On 02/14/2011 06:45 PM, Fajar A. Nugraha wrote: > 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. You can use DRBD as the PV for clustered LVM. :) -- Digimer E-Mail: digimer@xxxxxxxxxxx AN!Whitepapers: http://alteeve.com Node Assassin: http://nodeassassin.org -- Linux-cluster mailing list Linux-cluster@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cluster
