Mailing List Archive: DRBD: Users

Active/Active iSCSI setup

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phmazzoni at gmail

Jan 9, 2012, 7:43 AM

Post #1 of 5 (961 views)
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Active/Active iSCSI setup

Hello everyone,

We are planning to implement the Active/Active iSCSI setup:
http://www.linbit.com/fileadmin/tech-guides/ha-iscsi.pdf

The plan is to have 2 VG, 2 iSCSI target, with 2 Virtual IPs, with 2
Servers.
In order to load balance, we are planning to make one primary Server per
iSCSI target, that is:

Server01:
iSCSI target 01: Primary
iSCSI target 02: Secondary

Server01
iSCSI target 01: Secondary
iSCSI target 02: Primary

It seems that on the refered guide, both targets are active on the same
server.

Is it right?
This configuration sounds reasonable?

Thanks in advance,
Pedro Mazzoni

misch at schwartzkopff

Jan 9, 2012, 7:50 AM

Post #2 of 5 (945 views)
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Re: Active/Active iSCSI setup [In reply to]

> Hello everyone,
>
> We are planning to implement the Active/Active iSCSI setup:
> http://www.linbit.com/fileadmin/tech-guides/ha-iscsi.pdf
>
> The plan is to have 2 VG, 2 iSCSI target, with 2 Virtual IPs, with 2
> Servers.
> In order to load balance, we are planning to make one primary Server per
> iSCSI target, that is:
>
> Server01:
> iSCSI target 01: Primary
> iSCSI target 02: Secondary
>
> Server01
> iSCSI target 01: Secondary
> iSCSI target 02: Primary
>
> It seems that on the refered guide, both targets are active on the same
> server.
>
> Is it right?
> This configuration sounds reasonable?
>
> Thanks in advance,
> Pedro Mazzoni

Read:

http://fghaas.wordpress.com/2011/11/29/dual-primary-drbd-iscsi-and-multipath-
dont-do-that/

--
Dr. Michael Schwartzkopff
Guardinistr. 63
81375 München

Tel: (0163) 172 50 98
Fax: (089) 620 304 13

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florian at hastexo

Jan 9, 2012, 8:04 AM

Post #3 of 5 (951 views)
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Re: Active/Active iSCSI setup [In reply to]

On Mon, Jan 9, 2012 at 4:50 PM, Michael Schwartzkopff
<misch [at] schwartzkopff> wrote:
> http://fghaas.wordpress.com/2011/11/29/dual-primary-drbd-iscsi-and-multipath-
> dont-do-that/

... which clearly does not apply to the Tech Guide he's been reading.

Pedro, your approach is sound. Please follow the guide you already
have. The configuration with each node hosting one iSCSI target portal
group, and no DRBD dual-Primary being involved, is fine.

Cheers,
Florian

--
Need help with High Availability?
http://www.hastexo.com/now
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phmazzoni at gmail

Jan 9, 2012, 8:19 AM

Post #4 of 5 (944 views)
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Re: Active/Active iSCSI setup [In reply to]

Thanks Florian!

But I didn't saw on the configuration guide where I set that each VG will
be hosted primarily on different servers.

Thanks in advance,
Pedro Mazzoni

2012/1/9 Florian Haas <florian [at] hastexo>

> On Mon, Jan 9, 2012 at 4:50 PM, Michael Schwartzkopff
> <misch [at] schwartzkopff> wrote:
> >
> http://fghaas.wordpress.com/2011/11/29/dual-primary-drbd-iscsi-and-multipath-
> > dont-do-that/
>
> ... which clearly does not apply to the Tech Guide he's been reading.
>
> Pedro, your approach is sound. Please follow the guide you already
> have. The configuration with each node hosting one iSCSI target portal
> group, and no DRBD dual-Primary being involved, is fine.
>
> Cheers,
> Florian
>
> --
> Need help with High Availability?
> http://www.hastexo.com/now
> _______________________________________________
> drbd-user mailing list
> drbd-user [at] lists
> http://lists.linbit.com/mailman/listinfo/drbd-user
>

florian at hastexo

Jan 9, 2012, 8:30 AM

Post #5 of 5 (941 views)
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Re: Active/Active iSCSI setup [In reply to]

On Mon, Jan 9, 2012 at 5:19 PM, Pedro Henrique Morsch Mazzoni
<phmazzoni [at] gmail> wrote:
> Thanks Florian!
>
> But I didn't saw on the configuration guide where I set that each VG will be
> hosted primarily on different servers.

Use location constraints, as explained here:

http://www.clusterlabs.org/doc/en-US/Pacemaker/1.1/html/Clusters_from_Scratch/ch06s07.html

Cheers,
Florian

--
Need help with High Availability?
http://www.hastexo.com/now
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