On Tue, Feb 15, 2011 at 6:39 AM, Nikola Savic <niks@xxxxxxxxxxxxxxxxx> wrote: > > Hello, > > I need to setup cluster of 3 servers without separate storage device > (SAN). Servers should join their local hard drives to create shared storage > space. Every server in cluster has public (100Mbps) and private (1Gbps) NIC. > Private 1Gbit network will be used for exchange of data (files) on shared > storage. Additional request is that data on shared storage is highly > redundant (complete mirroring is required). > > I was wondering if following setup is possible and if anyone has any > experience or comments on it: > - Servers will export local disks of same size as iSCSI targets > - Each server will access other's two servers disk over iSCSI initiator > - CLVM will be used to set Volume Group on all 3 disks. In theory this VG > will work on all servers, because they'll have access to all disks (either > directly or over iSCSI). > - CLVM will be used to create Logical Volume with mirroring option set to 3 > (-m 3). Since there are 3 disks (physical devices) forming VG, each server > will have redundant copy of same data. > - Created Logical Volume will have GFS2 on it, so that it can be shared by > cluster. > - Web server will store web application files (scripts and photos) on > created GFS. > > If it works, this setup should provide shared storage for cluster, built > from already available local hard drives in servers forming cluster. By > using LVM mirroring, each server will have the same copy of data, which > should make cluster resistant to failure of any server. > > I was wondering, is LVM smart enough to optimize reading and use local > drive for read operations? Can LVM mirror handle one server outage? Can it automatically pick the difference when it's back on? Looks like you'd better stick with drbd. -- Fajar -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
