Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi Igor, because installing openstack-cinder-volume on the storage node doesn't solve the failover problem in an efficient way. More precisely, openstack-cinder-volume uses LVM with the default (and more cheaper) configuration. But LVM has a lot of problems when used in clusters. HA-LVM has problems with lvmetad service (used by openstack-cinder-volume) and CLVMd doesn't manage snapshots, a feature really useful in openstack-cinder. Drbdmanage is a good idea beacuse it manages automatically resources in drbd as logical volumes and in conjunction with the cinder-volume plugin handles also the "transport" part to the compute nodes (without pass over the cinder-volume node). The problem is that there is no documentation and more important, there are no use case guides. In a datacenter environment is important to split storage network and replication network and services on various nodes. Thank you for your support. Marco 2017-11-26 23:05 GMT+01:00 Igor Cicimov <igorc at encompasscorporation.com>: > Hi Marco, > > On 23 Nov 2017 7:05 am, "Marco Marino" <marino.mrc at gmail.com> wrote: > > Hi, I'm trying to configure drbd9 with openstack-cinder. > Actually my (simplified) infrastructure is composed by: > - 2 drbd9 nodes with 2 NICs on each node, one for the "replication" > network (without using a switch) and one for the "storage" network. > - 1 compute node with a dedicated NIC connected to the storage network > - 1 controller with openstack-cinder-volume installed on it. > > Please, review the configuration at https://www.draw.io/#G1P2uJ9Lo > Xc0bJdNRS9m2fN5cuik73t7_T > > My questions are: > 1) Using the DRBD Transport, can I connect directly compute nodes to the > drbd storage without passing through the cinder-volume node? > 2) if yes, what I have to install on each node? I suppose: > drbd9 kernel module + utils + drbdmanage on DRBD1 and DRBD2 > drbd9 kernel module + utils on COMPUTE nodes > drbdmanage on openstack-cinder-volume (???) > > 3) How should I configure openstack-cinder-volume in drbdmanage??? > (External node or whatelse?) Please note that replication network and > storage network are 2 different subnets! IPs I've used in drbdmanage when I > created the drbd cluster belongs to the replication network. Is this > correct? > > 192.168.10.0/24 = replication network > 192.168.20.0/24 = storage network > > I'm sorry, but I'm a bit confused about this configuration > > > Wouldn't you just install Cinder together with drbd on the drbd nodes? > Then you just give cinder the drbd device for its lvm to serve block > devices from via iSCSI as per usual. > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20171128/a60b58ae/attachment.htm>