[ldoms-discuss] Powerpath support in control domain ?

Tue Jan 8 10:42:18 PST 2008

  Several problems with exporting disks have been solved with the
fix for 6528156 (opening devices exclusively from vds causes several
problems).

  There is a still a problem with disks exported through vxdmp, bug 6637560
(disks are not correctly exported with vxdmp). This is problem may impact
some other driver (maybe EMC powerpath?), this occurs if a physical disk
is exported through a pseudo device.

  So if the EMC device used for powerpath is a pseudo device when you will
certaintly hit 6637560.

alex.

Octave Orgeron wrote:
> Hi,
> 
> There are other issues with VxVM when it comes to LDoms. VxVM relies on the low level USCSI functions, which is why you can't use it in a guest domain at this time. However, in build 80 this should be fixed already. Look here:
> 
> http://www.opensolaris.org/os/community/arc/caselog/2007/672/
> 
> That should enable guest domains to use VxVM. Also, in build 75 the vdisk driver was updated so that you can virtualize SVM/ZFS/VxVM volumes and use them as full disks in guest domains. I have a few guest domains running on ZFS volumes as their boot devices.
> 
> When it comes to multi-pathing, the vendors (EMC, HDS, etc) will have to update their software so the devices can be virtualized properly. At this point, if you try to virtualize a power-path device, you end up with nothing in the guest domain:(
>  
> *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
> Octave J. Orgeron
> Solaris Systems Engineer
> http://www.opensolaris.org/os/community/sysadmin/
> http://unixconsole.blogspot.com
> unixconsole at yahoo.com
> *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
> 
> ----- Original Message ----
> From: Victor Engle <victor.engle at gmail.com>
> To: Brian Glynn <Brian.Glynn at sun.com>
> Cc: Octave Orgeron <unixconsole at yahoo.com>; ldoms-discuss at opensolaris.org
> Sent: Tuesday, January 8, 2008 11:56:22 AM
> Subject: Re: [ldoms-discuss] Powerpath support in control domain ?
> 
> 
> I had assumed that the problem with VxVM and LDOMs was in how VxVM DMP
> works. When using VxVM, the device virtualization occurs after all the
> devices are discovered and device files created. VxVM DMP then
> virtualizes the devices into a /dev/vx/dmp... device so then if you
> use the /dev/vx device to create volumes and filesystems they are
> protected from path failures.
> 
> My assumption was that the /dev/vx devices were not suitable for
> virtualizing and exporting to a logical domain.
> 
> I know that some multipathing solutions work in a similar fashion
> compared with STMS like SecurePath for example. With SecurePath the
> devices in /dev/dsk link to swsp devices in the /devices tree. With
> SecurePath the /dev/dsk/cxtxdxsx devices may be used directly just as
> with STMS.
> 
>>From Octave's reply it sounds as though it is incorrect to assume that
> /dev/dsk/ctd devices will work when they are controlled by none-STMS
> multipathing solutions.
> 
> On Jan 8, 2008 12:34 PM, Brian Glynn <Brian.Glynn at sun.com> wrote:
>>  Thanks for the prompt response Octave,
>>
>>  I don't really care if its supported or not as the target
>  environment is
>> PoC / dev, rather will it work....
>>
>>  Adios
>>
>>  Brian
>>
>>  Octave Orgeron wrote:
>>
>> As far as I know at this point, you can only use STMS/MPXIO.
>  Powerpath,
>> HDLM, VxDMP, etc are not supported.
>>
>>
>>   *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
>>  Octave J. Orgeron
>>  Solaris Systems Engineer
>>  http://www.opensolaris.org/os/community/sysadmin/
>>  http://unixconsole.blogspot.com
>>  unixconsole at yahoo.com
>>  *-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
>>
>>
>>
>> ----- Original Message ----
>>  From: Brian Glynn <Brian.Glynn at Sun.COM>
>>  To: ldoms-discuss at opensolaris.org
>>  Sent: Tuesday, January 8, 2008 10:25:42 AM
>>  Subject: [ldoms-discuss] Powerpath support in control domain ?
>>
>>  Hi All,
>>
>>  Have been trawling but yet to get a clear answer...
>>
>>  Can Powerpath devices, visible in the control domain, be used to
>  support
>> vsd devices for guest ldoms ? If so what versions of FW / Powerpath
>  have
>> been seen working and details of any gotcha's would also be
>  appreciated
>> (other than the need for a valid vtoc on the target device).
>>
>>  Proven syntax would be even better :-)
>>
>>  Adios
>>
>>  Brian
>>
>>
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> 
> 
> 
> 
> 
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