RE: [Xen-users] howto upgrade

["Robert Dunkley" <Robert@xxxxxxxxx>]

Hi,

We saw time keeping issues with the Tyan B4989 Quads Opterons, I think
it is fairly common. In the end we found using the /acpi=on (Might want
to try numa=on as well) in the bootloader and setting hpet=0 in the VM
config file reduced the problem significantly and NTP on the actual VMs
could then compensate for small differences. This problem sounds similar
to the one you are having in Dom 0, try changing the ACPI HPET option in
the bios (If the VX50 has it).

Some advice from the Xen developers suggested the ACPI HPET timer code
might be a bit shaky (3.3.1 might fix it for all I know, I'm currently
on 3.3.0). I'm still unsure how to tell the timer mode in Dom0 though.

As for upgrading with rollback, this can be done by building the new
kernel and adding it as a separate option in your bootloader (eg. Grub).
I'm quite new to Kernel building and have only just got my first builds
working so you might want to wait for advice from a more experienced
user on that.


Rob

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of SZABO Zsolt
Sent: 27 January 2009 11:09
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] howto upgrade

Hi,

I would like to ask the proper or recommended way of upgrading xen...?

I started with 3.1.0 then upgraded to 3.2.1 but now I am not able to use

the original system. Since I am not satisfied[*] with the current setup
I would try to upgrade to 3.3.1 but it would be nice if something went 
wrong I could downgrade it to 3.2.x... It is a pitty that booting the 
previous xen image does not work because of the changed libs.

[*] The problem is that under heavy load in dom0 (or IO operation like 
performing the daily backups) I get a lot of "Time went backwards, etc."

and sometimes (per 1-2 months) it crashes (freezes). The hw is a TYAN 
VX-50 w/ 4 Dual-Opteron 8220 CPUs and 4 500G WD RAID ED. discs (pairwise

in software raid1, so the total capacity is ~1TB). Unfortunately the 
onboard NV SATA controller did not work under XEN so an ADAPTEC PCI card

had to be installed.

So any hints or URLs are welcome,
--
Zsolt

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