[ixpmanager] SFLOW Under Reporting?

[Ian Chilton]

Hi,

Stats - vdb is the data disk.

I think this looks ok - 67% idle and 3% iowait...

Ian

root at sflow:~# iostat --dec=0 -y vda vdb
Linux 5.10.0-23-amd64 (sflow.lonap.net) 24/06/23 _x86_64_ (4 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
              14       0      16       3       0      67

Device             tps    kB_read/s    kB_wrtn/s    kB_dscd/s    kB_read 
    kB_wrtn    kB_dscd
vda                  2           34           25            0    3960421 
    2915740          0
vdb               5866        14013        16371            0 1654383830 
1932780751          0

root at sflow:~# hdparm -t /dev/vdb

/dev/vdb:
  Timing buffered disk reads: 2788 MB in  3.00 seconds = 928.81 MB/sec

On 2023-06-24 11:24, Nick Hilliard (INEX) wrote:

> for reference, inex's cache flushes take ~2-3 seconds. It may be 
> happening that you're i/o bound on your RRD spool disk. If you have 
> cache flushes which take longer to run than the flush timeout, for sure 
> this would cause problems.  What's the i/o load looking like on the 
> disk? Assuming your partition is /dev/sda$something, e.g.
> # iostat --dec=0 -y sda 1 | grep --line-buffered sda
> The first column will give TPS with 1s granularity.
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