Re: [Xen-API] RE: [Xen-users] Re: [XCP] cdrommon issue

[<cluster@xxxxxxxx>]

Hi George,

thanks for contributing.

I do not think it is the problem. My pool is made of 3 Physical hosts. 2
Dell 2950 and 1 1950. Thi problem affects only 2950.

The storage is shared and external connected by fibre channel.

I think that the problem is the cdrom hardware. Give a look to this:

http://forums.citrix.com/thread.jspa?messageID=1475962

Cheers,
Francesco

On Wed, 18 Aug 2010 18:18:17 +0400, George Shuklin
<george.shuklin@xxxxxxxxx> wrote:
> I think, this can be hardware problem. Check drives health (if drives
> are not in hardware RAID, use smartctl from smartmontools), run simplest
> dd if=/dev/drive_name of=/dev/null bs=64k to see if all sectors of disk
> are accessible.
> 
> 
> Ð ÐÑÐ, 18/08/2010 Ð 15:22 +0200, cluster@xxxxxxxx ÐÐÑÐÑ:
>> Hi Dave,
>> 
>> thanks a lot for your answer.
>> 
>> I tried to comment out cdrommon line from xenservices, i didn't reboot
>> the
>> machine instead i restarted xen-api by using xe-toolstack-restart.
>> 
>> After restarting toolstack, as always, 2 processes VGS first and, after
>> killing it, LVM second consume 99% of cpu!
>> 
>> This problem is the same that affect the operation of live migration and
>> startup/poweroff and that jeopardize the possibility to restart the
>> physical host.
>> 
>> Do you know a safe way to restart cdrommon without restarting the
>> physical
>> server? Where can i submit the bug and should i report any other
>> information?
>> 
>> Many thanks and regards,
>> Francesco 
>> 
>> 
>> On Wed, 18 Aug 2010 13:42:33 +0100, Dave Scott
<Dave.Scott@xxxxxxxxxxxxx>
>> wrote:
>> > Hi,
>> > 
>> > I've heard other reports of cdrommon going crazy but I don't think
>> > anyone
>> > has filed a bug yet. Can you try commenting it out from
>> > /etc/init.d/xenservices?
>> > 
>> > Cheers,
>> > Dave
>> > 
>> >> -----Original Message-----
>> >> From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-
>> >> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of cluster@xxxxxxxx
>> >> Sent: 14 August 2010 17:23
>> >> To: xen-users@xxxxxxxxxxxxxxxxxxx
>> >> Cc: gallo@xxxxxxxxxx
>> >> Subject: [Xen-users] Re: [XCP] cdrommon issue
>> >> 
>> >> 
>> >> Hi all,
>> >> 
>> >> this problem is still present also in XCP 0.5
>> >> 
>> >> After 5 or 6 days of phisical server normal running, the process
>> >> cdrommon
>> >> start to consume about 97% of cpu causing VMs to become unresponsive.
>> >> 
>> >> When I kill the process (kill -9 [cdrommon_pid]) operation like
>> >> migrate
>> >> or
>> >> start or stop VMs became impossible.
>> >> 
>> >> Is there a safe way to restart cdrommon?
>> >> 
>> >> My hardware is DELL PowerEdge 2950. Is there already a bug
submission?
>> >> 
>> >> Thanks for any help, this bug make the system very unstable.
>> >> 
>> >> Cheers,
>> >> Francesco Gallo
>> >> 
>> >> 
>> >> On Thu, 22 Jul 2010 16:25:10 +0200, "Francesco Gallo"
>> >> <gallo@xxxxxxxxxx>
>> >> wrote:
>> >> > Hi all,
>> >> >
>> >> >
>> >> >
>> >> > Sometimes the process cdrommon use 99,8% of CPU and the result is
>> >> that
>> >> all
>> >> > vms becames very slow.
>> >> >
>> >> >
>> >> >
>> >> > I killed the process and now everything is fine but I can't live
>> >> migrate
>> >> > VMS.
>> >> >
>> >> >
>> >> >
>> >> > I found this problem also in this citrix thread:
>> >> >
>> >> >
>> >> >
>> >> > http://forums.citrix.com/thread.jspa?messageID=1475962
>> >> >
>> >>
<http://forums.citrix.com/thread.jspa?messageID=1475962&tstart=0#147596
>> >> 2>
>> >> > &tstart=0#1475962
>> >> >
>> >> >
>> >> >
>> >> > My XCP version is still 0.1.1
>> >> >
>> >> >
>> >> >
>> >> > Any solution?
>> >> >
>> >> >
>> >> >
>> >> > Regards,
>> >> >
>> >> > Francesco Gallo
>> >> 
>> >> _______________________________________________
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>> >> Xen-users@xxxxxxxxxxxxxxxxxxx
>> >> http://lists.xensource.com/xen-users
>> 
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> 
> 
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