XCP 64 bits ?

XCP 64 bits ?

[medhioub]

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Hello,

I am just installing XCP 0.1.1 on a server with 24GB RAM

Normally XCP is a 64 bits version but

    * *uname -a*
           Linux node012 2.6.27.42-0.1.1.xs0.1.1.737.1065xen #1 SMP Fri
      Jan 15 16:20:16 EST 2010 i686 i686 i386 GNU/Linux
      (not a x86_64 version !!!!)
    * *cat /proc/meminfo*
      MemTotal:         746496 kB
      MemFree:          384332 kB
      Buffers:             43640 kB
      Cached:            99540 kB
      SwapCached:          0 kB
      Active:              93160 kB
      Inactive:           85528 kB
      HighTotal:        0 kB
      HighFree:         0 kB
      LowTotal:         746496 kB
      LowFree:          384332 kB
      SwapTotal:       524280 kB
      SwapFree:        524280 kB
      Dirty:                40 kB
      Writeback:        0 kB
      AnonPages:       35536 kB
      Mapped:           14780 kB
      Slab:                 20836 kB
      SReclaimable:   9308 kB
      SUnreclaim:      11528 kB
      PageTables:       0 kB
      NFS_Unstable:   0 kB
      Bounce:              0 kB
      WritebackTmp:   0 kB
      CommitLimit:     897528 kB
      Committed_AS:  263952 kB
      VmallocTotal:     225272 kB
      VmallocUsed:     6564 kB
      VmallocChunk:   218448 kB
      DirectMap4k:     755432 kB
      DirectMap2M:    0 kB

         (where is the 24 GB!!!!!)

Thanks in advance.

Best Regards,
Houssem Medhioub

-- 
Houssem MEDHIOUB
Research Engineer
Wireless Networks and Multimedia Services Department(RS2M)
TELECOM&  Management SudParis
9 rue Charles Fourier
91011 EVRY Cedex, France
Phone : +33(0)6 61 24 68 06
Fax   : +33(0)1 60 76 45 78
E-mail: houssem.medhioub@it-sudparis.eu


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Re: XCP 64 bits ?

[Vincent Hanquez]

On 04/03/10 13:05, medhioub wrote:
> Hello,
>
> I am just installing XCP 0.1.1 on a server with 24GB RAM
>
> Normally XCP is a 64 bits version but
>
> (where is the 24 GB!!!!!)

Hi,

You are only looking at dom0 here.
dom0 is a 32 bit centos that is taking ~750mb of your 24GB ram.
what's left of the 24GB is available for your VMs.

you can run "/opt/xensource/debug/xenops physinfo" if you want to see 
how much ram has been detected.

-- 
Vincent

Re: XCP 64 bits ?

[Pasi Kärkkäinen]

On Thu, Mar 04, 2010 at 02:05:24PM +0100, medhioub wrote:
>    Hello,
> 
>    I am just installing XCP 0.1.1 on a server with 24GB RAM
> 
>    Normally XCP is a 64 bits version but
> 
>      * uname -a
>            Linux node012 2.6.27.42-0.1.1.xs0.1.1.737.1065xen #1 SMP Fri Jan
>        15 16:20:16 EST 2010 i686 i686 i386 GNU/Linux
>        (not a x86_64 version !!!!)

You're looking at Xen dom0 kernel version. 
XCP uses 32bit dom0 kernel on 64bit Xen hypervisor.

>      *  cat /proc/meminfo
>        MemTotal:         746496 kB
>        MemFree:          384332 kB
>        Buffers:             43640 kB
>        Cached:            99540 kB
>        SwapCached:          0 kB
>        Active:              93160 kB
>        Inactive:           85528 kB
>        HighTotal:        0 kB
>        HighFree:         0 kB
>        LowTotal:         746496 kB
>        LowFree:          384332 kB
>        SwapTotal:       524280 kB
>        SwapFree:        524280 kB
>        Dirty:                40 kB
>        Writeback:        0 kB
>        AnonPages:       35536 kB
>        Mapped:           14780 kB
>        Slab:                 20836 kB
>        SReclaimable:   9308 kB
>        SUnreclaim:      11528 kB
>        PageTables:       0 kB
>        NFS_Unstable:   0 kB
>        Bounce:              0 kB
>        WritebackTmp:   0 kB
>        CommitLimit:     897528 kB
>        Committed_AS:  263952 kB
>        VmallocTotal:     225272 kB
>        VmallocUsed:     6564 kB
>        VmallocChunk:   218448 kB
>        DirectMap4k:     755432 kB
>        DirectMap2M:    0 kB
> 
>            (where is the 24 GB!!!!!)
> 

This is the memory your dom0 _guest_ has allocated to it.
The rest of the memory is available (free) in the Xen hypervisor.

-- Pasi

>    Thanks in advance.
> 
>    Best Regards,
>    Houssem Medhioub
> 
>  --
>  Houssem MEDHIOUB
>  Research Engineer
>  Wireless Networks and Multimedia Services Department(RS2M)
>  TELECOM & Management SudParis
>  9 rue Charles Fourier
>  91011 EVRY Cedex, France
>  Phone : +33(0)6 61 24 68 06
>  Fax   : +33(0)1 60 76 45 78
>  E-mail: [1]houssem.medhioub@it-sudparis.eu
> 
> References
> 
>    Visible links
>    1. mailto:houssem.medhioub@it-sudparis.eu

> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel

Re: XCP 64 bits ?

[medhioub]

Hello,

First, thank you for your fast answear.

There is no 64 bits version of XCP dom0?

