[rrd-users] timestamp and manually inserting data

[Ron Peterson]

2008-01-23_11:38:51-0500 Ron Peterson <rpeterso at mtholyoke.edu>:

> # We don't really care when our time stamps begin, only that they
> # increment at one second intervals.
> i=1
> while read blocksread blockswritten
> do
>   i=$((i + 1))
>   mbsread=$(echo "scale=0; $blocksread * 512 / 1000000" | bc)
>   mbswritten=$(echo "scale=0; $blockswritten * 512 / 1000000" | bc)
>   rrdtool update $RRDFILE $i:$mbsread:$mbswritten
> done<<EOF
> $(getdata)
> EOF
> 
> This doesn't work, however.  I get an error like:
> 
> ...illegal attempt to update using time 2 when last update time is 1201069000

I made this work by setting my 'i' variable differently.  Instead of
initializing like 'i=1', I did:

i=`rrdtool last $RRDFILE`
i=$((i + 1000))

I'd still appreciate any insight into the meaning of the --start parameter though.

Best.

-- 
Ron Peterson
Network & Systems Manager
Mount Holyoke College