Customer's requirements drive the solution, there are many ways to achieve HA storage. I don't know your exact setup and resources but I reckon iSCSI will be just an unnecessary overhead layer if you are using GlusterFS. You can use DRBD with a clustered file system (e.g. gfs, ocfs, ..) or with xfs/ext3/4 + NFS, you may consider using G/NBD as well. Again, the solution is driven by the customer's requirements and the available resources. GlusterFS is an awesome solution, provides HA & performance but it has some limited capabilities too, like it doesn't support POSIX ACL. Lastly my 2cents for a clustered file system, it sounds like a sexy solution but if it's deployed in a small scale (e.g. < 5 nodes) it might easily become a nightmare. For small scales HA storage without losing stability I'd recommend DRBD + XFS/EXT3/4 + NFS.
From: [email protected] [mailto:[email protected]] On Behalf Of chenzp Sent: Sunday, 3 April 2011 2:43 PM To: linux clustering Subject: Re: [Linux-cluster] Replication for iSCSI target? use drbd! 2011/4/2 Michael McGlothlin <[email protected]<mailto:[email protected]>> I'm experimenting with setting up an iSCSI target that has data replication between three nodes. Right now I'm trying Glusterfs which seems workable but I'm not sure how it'll handle it if more than one node is trying to access the same target device (1TB sparse file) at the same time. Has anyone set something like this up before and can give me some hints? I was looking at GFS before but it appeared to not do replication? DRBD seemed like a possibility but having more than two nodes sounded as if it might be an issue. Each server has dual quad-core Xeon processors, 64GB RAM, 8 2TB drives, and 10Gb Ethernet so I hope hardware won't be a limitation. We've constantly had trouble with every iSCSI, SAN, NAS, etc we've tried so I want to make something that is completely void of any single point of failure. Thanks, Michael McGlothlin -- Linux-cluster mailing list [email protected]<mailto:[email protected]> https://www.redhat.com/mailman/listinfo/linux-cluster
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