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Nov 23, 2009 1:35 PM
by: deonc
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From:
GB
Registered:
11/5/09
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Possible to have a HA iSCSI cluster (using ZFS) ?
Posted:
Nov 5, 2009 6:57 AM
To: Communities » ha-clusters » discuss
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Hey,
I've been digging around for ages now trying to find the answer, but keep hitting old resources saying iSCSI targets not tested yet etc.
Basically is it possible yet to build a HA iSCSI cluster? There seems to be so many different projects that cover part of the process (e.g. COMSTAR) but I can't seem to find a way of combining it all to provide a fully redundant, seamless failover storage system.
The fact that products like Nexentastor exist seems to hint that its not possible with current open projects?
Thanks in advance,
Andy.
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43
From:
California
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Re: [ha-clusters-discuss] Possible to have a HA iSCSI cluster
(using ZFS) ?
Posted:
Nov 5, 2009 12:45 PM
in response to: andy.c
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Hi Andy,
iSCSI can be used with Sun Cluster in a variety of ways.
What do you mean by an HA iSCSI cluster ?
Regards,
Ellard
Andy Coates wrote:
> Hey,
>
> I've been digging around for ages now trying to find the answer, but keep hitting old resources saying iSCSI targets not tested yet etc.
>
> Basically is it possible yet to build a HA iSCSI cluster? There seems to be so many different projects that cover part of the process (e.g. COMSTAR) but I can't seem to find a way of combining it all to provide a fully redundant, seamless failover storage system.
>
> The fact that products like Nexentastor exist seems to hint that its not possible with current open projects?
>
> Thanks in advance,
> Andy.
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Posts:
4
From:
GB
Registered:
11/5/09
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Re: [ha-clusters-discuss] Possible to have a HA iSCSI cluster (using ZFS) ?
Posted:
Nov 5, 2009 3:23 PM
in response to: roush
To: Communities » ha-clusters » discuss
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Hi Ellard,
A 'HA iSCSI cluster' to me is essentially a group of servers (n+1) that provide iSCSI target services in a redundant environment, so basically a highly available iSCSI SAN. It would ideally offer features like the ability to do snapshots, automatic failover, multipath etc.
That make sense?
Thanks,
Andy.
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68
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1/10/08
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[ha-clusters-discuss] Recommendation Request: Building Solaris 10
HA Containers with Open HA
Posted:
Nov 19, 2009 3:41 PM
in response to: roush
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Hi List,
I am seeking advice as to the feasibility of a project I'm working on:
Background: My sysadmin group supports a satellite missions ops center that relies on software which only works on Solaris SPARC systems. The ops center currently has 22 Sunblade 1500's, one for each satellite used for data acquisition and commanding. The overall system is networked such that we have central name service, and storage, yet the actual workstations are used to control missions and acquire data. My plan is to replace each of these workstations with Solaris 10 branded containers, running on two T5120's setup in an HA configuration. Each container would use a Sunray as it's head for the satellite operators. There are many advantages to this setup, but it is critical that the containers reside in an HA environment.
What I would love to do is use Open HA to build the cluster, using the hardware minimized setup, so we don't need separate quorum hardware. We have limited funds. We already own the T5120's and some Sunrays, but don't have the cash for expensive shared storage and controllers. As it stands right now, we can't really build out a test environment, because the Solaris 10 branded zones don't work on snv_111b, and as I understand it, the current Open HA release won't work on the newer builds. So my hope is that there will be an Open HA release coincident with Opensolaris 2010.02. I also hope there will be a Solaris 10 branded zone that is compatible in 2010.02. Is this a reasonable expectation?
Of course, there are other problems with this setup:
System recovery scenarios: Since there's no boot CD for SPARC, recovering a system could be tricky. We will need a boot server within our operations center to recover these systems of they completely die. OTOH, hopefully there will be a SPARC boot CD for 2010.02.
System updates: These will need to be applied with extreme care, since we don't want to break the cluster. Unlike the current setup, all of our eggs will be in one basket on the Sunray/zone servers.
What am I not thinking about?
Thanks in advance for any thoughts/recommendations on this.
Jon
- _____/ _____/ / - Jonathan Loran - - - / / / IT Manager - - _____ / _____ / / Space Sciences Laboratory, UC Berkeley - ______/ ______/ ______/ AST:7731^29u18e3
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Posts:
52
From:
CN
Registered:
5/29/06
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Re: [ha-clusters-discuss] Possible to have a HA iSCSI cluster
(using ZFS) ?
