Re: [Xen-API] xcp and minimum memory

[George Shuklin <george.shuklin@xxxxxxxxx>]

It's actually trivial stuff for everyone, who know xapi - dom0 is almost same as any other domain.

And normal use path do not assume usage of dom0 as desktop (xapi is pure server environment and I can't say which kind of problems you will met).

28.09.2012 11:38, Lyn Amery ÐÐÑÐÑ:

Thanks, the "xe vm-memory-target-set" worked. ÂA bit clunky, but at least I can finally move on from here. ÂPerhaps a less manual solution will present down the track.

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From: "George Shuklin" <george.shuklin@xxxxxxxxx>
To: "Lyn Amery" <lyn@xxxxxxxxxxxxxxxxxxxx>
Cc: xen-api@xxxxxxxxxxxxx
Sent: Friday, 28 September, 2012 2:39:31 PM
Subject: Re: [Xen-API] xcp and minimum memory

I forgot mention - reboot after changes.

If you want more memory to dom0, you can change it via xe vm-memory-target-set for Control Domain for your host (you can get dom uuid from xe vm-list with 'control domain' in name-label).


28.09.2012 10:35, Lyn Amery ÐÐÑÐÑ:

Thanks for your assistance. ÂTried it, but still makes no difference.

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From: "George Shuklin" <george.shuklin@xxxxxxxxx>
To: xen-api@xxxxxxxxxxxxx
Sent: Friday, 28 September, 2012 2:00:21 PM
Subject: Re: [Xen-API] xcp and minimum memory

1) don't use xend (or it configs). xapi or xend, not both.
2) Proper setting is

/etc/default/grub
# Start dom0 with less RAM
GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=1024M"

and do update-grub after changing default.

28.09.2012 09:40, Lyn Amery ÐÐÑÐÑ:

Hi,

I've installed xcp (xcp-xapi) on Ubuntu 12.04 - installed, but have gotten no further. ÂWhat's stopped me dead in my tracks is that Xen appears to grab most of my 6GB of memory - well, *something does* - leaving only 1GB for me to run my desktop on. ÂVery slow and painful to use. Â(It would be ideal to run this on a test server, but nothing is available.)

First, do I understand correctly that "dom0" is just the host system? ÂIn other words, when I boot the Xen kernel, that's dom0, yes?

Here's what I've tried up to this point.

Edited /etc/default/grub

 GRUB_CMDLINE_XEN="dom0_mem=2G,max:2G"Â

also tried

 GRUB_CMDLINE_XEN="dom0_mem=512M,max:512M"

... followed by update-grub command.

Edited /etc/xen/xend-config.sxp

--------------------------------------

 xend-config.sxp:(dom0-min-mem 2048)

 (enable-dom0-ballooning no)

All mods followed by reboots, of course. ÂNone seems to make any difference. ÂThe performance monitor application and "free" command show just under 1GB available when booted under the Xen kernel, 6BG when booted under normal Ubuntu.

Xen reports the proper memory stats:

# xe host-list params=all | grep memory

 memory-overhead ( RO): 83017728

 memory-total ( RO): 6372888576

 memory-free ( RO): 5120520192

 memory-free-computed ( RO): <expensive field>

Have I missed some basic concept somewhere? ÂAnyone have similar problems?

Cheers,

LynÂ

Â
--
---------------------
Lyn Amery
Gaia Resources
p +61 8 9227 7309
w www.gaiaresources.com.au
e lyn@xxxxxxxxxxxxxxxxxxxx

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--
---------------------
Lyn Amery
Gaia Resources
p +61 8 9227 7309
w www.gaiaresources.com.au
e lyn@xxxxxxxxxxxxxxxxxxxx

--
---------------------
Lyn Amery
Gaia Resources
p +61 8 9227 7309
w www.gaiaresources.com.au
e lyn@xxxxxxxxxxxxxxxxxxxx

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