sec.  When I look at my gross
throughput to physical tape, it looks like vault is only pushing out
about 1TB/day (roughly 11MB/sec)!

         

        Any suggestions?

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