[OmniOS-discuss] Illumos/omnios ALUA support was:: Active-Active vSphere

[Johan Kragsterman]

So, since this subject seams very much to be around ALUA understanding, this might be a good opportunity to discuss Illumos/OmniOS ALUA implementation..?

So I change/alter the subject, if you folks don't mind...?

If you mind, I can start a new thread...?

I continue further down...



-----"OmniOS-discuss" <omnios-discuss-bounces at lists.omniti.com> skrev: -----
Till: Rune Tipsmark <rt at steait.net>
Från: Saso Kiselkov 
Sänt av: "OmniOS-discuss" 
Datum: 2014-11-28 15:54
Kopia: "omnios-discuss at lists.omniti.com" <omnios-discuss at lists.omniti.com>
Ärende: Re: [OmniOS-discuss] Active-Active vSphere

On 11/28/14 3:34 PM, Rune Tipsmark wrote:
> Okay, i noticed alua support is not enabled per default on omnios. How do i enable that?

The process is complicated, not very well documented and it isn't meant
for your scenario anyway. If you only have one storage node, then you
don't need ALUA, even if you have multiple connections to the node. So
no need to worry about it.




When you say it is poorly documented, I suppose you mean ALUA on Illumos dists?

If you mean on Illumos dists, I haven't found any documentation, apart from your(Saso) patch Feature #3775. If you know of any such documentation, pls give us a link to it.

There are some documentation though, from Nexenta and high-availability.com, but I find this difficult to use in OmniOS, since it's only Nexenta focus(of coarse).


One thing I don't understand is if the Nexenta implementation of ALUA use access through the "not prefered path" to the LUN(-s), even through the node that doesn't own it?? In my understanding, that would need a complicated interconnect between the head nodes, as well as a LU pass-through handling through the "not prefered path-node", wouldn't it? And I haven't seen that anywhere in Illumos/Nexenta, but of coarse, I might be wrong here...?

If I'm right here, the Nexenta implementation of ALUA is not providing the connection to the LUN(-s) through the "not prefered path", it only provides access after failover, when the "not prefered path" has become the "prefered path"?

If I'm wrong here, and have failed to understand something, pls enlighten me...



I'm also curious about the NMC, Nexenta Management Console. Is that one also in illumos-gate, or any equivalent software...?

If not, we would need to add and check the target group members on both(all) nodes manually, right?


How is this related to your implementation of stmf-ha, Saso?


Regards Johan







Cheers,
-- 
Saso

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