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From Vadim Kimlaychuk <>
Subject RE: Ceph as primary storage at CS 4.3
Date Mon, 28 Jul 2014 12:59:29 GMT
1. I have read that System VM-s can't run on RBD. But the information was rather old (for Ceph
0.58) is it still valid for ACS 4.3 and Ceph 0.80.4 ??
2. When I run cloud configuration wizard just after CS install - it does not have "RBD" type
for primary storage in drop-down list. But when I launch "Add primary storage" After Zone
is configured and Pod/Cluster is defined -- I can see RBD type.  A bit confused why so?


-----Original Message-----
From: Gerolamo Valcamonica [] 
Sent: Monday, July 28, 2014 3:15 PM
Subject: Re: Ceph as primary storage at CS 4.3

Il 28/07/2014 08:43, Vadim Kimlaychuk ha scritto:
> I have a fresh install of CS4.3 and going to configure Ceph RBD device as primary storage.
I can’t see this type at drop-down list (only nfs,  clvm and shared mountpoint are available).

I use CS 4.3 on KVM and Ceph.
No problem with ceph, but I upgraded from 4.1 to 4.3, so, sorry, I've no answer for this.

>            Do I need to install libvirt on managment servers as well ?
>            Will it be a problem to work with different versions of libvirt (ubuntu 12
and 14 have different) ?

Yes there will be.

I updated hosts from Ubuntu 13.04 (libvirt 1.0.2) to 14.04 libvirt
(1.2.2) and, when in mixed environment, i had this issues:

1- User VM on 13.04 hosts migrated to 14.04 hosts with a failure rate of about 5%. In case
of failure, the result was a crash of the VM, kernel panic, and need to stop and start the
VM from Cloudstack.

1a- In some cases (another 5%, more or less) the issue was a loss of connectivity from and
to VMs. Network restarting inside the VM had no results and the solution was a VM reboot from

2- Users VM on 14.04 hosts didn't migrate to 13.04 hosts and resulted in an error like this:
Unable to migrate due to internal error process exited while connecting to monitor:
W: kvm binary is deprecated, please use qemu-system-x86_64 instead Supported machines are:
none empty machine pc Standard PC (i440FX + PIIX, 1996) (alias of
pc-i440fx-1.4) pc-i440fx-1.4 Standard PC (i440FX + PIIX, 1996) default)
pc-1.3 Standard PC pc-1.2 Standard PC pc-1.1 Standard PC pc-1.0 Standard PC pc-0.15 Standard
PC pc-0.14 Standard PC pc-0.13 Standard PC pc-0.12 Standard PC pc-0.11 Standard PC, qemu 0.11
pc-0.10 Standard PC, qemu
0.10 isapc ISA-only PC xenfv Xen Fully-virtualized PC q35 Standard PC
(Q35 + ICH9, 2009) (alias of pc-q35-1.4) pc-q35-1.4 Standard PC (Q35 + ICH9, 2009) xenpv Xen
Para-virtualized PC """

3 - Most of System VM hanged or went to panic during migration from
13.04 to 14.04 hosts.
In one case, migrating a Virtual Router resulted in lost of connectivity from and to VMs connected
to that router.
I stopped and started all migrated System VM / Virtual router to avoid further issues.

4- Once all hosts was migrated to 14.04, no additional issues resulted to me.

Hope this helps

Gerolamo Valcamonica
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