Here's an example for SCSI disks (the main benefit vs VirtIO is
discard/unmap/TRIM support):
<disk type='network' device='disk'>
<driver name='qemu' type='raw' cache='writeback' io='threads'
discard='unmap'/>
<auth username='libvirt'>
<secret type='ceph' uuid='3fc5de60-358e-e010-93c9-bacfc9636edf'/>
</auth>
<source protocol='rbd' name='yourpool/yourrbd'>
<host name='yourmon1' port='6789'/>
<host name='yourmon2' port='6789'/>
<host name='yourmon3' port='6789'/>
</source>
<target dev='sda' bus='scsi'/>
<address type='drive' controller='0' bus='0' target='0' unit='0'/>
</disk>
You also need a VirtIO-SCSI controller to use these, which will look
something like:
<controller type='scsi' index='0' model='virtio-scsi'>
<address type='pci' domain='0x0000' bus='0x00' slot='0x04'
function='0x0'/>
</controller>
Cheers,
Simon.
On 01/07/2020 20:52, Harry G. Coin wrote:
[Resent to correct title]
Marc:
Here's a template that works here. You'll need to do some steps to
create the 'secret' and make the block devs and so on:
<disk type="network" device="disk">
<driver name="qemu" type="raw" cache="writeback"/>
<auth username="libvirt">
<secret type="ceph" uuid="3fc5de60-358e-e010-93c9-bacfc9636edf"/>
</auth>
<source protocol="rbd" name="yournamespace/yourblockdevname" index="1">
<host name="yourmon1" port="6789"/>
<host name="yourmon2" port="6789"/>
<host name="yourmon3" port="6789"/>
<host name="yourmon4" port="6789"/>
</source>
<target dev="vda" bus="virtio"/>
<alias name="virtio-disk0"/>
<address type="pci" domain="0x0000" bus="0x00" slot="0x07"
function="0x0"/>
</disk>
Glad I could contribute something. Sure would appreciate leads for the
suggested sysctls/etc either apart or as tuned profiles.
Harry
On 7/1/20 2:44 PM, Marc Roos wrote:
Just curious, how does the libvirt xml part look like of a 'direct
virtio->rados link' and 'kernel-mounted rbd'
-----Original Message-----
To: ceph-users@xxxxxxx
Subject: *****SPAM***** Are there 'tuned profiles' for
various ceph scenarios?
Hi
Are there any 'official' or even 'works for us' pointers to 'tuned
profiles' for such common uses as
'ceph baremetal osd host'
'ceph osd + libvirt host'
'ceph mon/mgr'
'guest vm based on a kernel-mounted rbd'
'guest vm based on a direct virtio->rados link'
I suppose there are a few other common configurations, but you get the
idea.
If you haven't used or know of 'tuned'-- it's a nice way to collect a
great whole lot of sysctl and other low level configuration options in
one spot. https://tuned-project.org/
Thanks
Harry Coin
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