Fwd: Need help

[Gk Gk <ygk.kmr@xxxxxxxxx>]

FYI....

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

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@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@xxxxxxxxxx> 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
--
|: https://berrange.com      -o-    https://www.flickr.com/photos/dberrange :|
|: https://libvirt.org         -o-            https://fstop138.berrange.com :|
|: https://entangle-photo.org    -o-    https://www.instagram.com/dberrange :|