----- Original Message ----- From: "Maor Lipchuk" <mlipchuk@redhat.com> To: "rkoch" <rkoch@rk-it.at> Cc: "users" <users@ovirt.org>, "Nir Soffer" <nsoffer@redhat.com> Sent: Sunday, September 16, 2018 11:27:44 AM Subject: Re: [ovirt-users] LVM Mirroring

On Thu, Sep 13, 2018 at 9:59 PM, René Koch < [ mailto:rkoch@rk-it.at | rkoch@rk-it.at ] > wrote:

Hi list,

Is it possible to use LVM mirroring for FC LUNs in oVirt 4.2?

BQ_BEGIN I've 2 FC storages which do not have a replication functionality. So the idea is to create a LVM mirror using 1 LUN of storage 1 und 1 LUN of storage 2 for replicating data between the storages on host level (full RHEL 7.5 notoVirt Node). With e.g. pacemaker and plain KVM this works fine. Is it possible to have the same setup with oVirt 4.2?

BQ_END

(Adding Nir) Are you asking that in relation to support disaster recovery for oVirt setup? I'm not sure if it will help you with what you are lookiong for, but have you tried to look into Gluster Geo replication: [ https://docs.gluster.org/en/v3/Administrator%20Guide/Geo%20Replication/ | https://docs.gluster.org/en/v3/Administrator%20Guide/Geo%20Replication/ ]

Thanks a lot for your answer. It's more HA then disaster recovery. If 1 storage is down, it should be possible to use the second one without a downtime. So Geo repolication of Gluster isn't really what we are looking for. The storages are also located in 2 different buildings with redundant network and FC connections and low latency. According to your answer I guess LVM mirroring isn't possible, right? Do you think using the FC LUNs as Gluster bricks could be a reasonable solution? We have 2 storages with multiple LUNs, 4 oVirt hosts and 2 atm non used hosts, so a distributed replicated volume with arbiter or replicated with arbiter could also be possible to replicated the 2 storages, I think. But I'm concerned about performance, as I don't have good experience with Gluster on VMware when using 1 VMDK (hosted on a NetApp storage with 10K SAS disks), but good experience with Gluster when using 12 (or 24) local SATA disks in a host. So I fear that 1 LUN from a storage (ZFS storage with a pool of many disks) is not as good as 12 local disks in a storage.

BQ_BEGIN Thanks a lot.

Regards, René

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