[PVE-User] KVM Guest Ubuntu goes RO-Filesystem every some night

[Eneko Lacunza]

Hi,

El 20/05/16 a las 08:19, Christopher Meyering escribió:
> Hi folks,
>
> Maybe someone of you has some idea how to get rid of my strange 
> "ro-filesytem" problem.
>
> First of all some basics:
> Proxmox runs on a potent host, powering the kvm-guests with 2 raids. 
> (1 ssd raid & 2 sas raid)
> In our pve cluster we currently run 4 identical hosts with overall 50 
> kvm guests on it.
>
> Every guest runs ubuntu server 14.04 with webservers, mysql & solr 
> services.
>
> Since 3 weeks ago some guests started to fall into ro-state root 
> filesystems at night without any noticeable reason.
> The stress on the hosts and guests is quite normal at these times and 
> the problems occure on different times between 01:00 and 06:30 in the 
> morning.
> Occurently i can see some serious cpu soft locks with over 40s stuck 
> time.

This is on the PVE hosts? What brand/model are the servers, BIOS 
version/date? (dmidecode)

If BIOS is old (pre-2010 I think), there can be power management 
problems. You can also check power management in BIOS/UEFI and limit 
power saving to see if that helps.

Cheers
Eneko

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