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Re: [Xen-API] Alternative to Vastsky?

To: xen-api@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-API] Alternative to Vastsky?
From: George Shuklin <george.shuklin@xxxxxxxxx>
Date: Wed, 20 Apr 2011 02:21:17 +0400
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I think we shall split this to three different scenarios:

1) local storage redundancy of local storage within terms of single host (e.g. software RAID support, I think this require a little tweak of installer to create RAID1 instead plain /dev/sda installation) 2) local storage redundancy within pool with limited host replication (primary/primary DRBD between two XCP hosts, similar to current /opt/xensource/packages/iso shared ISO SR) 3) Supports for external storage supports replication and clustering and many other enterprise-level buzzwords.

Most interesting is third.

Right now I have plans to test iscsi over DRBD with muplipath to both iscsi initiators (never test this, but it may be interesting), alternative is corosync/pacemaker clustering for NFS/ISCSI + DRBD...

On 20.04.2011 02:10, Tim Titley wrote:
Has anyone considered a replacement for the vastsky storage backend now that the project is officially dead (at least for now)?

I have been looking at Ceph ( http://ceph.newdream.net/ ). A suggestion to someone so inclined to do something about it, may be to use the Rados block device (RBD) and put an LVM storage group on it, which would require modification of the current LVM storage manager code - I assume similar to LVMOISCSI.

This would provide scalable, redundant storage at what I assume would be reasonable performance since the data can be striped across many storage nodes.

Development seems reasonably active and although the project is not officially production quality yet, it is part of the Linux kernel which looks promising, as does the news that they will be providing commercial support.

The only downside is that RBD requires a 2.6.37 kernel. For those "in the know" - how long will it be before this kernel makes it to XCP - considering that this vanilla kernel supposedly works in dom0 (I have yet to get it working)?

Any thoughts?



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