Re: [Xen-users] Xen and iSCSI - options and questions

[Antibozo <xen-users@xxxxxxxxxxxx>]

On 2008-08-04 22:02, jpranevich@xxxxxxxxxxx wrote:
> I have a small Xen farm of 8 dom0 servers with 64 virtual machines running 
> para-virtualized and this has been working great. Unfortunately, I've hit a 
> limit: my iSCSI hardware supports only 512 concurrent connections and so I'm 
> pretty much at the limit. (Wish I would have seen that problem sooner!)
[snip]
> 2. "Just-in-time" iSCSI connections from Xen. I found that SuSE's Xen seems to do this 
> with a "block-iscsi" script in /etc/xen/scripts, but it's written for 3.0 and doesn't 
> seem to work in 3.2. The  trick is that I'm doing all of my Xen management through the XMLRPC API 
> and I don't see any way to do iSCSI mounts there, so I suspect that their Xen 3.0 workaround 
> doesn't actually mesh with Xen 3.2's new way of doing things? (Otherwise, there would be a way to 
> do it through the API.)
As with the drbd problem I was having, this is a possible application 
for a qemu-dm wrapper.
You could try modifying the qemu-dm wrapper I wrote for drbd to do ISCSI 
connect/disconnect instead of the drbd-related stuff. This is 
encapsulated in the &setup and &cleanup subs. See the recent threads 
named "Centos 5.2 using LVM -> DRBD 0.82 -> Xen" and "drbd 8 
primary/primary and xen migration on RHEL 5". This wrapper was written 
against Xen 3.0, not 3.2, so I don't know if some qemu-dm semantics have 
changed in a way that would break the basic design. Also, I wrote that 
script for HVMs and it remains untested with PVMs.
--
Jefferson Ogata : Internetworker, Antibozo

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