Re: [Xen-users] easy high availability storage

[Peter Braun <xenware@xxxxxxxxx>]

Hi,

its not my document.

Actually Ive tried to install H/A SAN according do this document but
without success.

Am looking for opensource solution of H/A SAN - and this is close to my goal.


The basics:

1)    2 machines with some HDD space synchronized between them with DRBD.

2)    Now am little bit confused what shall I use above the DRBD block device?
       - some cluster FS like OCFS2 or GFS?
       - LVM?

3)    create files with DD on cluster FS and export them with iSCSI?
       create LVM partitions and export them with iSCSI?

4)    how to make iSCSI target highly available?
       - configure   iSCSI on virtual IP/another IP and run it as HA service
       - configure separate iSCSI targets on both SAN hosts and
connect it to Xen server as multipath?

5)    hearbeat configuration

VM machines with iSCSI HDD space on SAN should survive reboot/non
availability of one SAN hosts without interruption nor noticing that
SAN is degraded.

Is that even possible?


Thank for your comments


Peter Braun

2009/11/26 Fajar A. Nugraha <fajar@xxxxxxxxx>:
> On Wed, Nov 25, 2009 at 5:01 PM, Peter Braun <xenware@xxxxxxxxx> wrote:
>> Hi,
>>
>> take a look at this document
>>
>> http://communities.vmware.com/servlet/JiveServlet/previewBody/10964-102-2-9835/ha_san_how-to.pdf;jsessionid=12BC07515EE5DB61AEFA58BA9251110D
>>
>> Its describing building highly-available SAN iSCSI storage on ubuntu.
>
>
> It's great to see a how-to for this kind of setup, but here's two
> comments from me:
> - using GFS2 with fence "manual" is, AFAIK, asking for trouble. One of
> the reasons I chose OCFS2 is that it can work without fencing (at
> least better than GFS), and it can automatically reboot itself when it
> detects "something wrong that can cause inconsistency" .
> - if you're sharing using iscsi target, it might be easier (and also
> much better performance) to simply use LVM-backed LUNs instead of
> file-backed LUNs. Thus you only need clvm.
>
> If you've already implement this setup and have good result (e.g. it
> works fine when you yank some power cords or ethernet cables) please
> share your experience :D
>
> --
> Fajar
>

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users