Hi msl,
OK, I would comment:
I had actually implemented HA-NFS on top of non-shared disks by
using block replication with AVS as you have tried. I did manage
the mounting/unmounting of the filesystem with HAStoragePlus
and would be interested in know how you managed it, because in
your earlier e-mails you kept saying that you did not wanna
use HAStoragePlus.
The solution i had mostly worked. What is really fascinating
and interesting is what "mostly" means in this context. i.e. What are
the kind of failure scenarios which do NOT work with this setup?
See the following thread for a lively discussion on this. Note that
the context there is DRDB, but the issues are very similar to AVS.
http://forum.java.sun.com/thread.jspa?forumID=842&threadID=5106409
In the end, if the solution works for YOU, it works. I'd say that
knowing about what the limitations of the solution are, is also very
important though.
PS: Can't believe it has been a year since that discussion on the
SDN forum, I remember it as if it was just yesterday!
HTH,
-ashu
msl wrote:
> Hello,
> I will try to concentrate in this post the informations about the
> configurations
> that i'm deploying, thinking that it should be usefull for somebody else..
>
> The objective of my tests is:
>
> High Availability services with ZFS/NFS on solaris 10 using a two-node Sun
> Cluster.
>
> The scenarios are two:
> 1) Using "shared discs" (global devices).
> 2) Using "non-shared discs" (local devices).
>
> - The solution (1) is more simple, and we can use the HAStoragePlus resource
> type
> that we can found in the SC 3.2 installation. And as the data are "unique",
> i mean,
> in a failover/switchback scenario the "same" disc will be used in one or
> another host, the practical purpose is clear.
>
> The HOWTO for ZFS/NFS HA using shared discs (global devices), can be found
> here:
> Sun Cluster 3.2 installation:
> http://www.posix.brte.com.br/blog/?p=71
>
> HA procedure for shared discs:
> http://www.posix.brte.com.br/blog/?p=68
>
> - The solution (2) maybe be more difficult to see the purpose... but i think
> are
> many:
> a) We can use it as a share of binaries. So the fact that the discs are not
> the
> "same", is not a real problem.
> b) We can use it in applications that does handle "loss of data", i mean,
> the app knows
> if the data is corrupt, and can restart its task. So, the application just
> needs a "share"
> (like a "tmp" directory).
> c) We will sync/replicate the data using AVS.
>
> So, i think ZFS/NFS/SC and AVS can let us use that local SATA discs that can
> be
> 300gb or 500gb, in a consistent way. Don't you think?
>
> The HOWTO for ZFS/NFS HA using non-shared discs (local devices), can be found
> here:
> AVS installation on Solaris 10 u3:
>
> http://www.posix.brte.com.br/blog/?p=74
>
> HA procedure for non-shared discs:
> Part I: http://www.posix.brte.com.br/blog/?p=73
>
> Part II: http://www.posix.brte.com.br/blog/?p=75
>
> I hope that information help somebody else with the same (crazy) ideas, like
> me.
> I will appreciate your comments!
>
> Thanks for your time.
>
> Leal.
> --
>
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