Re: [Xen-users] easy high availability storage

[Peter Braun <xenware@xxxxxxxxx>]

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.


Br

Peter Braun



2009/11/25 Fajar A. Nugraha <fajar@xxxxxxxxx>:
> On Wed, Nov 25, 2009 at 4:04 PM, Roland Frei <frei@xxxxxxxxxxxx> wrote:
>> i want to setup a easy high availability storage system for xen guest os. (1
>> pc that run xen and 2 nas for storage)
>
>
>> XEN
>>  xen provides a virtual disc for the guest os. HERE IS THE THING: instead
>> that this virtual disc is stored on one drive, is should be STORED ON 2
>> NETWORK SHARES. (something like raid1 over lan)
>
>
>> THE QUESTION
>>  is it possible to setup xen so that is uses the 2 network share to store
>> the virtual discs ?
>
>
> Short answer: yes, but if you're new to HA/cluster concept (which,
> from your questions, I assume you are) better stay away from it. It's
> complicated.
>
> Long answer: there are various approach to this problem, none of them
> are one-step-easy-to-install solution.
> Here's an approach:
> - san exports its storage as iscsi
> - server/PC imports iscsi share from both san
> - setup raid1 on server using those two iscsi imports
> Caveats:
> - need to fine-tune iscsi so that when one of the sans are down it
> doesn't wait indefinitely
> - need to fine-tune/hack Linux RAID so that when the down san comes
> back up, it will sync automatically
>
> Here's another approach: If the sans are actually an x86 server with
> lots of disk, you can setup drbd + failover cluster on it.
> Caveats:
> - need to learn drbd and cluster, which IMHO is more complicated than Xen
> - in my test setup, sometimes when a drbd node is down, the other one
> will reboot as well. Then again it's probably because I use ocfs2 on
> top of drbd. YMMV
>
> --
> Fajar
>
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>

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