Michal Chrobak
IT Security Systems Engineer
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> Am 27.01.2017 um 11:20 schrieb Michal Chrobak:
>> I have my openvas installation on ubuntu which is virtual machine (hosted od
>> arch and kvm) with vmdk disk. I check this disk with badblocks:
>> user@openvas:~$ sudo poweroff
>> Connection to 192.168.121.253 closed by remote host.
>> Connection to 192.168.121.253 closed.
>> [mchrobak@michalc_lin] ~ $ sudo badblocks -nvs kvm/openvas.vmdk
>> Checking for bad blocks in non-destructive read-write mode From block
>> 0 to 7808703 Checking for bad blocks (non-destructive read-write test)
>> Testing with random pattern: done Pass completed, 0 bad blocks found.
>> (0/0/0 errors)
>>
>> It looks like vmdk and disk of host OS is ok (I have SSD disk, buy
>> year ago)
>
> frankly "badblocks" on a virtual disk image should dot what exactly?
>
> what about read the output of "dmesg" and whereever Ubunto writes the global
> syslog at times where probles appear?
>
> look in your systemlogs on the host and the virtual machine, in the best case
> the was only concurrency from other guests and you would see something like
> "[ 1985.288632] hrtimer: interrupt took 2895550 ns" or disk timouts in the
> guest
>
> disk timeouts are happening here regulary when the host does it's weekly
> raid-check and the backup vm it's monthly rsync --checksums over 1 TB btrfs
> compressed data on a LUKS encryption layer at the same time
>
> but that's not the production host
I used badblocks to check part of my physical disk where is openvas.vmdk.
I run dmesg -w on guest os and host os, when executing openvas-scap-sync again.
No logs reported.
VM with openvas is on my notebook, where I also have second running VM (Win10).
Some time ago I was checking my disk i/o with munin and this wasn't my
bottleneck.
What I want do next, is change disk format from vmdh to qcow2/raw and/or change
kvm disk driver from VirtIO to IDE/SATA.
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