[cisco-voip] high I/O Wait on one core

[Erick Wellnitz]

caroninit seems to be the biggest offender (by about 50x) in both disk
writes and cpu usage.  Am I correct in assuming this has something to do
with call detail records?


On Fri, Apr 5, 2013 at 9:02 AM, Tom Piscitell (tpiscite) <tpiscite at cisco.com
> wrote:

> Erick,
>
> You can use the FIOR utility from the CLI to identify which processes are
> writing to the disk.
>
> admin:utils fior
>       utils fior disable
>       utils fior enable
>       utils fior list
>       utils fior start
>       utils fior status
>       utils fior stop
>       utils fior top
>
> Here is a typical use case:
>
> 1. Enable the FIOR utility before/during a time of High IO Wait
>         admin:utils fior enable
>         File I/O Statistics has been enabled.
>         admin:utils fior start
>         Loading fiostats module: ok
>         Enabling fiostats : ok
>         File I/O Statistics has been started.
>
> 2. Wait a couple minutes. FIOR will poll for data every 5 seconds I
> believe. Then use utils fior top to see whats hitting the CPU the hardest:
>
> admin:utils fior top ?
> Syntax:
> utils fior top n sort_by [start=date-time] [stop=date-time]
>
>          n:            number of processes
>          sort_by:      read, write, read-rate, write-rate
>          date-time:    of the form %H:%M, %H:%M:%S
>                                    %a,%H:%M, %a,%H:%M:%S
>                                    %Y-%m-%d,%H:%M, %Y-%m-%d %H:%M:%S
> Example:
> admin:utils fior top 10 write start=2010-04-20 10:00:00 stop=2010-04-20
> 10:30:00
>
> This of course won't tell you *why* a process is hitting the disk, but it
> will at least show you who has the most read/writes. To answer the why
> question you would need to look at traces for the offending process/service.
>
> HTH,
> -Tom
>
> On Apr 4, 2013, at 5:43 PM, Erick Wellnitz <ewellnitzvoip at gmail.com>
> wrote:
>
> > Hello all!
> >
> > I have a dual 4 core IBM 7835I3 which is my publisher.   One one core of
> the first CPU the I/O Wait is through the roof.  RTMT shows that writes to
> the hard drives are at between 600 and 700 MB/s which is exponentially
> higher than the subscriber on the same model of hardware.
> >
> > Short of calling TAC is there any way to figure out what is causing the
> extremely high volume of writes to the drives?  I already stopped most
> traces and looking at the processes doesn't give any clues.
> >
> > Thanks again!
> >
> >
> > _______________________________________________
> > cisco-voip mailing list
> > cisco-voip at puck.nether.net
> > https://puck.nether.net/mailman/listinfo/cisco-voip
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20130405/8501c8ae/attachment.html>