[Users] Limit swap space on ovirt node install

[Mike Burns]

On Fri, 2012-10-19 at 14:26 +0200, Jorick Astrego wrote:
> Hi,
> 
> Finally I found the problem but I still don't understand it.
> 
> The problem appears to be that I install using the Supermicro IPMI with 
> local cdrom.
> 
> Installation goes well but after that I am unable to login remotely and 
> get the error "systemd-readahead-collect[500]: Failed to open pack file: 
> Read-only file system". The system appears to hang.
> 
> When I hook up a screen and keyboard I can login normally and everything 
> works fine, this is very strange and annoying as I now need to install 
> every node in the datacenter.
> I also tried logging in after startup but when I check the IPMI, I only 
> get a black screen.
> 
> Now I started using cobbler for using PXE boot with latest nightly 
> release, but I still have to install and configure the node. How can I 
> push the installation automatically so I can install unattended?

We apparently don't have the options documented on ovirt.org anywhere,
but I'll make sure we do that.  In the meantime, you can refer to this
document [1] for automated installation options.  The options are pretty
much identical.  

Thanks

Mike

[1] http://goo.gl/vbeXQ

> 
> Any ideas?
> 
> Kind regards,
> 
> Jorick Astrego
> 
> On 10/15/2012 03:57 PM, Jorick Astrego wrote:
> > Hi Mark,
> >
> > It took a while to have the time to continue testing.
> >
> > I tried both methods. When I use " storage_vol=:4000:::: " and " 
> > mem_overcommit=0" everything installs fine.
> >
> > But after I reboot the node i get the screen "login as admin to 
> > configure" and the system hangs.
> >
> > After several seconds I get the message 
> > "systemd-readahead-collect[500]: Failed to open pack file: Read-only 
> > file system"
> >
> > When I only use " mem_overcommit=0 ", I cannot install the node as the 
> > Disk Space Check tells me I need a bigger drive.
> >
> > "Available Space: 14305MB"
> > "Required Space: 26782MB"
> >
> > This should be less:
> >
> > 0*32 +  8(32<64) = 8GB Swap.
> >
> > Plus the storage ovirt needs itself (300MB?)
> >
> > I tried ovirt-node 2.5.1 and 2.5.2
> >
> > Kind regards,
> >
> > Jorick Astrego
> > Netbulae B.V.
> >
> > On 09/01/2012 10:34 PM, Mike Burns wrote:
> >> You can do this with 2 different methods, both of which are on the 
> >> kernel command line during boot. Simply hit TAB when you're selecting 
> >> the install option and add one of the options below to the command line.
> >>
> >> 1.  You can set " storage_vol=:XXX:::: "  where XXX is the desired 
> >> size of the SWAP partition in MB.  It has a minimum size of 5MB.
> >>    This lets you set a static size for swap.
> >>
> >> 2.  You can set mem_overcommit=0.  This will change our calculation 
> >> to not add any swap for overcommit.  It will still calculate a value 
> >> based on the amount of RAM, but not as large as with the overcommit.
> >>
> >> The swap size is calculated at mem_overcommit*RAM + <BASE_SWAP>
> >>
> >> BASE_SWAP is calculated using this formula:
> >>
> >> if MEM_SIZE < 4GB:
> >>      BASE_SWAP = 2GB
> >> elif MEM_SIZE < 16GB:
> >>      BASE_SWAP = 4GB
> >> elif MEM_SIZE < 64GB:
> >>      BASE_SWAP = 8GB
> >> else:
> >>      BASE_SWAP = 16GB
> >>
> >>
> >> We are planning to expose these option in the TUI installer, just not 
> >> there yet.
> >>
> >> Mike
> >>
> >>
> >> ----- Original Message -----
> >>> Hi,
> >>>
> >>> We have a 16GB SSD in all our nodes to install the ovirt node image
> >>> on.
> >>> While installing I get the message there is not enough space.
> >>>
> >>> After checking the requirements of ovirt node it should fit quite
> >>> easily, but I think the swap space assigned is too much as we have a
> >>> lot
> >>> of ram in the nodes.
> >>>
> >>> As we don't overcommit the RAM in our nodes we shouldn't need that
> >>> much
> >>> swap. Is there any way to modify it? I'd hate to have to buy new
> >>> SSD's :-(
> >>>
> >>> -- 
> >>> Regards,
> >>>
> >>> Netbulae
> >>> Jorick Astrego
> >>>
> >>> Netbulae B.V.
> >>>
> >>>
> >>> _______________________________________________
> >>> Users mailing list
> >>> Users at ovirt.org
> >>> http://lists.ovirt.org/mailman/listinfo/users
> >>>
> >
> >
> 
> 
> 
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