WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-users

Re: [Xen-devel] Re: [Xen-API] FT for XCP

On Sun, Oct 09, 2011 at 01:16:46AM +0530, R J wrote:
>    Thanks Shriram,
> 
>    I thought of using the native VM migrate code but in that case I may end
>    up with corruption either in NW, DIsk or Mem.
>    The remus page is not updated. [1]http://nss.cs.ubc.ca/remus/hg/ I hope
>    this project is not stopped.
> 

There's also: http://wiki.xen.org/xenwiki/Remus

-- Pasi

>    I'm still learning xen-3.4.2/tools path so hopefully I'll get some
>    direction which can save from corruption.
> 
>    Regards,
>    R J
> 
>    On Wed, Sep 28, 2011 at 9:38 PM, Shriram Rajagopalan
>    <[2]rshriram@xxxxxxxxx> wrote:
> 
>      On Mon, Sep 26, 2011 at 8:58 AM, R J <[3]torushikeshj@xxxxxxxxx> wrote:
> 
>        Hello Mike,
> 
>        Thank you for suggestion. I would love to incorporate remus in xapi if
>        thats possible.
> 
>      Great. That would be certainly welcome. [I am not a fan of ocaml ;)]
> 
>        Remus as its inbuilt logic of detecting checkpoint failure and taking
>        decisions accordingly.
> 
>        I think there is remus support for xen 3.4
> 
>      What matters is the toolstack.
>      a. I am not sure if the xe toolstack uses libxenguest (tools/libxc) and
>       if it does, then it should have the basic remus support already.
> 
>      b. I am also not sure if it is recent enough to include all the remus
>      bug
>      fixes that went in over the last 6 months.
> 
>        What do you suggest as my next step ?
> 
>      Most of the remus code is python based and completely self contained. It
>      just needs
>      the domU's info (disk paths & vifs) as an s-expression. There is only
>      one api call to
>      Xend- to obtain the domU's s-expression.
> 
>      1. A quick and dirty way would be to change this single api call to xapi
>      equivalent
>      and obtain the s-expression, then you should have Remus running.
> 
>      2. Another approach would be to re-write the toolstack code in ocaml -
>      which might
>      be easy. But make sure that ocaml can make netlink api calls.
> 
>      shriram
> 
>        Regards,
>        Rushikesh
> 
>        On Mon, Sep 26, 2011 at 12:38 PM, Mike McClurg
>        <[4]mike.mcclurg@xxxxxxxxxx> wrote:
> 
>          On 09/25/2011 09:11 PM, R J wrote:
> 
>            Hello List,
> 
>            I have a proposal and wont mind to implement my self but need a
>            helping hand to start on.
>            I want to implement the aggressive FT feature in XCP. The best way
>            I could imagine is the use of feature *Live Migration*
> 
>            Steps
>            1. Enable the FT of a particular VM using xe commands and adding
>            as a param to that VM e.g. xe vm-param-set FT=true uuid=XYZ
>            2. If the FT = true detected by xenstore then xapi will initiate a
>            live migrate of that VM to any of available host.
>            3. A parallel "network ping"/"xapi heartbit" from/to that host
>            could be initialized for each FT VM.
>            4. Live migrate will run forever until its disabled by FT = false
>            or one of the host is down. e.g. the process will loop at 99.99%
>            migration state
>            5. If there is a packet drop of x packets the VM Migrate procedure
>            will mark the VM Migration as Complete and will switch the devices
>            forcefully.
>            -- this could result in some data loss but I dont have any
>            alternative to this.
>            -- The specific x packets can be set by XCP but we cant rely for
>            default XCP Errors
>            6. If there is a successful migration due to host down then we
>            will again start from step2
> 
>            Above steps I have assumed to my knowledge, we can discuss the
>            problems in it.
> 
>            Apologies if I'm being too naive.
> 
>            Regards,
>            Rushikesh
> 
>          This sounds like Remus ([5]http://nss.cs.ubc.ca/remus/). Are you
>          proposing to implement Remus support in xapi?
>          Mike
> 
>        _______________________________________________
>        Xen-devel mailing list
>        [6]Xen-devel@xxxxxxxxxxxxxxxxxxx
>        [7]http://lists.xensource.com/xen-devel
> 
> References
> 
>    Visible links
>    1. http://nss.cs.ubc.ca/remus/hg/
>    2. mailto:rshriram@xxxxxxxxx
>    3. mailto:torushikeshj@xxxxxxxxx
>    4. mailto:mike.mcclurg@xxxxxxxxxx
>    5. http://nss.cs.ubc.ca/remus/
>    6. mailto:Xen-devel@xxxxxxxxxxxxxxxxxxx
>    7. http://lists.xensource.com/xen-devel

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


_______________________________________________
xen-api mailing list
xen-api@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/mailman/listinfo/xen-api

<Prev in Thread] Current Thread [Next in Thread>