Thanks

On 03/04/2010 02:16 PM, Vincent Hanquez wrote:
> On 04/03/10 13:05, medhioub wrote:
>> Hello,
>>
>> I am just installing XCP 0.1.1 on a server with 24GB RAM
>>
>> Normally XCP is a 64 bits version but
>>
>> (where is the 24 GB!!!!!)
>
> Hi,
>
> You are only looking at dom0 here.
> dom0 is a 32 bit centos that is taking ~750mb of your 24GB ram.
> what's left of the 24GB is available for your VMs.
>
> you can run "/opt/xensource/debug/xenops physinfo" if you want to see 
> how much ram has been detected.
>

-- 
Houssem MEDHIOUB
Research Engineer
Wireless Networks and Multimedia Services Department(RS2M)
TELECOM&  Management SudParis
9 rue Charles Fourier
91011 EVRY Cedex, France
Phone : +33(0)6 61 24 68 06
Fax   : +33(0)1 60 76 45 78
E-mail: houssem.medhioub@it-sudparis.eu

RE: XCP 64 bits ?

[Ian Pratt]

> First, thank you for your fast answear.
> 
> There is no 64 bits version of XCP dom0?

There's no particular benefit of having a 64b dom0  -- it's supposed to be a small VM used mostly for control plane functionality, and doesn't need to map much memory. 32b dom0 has been shown to be a bit faster and less memory hungry than 64b.  I guess XCP might switch to 64b at some point, but there aren't any strong reasons for it at the moment.

Ian


> 
> Thanks
> 
> On 03/04/2010 02:16 PM, Vincent Hanquez wrote:
> > On 04/03/10 13:05, medhioub wrote:
> >> Hello,
> >>
> >> I am just installing XCP 0.1.1 on a server with 24GB RAM
> >>
> >> Normally XCP is a 64 bits version but
> >>
> >> (where is the 24 GB!!!!!)
> >
> > Hi,
> >
> > You are only looking at dom0 here.
> > dom0 is a 32 bit centos that is taking ~750mb of your 24GB ram.
> > what's left of the 24GB is available for your VMs.
> >
> > you can run "/opt/xensource/debug/xenops physinfo" if you want to see
> > how much ram has been detected.
> >
> 
> --
> Houssem MEDHIOUB
> Research Engineer
> Wireless Networks and Multimedia Services Department(RS2M)
> TELECOM&  Management SudParis
> 9 rue Charles Fourier
> 91011 EVRY Cedex, France
> Phone : +33(0)6 61 24 68 06
> Fax   : +33(0)1 60 76 45 78
> E-mail: houssem.medhioub@it-sudparis.eu
> 
> 
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel

Re: XCP 64 bits ?

[medhioub]

Thank you Vincent, Pasi and Ian for your answears and hoping that can 
you help me a little more with your advice :-)

Let me explain more precisely my problem.
We just installed a new cluster (32 servers with Nehalem CPU and 24 GB).
To automate the deployment of XCP on multiple machines, we want to 
create an image of the installed software of XCP.
P.S. we use Bright Computing as a cluster manager  
http://www.brightcomputing.com/

Now we installed XCP in a physical machine and want to grab all the 
softwares (the hypervisor and the dom0) on an image that can be deployed 
automatically on the whole cluster using Bright Computing Cluster Manager.

Any idea or advice ?

Thank you

Best Regards,
Houssem Medhioub


On 03/04/2010 02:16 PM, Vincent Hanquez wrote:
> On 04/03/10 13:05, medhioub wrote:
>> Hello,
>>
>> I am just installing XCP 0.1.1 on a server with 24GB RAM
>>
>> Normally XCP is a 64 bits version but
>>
>> (where is the 24 GB!!!!!)
>
> Hi,
>
> You are only looking at dom0 here.
> dom0 is a 32 bit centos that is taking ~750mb of your 24GB ram.
> what's left of the 24GB is available for your VMs.
>
> you can run "/opt/xensource/debug/xenops physinfo" if you want to see 
> how much ram has been detected.
>

-- 
Houssem MEDHIOUB
Research Engineer
Wireless Networks and Multimedia Services Department(RS2M)
TELECOM&  Management SudParis
9 rue Charles Fourier
91011 EVRY Cedex, France
Phone : +33(0)6 61 24 68 06
Fax   : +33(0)1 60 76 45 78
E-mail: houssem.medhioub@it-sudparis.eu

Re: XCP 64 bits ?

[Vincent Hanquez]

On 04/03/10 13:41, medhioub wrote:
> Thank you Vincent, Pasi and Ian for your answears and hoping that can
> you help me a little more with your advice :-)
>
> Let me explain more precisely my problem.
> We just installed a new cluster (32 servers with Nehalem CPU and 24 GB).
> To automate the deployment of XCP on multiple machines, we want to
> create an image of the installed software of XCP.
> P.S. we use Bright Computing as a cluster manager
> http://www.brightcomputing.com/
>
> Now we installed XCP in a physical machine and want to grab all the
> softwares (the hypervisor and the dom0) on an image that can be deployed
> automatically on the whole cluster using Bright Computing Cluster Manager.
>
> Any idea or advice ?

cloning XCP installation is not different than cloning a normal linux 
installation. everything is available as a hard disk through 
/dev/(s|h)da or directly as a linux path /, but the you need to 
customize everything after you cloned it to the other machine.

Just thinking on XCP specific things, you probably need to delete the 
cloned database, and have the first scripts rerun on the cloned machine 
(have a look at /etc/firstboot.d). But this is not trivial, and you have 
to ready to commit some time and effort to do that.

-- 
Vincent