Hi Gorka

Definitely, the "AEN/AER" approach deserves a try, I will let you know if 
it's applicable for my situation.

For the sysfs way, do you mean echo a command to the host like below:

echo "c t l" > "/sys/class/scsi_host/host#/scan"


Thanks
Peter

在 2017年2月15日星期三 UTC+8下午11:52:19,Gorka Eguileor写道:
>
> On 15/02, Peter Wang wrote: 
> > Hi 
> > 
> > I am investing new ways to discover LUN exposed by iSCSI targets. 
> > 
> > Currently, most of tools/libs are using user land shell commands 
> "iscsiadm" 
> > to login targets or rescan new LUNs. 
> > sometimes, as I observed, the rescan is time-consuming. in 
> high-concurrency 
> > environment, the overhead by executing massive shell commands cannot be 
> > ignored. 
> > 
> > So, my question is: can we use socket or other efficient ways to trigger 
> > actions that we do with "iscsiadm"? 
> > 
> > Appreciate if you can help on this. 
> > 
> > Thanks 
> > Peter 
> > 
>
> Hi Peter, 
>
> I'm no expert, but if you are already logged in and your target supports 
> AEN/AER packets, then iscsid will automatically send a scan request to 
> discover changed LUNs, and if it doesn't support it you could use the 
> sysfs interface from your code and request a scan writing "c t l" (where 
> c=channel t=target l=lun and wildcard - can be used) to 
> /sys/class/scsi_host/host#/scan. 
>
> I know this is not what you were looking for, but maybe it can alleviate 
> your issues until someone with more knowledge gives you the silver 
> bullet you wanted. 
>
> Cheers, 
> Gorka. 
>

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