Fwd: Need help

[Gk Gk]

FYI....

---------- Forwarded message ---------
From: Gk Gk <ygk.kmr at gmail.com>
Date: Wed, Dec 21, 2022 at 9:46 PM
Subject: Re: Need help
To: Daniel P. Berrangé <berrange at redhat.com>


I have just created a new vm and rechecked the disk stats. This time around
too, they seem to be different as shown below:

>From libvirt python library:
---
disk_name=sda
read_req=10501,read_bytes=263819776,write_req=1933,write_bytes=82269184
---

So the write_bytes from above amounted to 78 MB approx.

But from within the vm :
---
root at sample2:~# iostat -p sda -h
Linux 4.15.0-101-generic (sample2) 12/21/2022 _x86_64_ (1 CPU)

avg-cpu:  %user   %nice %system %iowait  %steal   %idle
           1.9%    0.0%    1.3%    0.4%    0.0%   96.4%

Device             tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
sda
                 40.45       643.6k        21.2M     217.5M       7.2G
sda1
                 40.04       637.6k        21.2M     215.5M       7.2G
----

7.2 G is far from 78 MB.   Am I doing wrong anywhere ? Btw, I did not
reboot the new vm this time



On Wed, Dec 21, 2022 at 9:30 PM Daniel P. Berrangé <berrange at redhat.com>
wrote:

> On Wed, Dec 21, 2022 at 09:26:14PM +0530, Gk Gk wrote:
> > Thanks Daniel for the response.
> >
> > I am wondering what exactly is the difference in the process for a soft
> and
> > hard reboot in the context of a kvm guest ? Can you throw some light here
> > please ?
>
> KVM will always do a soft reboot, where QEMU keeps running.
>
>
> With regards,
> Daniel
> --
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