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Re: [Xen-users] cluster filesystems

  • To: xen-users@xxxxxxxxxxxxxxxxxxx
  • From: Brock Edward Palen <brockp@xxxxxxxxx>
  • Date: Tue, 11 Apr 2006 12:35:20 -0400
  • Delivery-date: Tue, 11 Apr 2006 09:37:37 -0700
  • List-id: Xen user discussion <xen-users.lists.xensource.com>

Ralf Schenk wrote:
Peter Fokkinga schrieb:
If you have different physical servers that need a shared
storage (for performance or high availability reasons) then,
as far as I know, you need to spend big money on a SAN, or
iSCSI, etc.

Hello !

"Big money" is very relative. If you already habe Gigabit Ethernet
Infrastructure for your servers at least you can use the software
implementation of the Enterprise ISCSI Target (IET)
The best idea i have come up (though i wont be able to try it for some time) with with minimal patching is this:
Use ocfs2 as file system,
Use nbd+md to make a "networked raid"
use iSCSI to export this network raid to Xen parent hosts,
My question to those of you with better know how:
Will this allow live migration (assume yes as now because of the "real" block device shown by ocfs2) Will domU's living on the file system survive a file system node failure? (this is the who point of this thread)
If you don't want to configure and setup the software yourself you could
buy http://www.open-e.com/. This is a Flash-DOM that fits in the IDE
Port of a fileserver and turns this fileserver into an managable ISCSI
Target (it is Linux based). (Ranges from about 300$ to 800$)

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