Posted:
Nov 5, 2009 5:22 PM
in response to: andy.c
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You might need to send email to storage-discuss to query how well Solaris iSCSI target and COMSTAR support SCSI reservation and SCSI 3 PGR. I think if SCSI 2 reservation and SCSI3 PGR are supported well, you are suppose to setup a iSCSI HA cluster successfully.
Javen 2009/11/5 Andy Coates <andy dot coates at corealtitude dot com>
Hey,
I've been digging around for ages now trying to find the answer, but keep hitting old resources saying iSCSI targets not tested yet etc.
Basically is it possible yet to build a HA iSCSI cluster? There seems to be so many different projects that cover part of the process (e.g. COMSTAR) but I can't seem to find a way of combining it all to provide a fully redundant, seamless failover storage system.
The fact that products like Nexentastor exist seems to hint that its not possible with current open projects?
Thanks in advance,
Andy.
--
This message posted from opensolaris.org
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Posts:
305
From:
US
Registered:
3/9/05
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Re: [ha-clusters-discuss] [storage-discuss] Possible to have a HA
iSCSI cluster (using ZFS) ?
Posted:
Nov 6, 2009 8:00 AM
in response to: javen
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Javen Wu wrote: You might need to send email to storage-discuss to query how well Solaris iSCSI target and COMSTAR support SCSI reservation and SCSI 3 PGR. I think if SCSI 2 reservation and SCSI3 PGR are supported well, you are suppose to setup a iSCSI HA cluster successfully.
Yes, COMSTAR's LU provider supports SCSI 3 PGR, but this is a SCSI Target property.
HA iSCSI Clusters is an iSCSI Initiator side problem set, where not only is there a requirement for SCSI-3 PGR, but also HA support for the TCP/IP path between the iSCSI Initiator and iSCSI Target.
Javen
2009/11/5 Andy Coates <andy dot coates at corealtitude dot com>
Hey,
I've been digging around for ages now trying to find the answer, but keep hitting old resources saying iSCSI targets not tested yet etc.
Basically is it possible yet to build a HA iSCSI cluster? There seems to be so many different projects that cover part of the process (e.g. COMSTAR) but I can't seem to find a way of combining it all to provide a fully redundant, seamless failover storage system.
The fact that products like Nexentastor exist seems to hint that its not possible with current open projects?
Thanks in advance,
Andy.
--
This message posted from opensolaris.org
_______________________________________________
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Javen Wu
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Jim Dunham Engineering Manager Core I/O - COMSTAR Open Storage Systems Group Sun Microsystems, Inc.45 Network Drive Burlington, MA 01803 USA Phone x53360 / +1 (781) 730-4006 Email: James dot Dunham at Sun dot COM
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Posts:
4
From:
GB
Registered:
11/5/09
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Re: Possible to have a HA iSCSI cluster (using ZFS) ?
Posted:
Nov 9, 2009 1:42 AM
in response to: andy.c
To: Communities » ha-clusters » discuss
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After a *lot* of digging around trying to tie up COMSTAR and clustering I came across this:
http://docs.sun.com/app/docs/doc/820-7821/girgb?a=view
Is that not exactly what I'm after? I haven't got the hardware available right now to test it, but it *seems* to have most of the requirements?
Andy.
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Posts:
122
From:
DE
Registered:
5/30/07
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Re: [ha-clusters-discuss] Possible to have a HA iSCSI
cluster (using ZFS) ?
Posted:
Nov 9, 2009 1:50 AM
in response to: andy.c
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But you need Open Solaris and open HA Cluster right now, COMSTAR is not
available in Solaris 10 AFAIK.
Detlef
Andy Coates wrote:
> After a *lot* of digging around trying to tie up COMSTAR and clustering I came across this:
>
> http://docs.sun.com/app/docs/doc/820-7821/girgb?a=view
>
> Is that not exactly what I'm after? I haven't got the hardware available right now to test it, but it *seems* to have most of the requirements?
>
> Andy.
