[clug] iSCSI and shared filesystems

[Adam Baxter]

I'm interested in how you set up a Linux-based iSCSI "host" (I think the
terms are different here?). I know my Windows systems can mount drives from
an iSCSI server, but looking around leads to software with large price-tags.

On Fri, Apr 23, 2010 at 12:50 PM, Steve Walsh <steve at nerdvana.org.au> wrote:

> Steve Jenkin wrote:
>
>> Anyone using an iSCSI back-end and sharing filesystems across multiple
>> systems?
>>
>>
> Guilty
>
>  I want to run a database (Postgres of MySQL) as a XEN guest and be able to
>> live migrate to another host.
>>
>>
> yup, I've done that with a Xen VM running on an iSCSI export shared across
> a pseduo-cluster of machines
>
>  Strongly prefer using simple techniques, like NFS.
>> We are looking at buying storage appliances and what we can afford come
>> with iSCSI.
>>
>>
> Doing it with NFS has issues, iSCSI is much nicer
>
>  Will a XEN guest Just Work with iSCSI to a back-end?
>> [Two volumes, one for Data and one for Logs. backup/restore separately if
>> needed]
>>
>>
> Yes
>
>  Will the live migration of the "DB in a VM" from host to host with iSCSI
>> mounted Filesystem (I'd prefer ext3) Just Work as well?
>>
>>
> Edit config file appropriately, then use xm migrate <vm name> on machine B
> to grab a VM from machine A. provided both machines can see hte config file
> and the image/LVM backend, it "Just Works".
>
>  For extra credit, can I NFS export the DB filesystems out of the
>> DB-in-a-VM and have it work seamlessly over the Live Migrate?
>> [The IP number has to go with the VM]
>>
>>
> Ugly, and dangerous, but the whole idea of migrating VM's is that the only
> that changes is the host it's running on (ala ESX migrate.
>
> For those "not in the know", I'm currently packing up in Melbourne to come
> back to Canberra, so once I'm settled I'm happy to give a CLUG talk on the
> matter, or, if it's more pressing, Catchup over a coffee or a beer and
> explain the way it works.
>
> --
> --==--
> Steve Walsh, RHCE
> Some random guy who does things with linux and conference networks
>
>
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