dtrace discuss - May 2009 - [storage-discuss] Which iSCSI targets are pulling the most

> Jake,
> 
> >>>> For OpenSolaris 11/08, you are using the iSCSI
> >> Target Daemon, and
> >>>> thus a means to look inside the daemon as to
> what
> >> is doing can be
> >>>> accomplished by DTrace:
> >>
> http://www.solarisinternals.com/wiki/index.php/DTrace_
> >> Topics_iSCSI
> >
> >
> > Goodness, this is the most compelling reason yet
> for me to finally  
> > learn DTrace.
> 
> Excellent !
> 
> >>> Is there a COMSTAR/itadm equivalent of ''iscsitadm
> >> show stats''
> >>> equivalent for snv_112+? That was very handy.
> >>
> >> No, there is no ''stat'' command available for the
> >> iSCSI Target in
> >> COMSTAR.
> >
> >
> > But just to allow me to procrastinate a moment
> longer on that ;),  
> > does anyone know if the 112 ON stuff with ''iscsiadm
> stat''  
> > functionality will be included in the OS2009.06
> release?  And does  
> > ''iscsitadm stat'' allow one to see the current,
> immediate utilisation  
> > by the various targets?
> 
> No it will not. iscsitadm is the CLI for
> administering the iSCSI  
> Target Daemon (iscsitgtd). In due time software
> associated with this  
> daemon will be removed from OpenSolaris, as the
> future for iSCSI and  
> other SCSI based targets is COMSTAR.
> 
> The CLIs associated with COMSTAR and its
> administration of SCSI  
> Targets and associated LUNs do not include ''stat''
> like command options.
> 
> Preliminary work is underway to add kstats to
> COMSTAR, but this is  
> just the means to make available raw statistics,
> which can be obtained  
> with the ''kstat'' CLI, or libkstat.so At that point
> additional  
> consideration can be given to enhance the CLI
> ''iostat'', or other CLI  
> options to gain administrator observability into
> COMSTAR and its  
> various SCSI Targets.
> 
> Jim
> 


This DTrace is addicting -- It''s my first taste and I already want
more!  I''m immediately covetous of a dtrace that''ll give me
output similar to the iscsiio.d script mentioned above, but list it by target
instead of ip address.  Would anyone be willing to walk through making this mod
with me?

tia
jake
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