[rdo-users] Poor Ceph Performance

[Cody]

Hi Donny,

Thank you for the reply.

> What kind of images are you using?
The image used is CentOS 7 cloud image in RAW format (approx. 8GB in size).

>Also how are you uploading the images?
I was uploading the image file from the undercloud node.

Thank you very much.

Best regards,
Cody
On Mon, Nov 26, 2018 at 10:57 AM Donny Davis <donny at fortnebula.com> wrote:
>
> Also how are you uploading the images?
>
> On Mon, Nov 26, 2018 at 10:54 AM Donny Davis <donny at fortnebula.com> wrote:
>>
>> What kind of images are you using?
>>
>> On Mon, Nov 26, 2018 at 9:14 AM John Fulton <johfulto at redhat.com> wrote:
>>>
>>> On Sun, Nov 25, 2018 at 11:29 PM Cody <codeology.lab at gmail.com> wrote:
>>> >
>>> > Hello,
>>> >
>>> > My tripleO cluster is deployed with Ceph. Both Cinder and Nova use RBD
>>> > as backend. While all essential functions work, services involving
>>> > Ceph are getting very poor performance. E.g., it takes several hours
>>> > to upload an 8GB image into Cinder and about 20 minutes to completely
>>> > boot up an instance (from launch to ssh ready).
>>> >
>>> > Running 'ceph -s' shows a top write speed at 6~700 KiB/s during image
>>> > upload and read speed 2 MiB/s during instance launch.
>>> >
>>> > I used the default scheme for network isolation and a single 1G port
>>> > for all VLAN traffics on each overcloud node. I haven't set jumbo
>>> > frame on the storage network VLAN yet, but think the performance
>>> > should not be this bad with MTU 1500. Something must be wrong. Any
>>> > suggestions for debugging?
>>>
>>> Hi Cody,
>>>
>>> If you're using queens or rocky, then ceph luminous was deployed in
>>> containers. Though tripleo did the overall deployment, ceph-ansible
>>> would have done the actual ceph deployment and configuration and you
>>> can determine the ceph-ansible version via 'rpm -q ceph-ansible' on
>>> your undercloud. It probably makes sense for you to pass along what
>>> you mentioned above in addition to some other info, which I'll note
>>> below, to the ceph-users list
>>> (http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com), who will be
>>> focused on ceph itself. When you contact them (I'm on the list too)
>>> also let them know the following:
>>>
>>> 1. How many OSD servers you have and how many OSDs per server
>>> 2. What type of disks you're using per OSD and how you set up journaling
>>> 3. Specs of your servers themselves (OpenStack controller servers w/
>>> CPU X and Ram Y for Ceph monitors and Ceph Storage servers RAM/CPU
>>> info)
>>> 4. Did you override the RAM/CPU for the Mon, Mgr, and OSD containers?
>>> If so, what did you override them to?
>>>
>>> TripleO can pass any parameter you would normally pass to ceph-ansible
>>> as described in the following:
>>>
>>>  https://docs.openstack.org/tripleo-docs/latest/install/advanced_deployment/ceph_config.html#customizing-ceph-conf-with-ceph-ansible
>>>
>>> So if you let them know things in terms of a containerized
>>> ceph-ansible luminous deployment and the ceph.conf and they have
>>> suggestions, then you can apply the suggestions back to ceph-ansible
>>> through tripleo as described above. If you start troubleshooting the
>>> cluster as per this troubleshooting guide [2] and share the results
>>> that would also help.
>>>
>>> I've gotten better performance than you describe on a completely
>>> virtualized deployment using my PC [1] using quickstart with the
>>> defaults that TripleO passes using queens and rocky. Though, TripleO
>>> tends to favor the defaults which ceph-ansible uses. However, with a
>>> single 1G port for all network traffic I don't expect great
>>> performance.
>>>
>>> Feel free to CC me when you email ceph-users and feel free to share on
>>> rdo-users a link to the thread you started there in case anyone else
>>> on this list is interested.
>>>
>>>   John
>>>
>>> [1] http://blog.johnlikesopenstack.com/2018/08/pc-for-tripleo-quickstart.html
>>> [2] https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/3/pdf/troubleshooting_guide/Red_Hat_Ceph_Storage-3-Troubleshooting_Guide-en-US.pdf
>>>
>>> > Thank you very much.
>>> >
>>> > Best regards,
>>> > Cody
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