>
--
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Detlef Ulherr
Staff Engineer Tel: (++49 6103) 752-248
Availability Engineering Fax: (++49 6103) 752-167
Sun Microsystems GmbH
Amperestr. 6 mailto:detlef dot ulherr at sun dot com
63225 Langen http://www.sun.de/
*****************************************************************************
Sitz der Gesellschaft:
Sun Microsystems GmbH, Sonnenallee 1, D-85551 Kirchheim-Heimstetten
Amtsgericht München: HRB 161028
Geschäftsführer: Thomas Schröder, Wolfgang Engels, Wolf Frenkel
Vorsitzender des Aufsichtsrates: Martin Häring
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Posts:
24
From:
DE
Registered:
10/29/07
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Re: [ha-clusters-discuss] Possible to have a HA iSCSI
cluster (using ZFS) ?
Posted:
Nov 9, 2009 1:54 AM
in response to: andy.c
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Hi Andy,
the problem is, that the term "HA iSCSI" leaves lots of room for
interpretation.
I assume what you want to have is that you have a cluster that provides
HA services (but not necessarily HA iSCSI targets, which is a different
issue), using - probably - local disks within the cluster nodes via iSCSI.
This is indeed described in the doc that you mention below.
A much better description can be found in Thorsten's blog at:
http://blogs.sun.com/TF/entry/hochverf%C3%BCgbarkeit_mit_minimalem_cluster.
This is a blog entry in German but has a link to an English whitepaper
that has it all. It is a setup that uses local disks only.
Now HA iSCSI targets would be a different setup, namely configuring an
iSCSI target and making that HA. It seems to me that the iSCSI target
implementation uses some local(!) configuration files that would need to
be put on shared storage or put into the CCR to make it failover
succesfully.
I am not sure if anybody is working on this one.
Regards
Hartmut
On 11/09/09 10:42, Andy Coates wrote:
> After a *lot* of digging around trying to tie up COMSTAR and clustering I came across this:
>
> http://docs.sun.com/app/docs/doc/820-7821/girgb?a=view
>
> Is that not exactly what I'm after? I haven't got the hardware available right now to test it, but it *seems* to have most of the requirements?
>
> Andy.
>
--
Sun Microsystems GmbH Hartmut Streppel
Sonnenallee 1 Systems Practice
D-85551 Kirchheim-Heimstetten Phone: +49 (0)89 46008 2563
Germany Mobile: +49 (0)172 8919711
http://www.sun.de FAX: +49 (0)89 46008 2572
mailto: hartmut dot streppel at sun dot com
My BLOG: http://blogs.sun.com/Hartmut
SAP Infos: http://wikis.sun.com/display/SAPonSun/SAP+on+Sun
Sitz der Gesellschaft
Sun Microsystems GmbH, Sonnenallee 1, D-85551 Kirchheim-Heimstetten
Amtsgericht München: HRB 161028
Geschäftsführer: Thomas Schröder, Wolfgang Engels, Wolf Frenkel
Vorsitzender des Aufsichtsrates: Martin Häring
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Posts:
4
From:
GB
Registered:
11/5/09
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Re: [ha-clusters-discuss] Possible to have a HA iSCSI cluster (using ZFS) ?
Posted:
Nov 9, 2009 8:05 AM
in response to: hs86490
To: Communities » ha-clusters » discuss
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> Hi Andy,
> the problem is, that the term "HA iSCSI" leaves lots
> of room for interpretation.
So I see! :)
[snip]
> Now HA iSCSI targets would be a different setup,
> namely configuring an
> iSCSI target and making that HA. It seems to me that
> the iSCSI target
> implementation uses some local(!) configuration files
> that would need to
> be put on shared storage or put into the CCR to make
> it failover succesfully.
>
> I am not sure if anybody is working on this one.
Yeah that's what I'm after. Basically providing what hardware vendors like Dell (MD3000i/Equalogic etc) do, expect with the tools available with Open Solaris. Basically a high available iSCSI SAN.
Andy.
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Posts:
1
From:
Registered:
11/23/09
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Re: [ha-clusters-discuss] Possible to have a HA iSCSI cluster (using ZFS) ?
Posted:
Nov 23, 2009 1:35 PM
in response to: andy.c
To: Communities » ha-clusters » discuss
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I'm also trying to figure out how to provide Highly Available iSCSI services using opensolaris for an ESX cluster.
I am currently running a nexentaOS box providing NFS services to my ESX cluster.
I want to add in another box, change the setup to iSCSI and provide failover AND dynamic load balancing.
The openHA whitepaper seems to provide 80% of the setup required.
The part which is still missing is how do I configure the two boxes providing iSCSI to have the same iSCSI target IQN and how do I configured ESX's software initiator to round robin between the multipaths to the IQN's.
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