Re: Question about iSCSI / NAS / Cluster

Francisco,
  This sounds very similar to the issue I encountered when trying to backend
a shared SAN connection. The problem that
I ran into was that this shared area would need to be configured as a shared
file system such as GFS that is not available
for FreeBSD. I did get concurrent connections, but bad things happened.

  There is package that is available for FreeBSD (ifstated) that reportedly
will aid you with knowing when a carp status changed, but
I personally never got it to work properly due to time constraints.

  My original solution that I still use is a script that looks at the carp
device info from ifconfig and reports MASTER or BACKUP.
This can be executed periodically by a script to have the new master mount
the shared resource and the non-master give it up.
This is far from ideal, but works in instances where immediate fail over is
not required. This is designed to be called from a shell
script via backtick.

STATUS=`./carpstatus.pl`
if [ $STATUS = "MASTER" ] ; then
.....
fi

(carpstatus.pl)
#!/usr/bin/perl
# $output = `ifconfig | grep carp: | grep vhid | /usr/bin/awk '{print \$2}'`
;
# chomp($output) ;
# print "$output" ;

  I hope this helps you with your issue.

Bob McClure



On Mon, May 25, 2009 at 9:39 AM, Francisco Cabrita <
[email protected]> wrote:

> Hi,
>
> I don't know if this ML is the right place to post a question about
> NAS/iSCSI and Cluster related issue. I will write it anyway.
>
> info:
> I have built a NAS server under FreeBSD. Geom RAID5 over 3 hard disks and
> iSCSI target0 created.
> It is up and running without problems "exporting" a SCSI driver to a Ms
> Windows 2000 Server with Microsoft iSCSI Inititator driver.
> The volume is NTFS.
>
> doubt:
> I have read multiple "old" posts around the web that I can't connect
> multiple initiators (w2k clients) to the same target. Is this true
> nowadays?
>
> Facts:
> I really need at least two w2k clients to the same "storage NAS". Any tip
> about how to solve this?
> Maybe some kind of failover technique between both w2k servers?
>
> I really appreciate your help. Thanks in advance
>
> Best Regards
> Francisco
>
> PS: I sent this email to freebsd-scsi ML too. No anwsers until now.
>
> --
> blog: http://sufixo.com/raw
> http://www.linkedin.com/in/franciscocabrita
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