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

[Shankhadeep S. <sha...@gm...>]

I wouldn't call it legacy, implicit/explicit ALUA is fine grain path
control and combined with session recovery will allow you to create a
clustered storage system.
On Jul 16, 2012 3:35 AM, "Pasi Kärkkäinen" <pa...@ik...> wrote:

> 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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