On Wed, Feb 26, 2003 at 05:01:32PM -0500, Lilian Feng wrote:
> I have noticed a mismatch of backup speed shown in nwadmin versus iostat -x 
> in NetWorker 6.1.3 and Solaris 8.
> We have a 2Mbps link to a remote client.
> nwadmin shows 192/154KB/s of backup speed.  iostat -x 5 shows 230-256KB/s of 
> writing speed to tape.  netstat -i -I hme0 5 shows around 2Mbps.
> If I calculate speed by using (total backup size)/duration, i get 240MB/s of 
> backup speed.
> 570MB/39m:31s = 240MB/s
> The total size and duration are from the /usr/logs/messages file.
> Any comments on the 25% difference in readings?

The nwadmin window usually underestimates the actual write speed, from what
I've seen.

You're getting 240KB/s (dividing backup size/duration), not MB/s.

After you factor in network overhead, a 2Mbit/s line like you have will get
about 200kBytes/s.  You're getting reasonable throughput.

You might want to consider adding client-side compression to make better
use of your line, if you're not already, and if your client CPU is not
overloaded.

--Joe

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