<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML>
<HEAD>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=utf-8">
<META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7652.24">
<TITLE>Re: [CentOS] Xen, GFS, GNBD and DRBD?</TITLE>
</HEAD>
<BODY>
<!-- Converted from text/plain format -->
<BR>
<P><FONT SIZE=2>You can fail-over using iSCSI multi-pathing. Have the initiator log in to both targets and then setup dm-multipath to do fail-over. On the target side you could use drbd with multi primaries and there you have it, redundant storage with easy fail-over.<BR>
<BR>
-Ross<BR>
<BR>
<BR>
-----Original Message-----<BR>
From: centos-bounces@centos.org <centos-bounces@centos.org><BR>
To: CentOS mailing list <centos@centos.org><BR>
Sent: Wed Jan 02 20:15:58 2008<BR>
Subject: Re: [CentOS] Xen, GFS, GNBD and DRBD?<BR>
<BR>
On 03/01/2008, at 9:55 AM, Ross S. W. Walker wrote:<BR>
<BR>
><BR>
> Take a look at iSCSI for the storage servers. iSCSI Enterprise <BR>
> Target is what I use here and it works well for us.<BR>
><BR>
> You don't really need shared filesystems if you are doing direct <BR>
> block io to LVs or raw partitions as the Xen migration will handle <BR>
> the hand-off, but you will if you are using flat files, because of <BR>
> this I recommend using LVs or raw partitions as clustered <BR>
> filesystems will put a serious overhead on the Xen guest io.<BR>
><BR>
> -Ross<BR>
<BR>
Ross,<BR>
<BR>
I can use DRBD to mirror data between the two storage servers and <BR>
iSCSI to export the block devices, but how will iSCSI cope with <BR>
failure of one storage server?<BR>
<BR>
Can I use heartbeat and CRM to failover the host IP and iSCSI target <BR>
to the other storage server?<BR>
<BR>
Regards,<BR>
Tom<BR>
_______________________________________________<BR>
CentOS mailing list<BR>
CentOS@centos.org<BR>
<A HREF="http://lists.centos.org/mailman/listinfo/centos">http://lists.centos.org/mailman/listinfo/centos</A><BR>
</FONT>
</P>
<P></P>
<HR WIDTH="100%">
This e-mail, and any attachments thereto, is intended only for use by
the addressee(s) named herein and may contain legally privileged
and/or confidential information. If you are not the intended recipient
of this e-mail, you are hereby notified that any dissemination,
distribution or copying of this e-mail, and any attachments thereto,
is strictly prohibited. If you have received this e-mail in error,
please immediately notify the sender and permanently delete the
original and any copy or printout thereof.
</BODY>
</HTML>