Re: [Iscsitarget-devel] Multipath to two IET nodes?

[Pasi K. <pa...@ik...>]

On Mon, Jul 16, 2012 at 01:23:49AM -0400, Shankhadeep Shome wrote:
>    Not really Michael, if you're interested in dual primary mode you can look
>    into LIO which supports ALUA.
>

Isn't ALUA (Asymmetric LUn Access) the "legacy" method of having a primary and secondary path for a LUN? 
How does it help with dual-primary active-active? I thought it was only used for active-passive.

-- Pasi

> You can use this feature with the linux port
>    of ZFS (use zfs import ) and pull something together than may work.
>    [1]http://linux-iscsi.org/wiki/Main_Page
>    [2]https://groups.google.com/forum/?fromgroups#!topic/linux-iscsi-target-dev/QrZiOnLEzeo
>    On Wed, Jun 20, 2012 at 2:05 PM, Kushnir, Michael (NIH/NLM/LHC) [C]
>    <[3]mic...@ni...> wrote:
> 
>      No. This has been beat to death already. See:
>      [4]http://fghaas.wordpress.com/2011/11/29/dual-primary-drbd-iscsi-and-multipath-dont-do-that/
> 
>      Michael
> 
>      ________________________________________
>      From: Luca Lesinigo [[5]lu...@lm...]
>      Sent: Wednesday, June 20, 2012 1:21 PM
>      To: [6]isc...@li...
>      Subject: [Iscsitarget-devel] Multipath to two IET nodes?
>      I can put together two linux servers and use DRBD in dual-primary mode
>      to get a shared block device with concurrent read/write access on the
>      two nodes.
> 
>      Can I then export an iSCSI target from each node and use the two like a
>      single multipath iSCSI device?
>      eg. to simulate a dual-controller iSCSI storage array
> 
>      I would guess it is possible if the iSCSI multipath implementation
>      assumes completely independent targets for the multiple paths, and it
>      would fail if the two need to know about each other. But I don't know
>      iSCSI enough to answer that question :)
> 
>      thanks,
>      --
>      Luca Lesinigo
> 
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> References
> 
>    Visible links
>    1. http://linux-iscsi.org/wiki/Main_Page
>    2. https://groups.google.com/forum/?fromgroups#!topic/linux-iscsi-target-dev/QrZiOnLEzeo
>    3. mailto:mic...@ni...
>    4. http://fghaas.wordpress.com/2011/11/29/dual-primary-drbd-iscsi-and-multipath-dont-do-that/
>    5. mailto:lu...@lm...
>    6. mailto:isc...@li...
>    7. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>    8. mailto:Isc...@li...
>    9. https://lists.sourceforge.net/lists/listinfo/iscsitarget-devel
>   10. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/
>   11. mailto:Isc...@li...
>   12. https://lists.sourceforge.net/lists/listinfo/iscsitarget-devel

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