On Sep 25, 2012, at 1:32 PM, Jim Klimov <jimkli...@cos.ru> wrote:

> 2012-09-26 0:21, Richard Elling пишет:
>>> Does this mean that importing a pool with iSCSI zvols
>>> on a fresh host (LiveCD instance on the same box, or
>>> via failover of shared storage to a different host)
>>> will not be able to automagically share the iSCSI
>>> targets the same way as they were known in the initial
>>> OS that created and shared them - not until an admin
>>> defines the same LUNs and WWN numbers and such, manually?
>>> Is this a correct understanding (and does the problem
>>> exist indeed), or do I (hopefully) miss something?
>> That is pretty much how it works, with one small wrinkle -- the
>> configuration is stored in SMF. So you can either do it the hard
>> way (by hand), use a commercially-available HA solution
>> (eg. RSF-1 from high-availability.com <http://high-availability.com>),
>> or use SMF export/import.
>>  -- richard
> So if I wanted to make a solution where upon import of
> the pool with COMSTAR shared zvols, the new host is able
> to publish the same resources as the previous holder of
> the pool media, could I get away with some scripts (on
> all COMSTAR servers involved) which would:
> 1) Regularly "svccfg export" certain SMF service configs
>   to a filesystem dataset on the pool in question.

This is only needed when you add a new COMSTAR share.
You will also need to remove old ones. Fortunately, you have a 
pool where you can store these :-)

> 2) Upon import of the pool, such scripts would "svccfg
>   import" the SMF setup, "svcadm refresh" and maybe
>   "svcadm restart" (or "svcadm enable") the iSCSI SMF
>   services and thus share the same zvols with same
>   settings?

Import should suffice.

> Is this a correct understanding of doing "shareiscsi"
> for COMSTAR in the poor-man's HA setup? ;)


> Apparently, to be transparent for clients, this would
> also use VRRP or something like that to carry over the
> iSCSI targets' IP address(es), separate from general
> communications addressing of the hosts (the addressing
> info might also be in same dataset as SMF exports).

Or just add another IP address. This is how HA systems work.

> Q: Which services are the complete list needed to
>   set up the COMSTAR server from scratch?

Dunno off the top of my head. Network isn't needed (COMSTAR
can serve FC), but you can look at the SMF configs for details.

I haven't looked at the OHAC agents in a long, long time, but you
might find some scripts already built there.
 -- richard

illumos Day & ZFS Day, Oct 1-2, 2012 San Fransisco 

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