Re: Adding a new FC disk to a linux host

[Steven Dake <sdake@mvista.com>]

you can scan specific scsi ids.  read scsi_proc.c search for 
add-single-device

         * Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
         * with  "0 1 2 3" replaced by your "Host Channel Id Lun".
         * Consider this feature BETA.


Good luck
-steve

Suresh Kr N wrote:

>sorry about the wrong thread name in the previous post. updated now
>
>
>hi everyone
>
>I am working on a san management application for a linux. My application
>sends zoning commands to the fabric to zone in a disk to a host ,  so i need
>to have that disk acessible to the host without a reboot of the host.
>
>I need to do this from the user space. Is there a way to ask the scsi
>midlayer for a rescan ?
>In solaris , i invoke a command called "drvconfig" to achieve this.
>
>I have seen in the linux-scsi archive that this is kind of possible,  but
>the discussion didnt seem to state how.
>I am attaching the above thread here in the mail.
>
>I have verified that echo "scsi add-single-device a b c d" > /proc/scsi/scsi
>works fine . But this does involve parameters which cant be found out
>programmatically.
>
>Also a side question here :In a FC world, to get the target number for above
>command , can i find out the current maximum target number of the scsi
>devices, and increase it by one ? or  does the FC devices have actually a
>preknown target no , which would be collected by the FC card driver ?
>
>Could someone please help ? ( even a "non-standard" way should be good
>enough" )
>
>Thanks
>Suresh
>
>
>
>--------------------------------------------------------
>Message 2 in thread
>From: Alan Cox (alan@lxorguk.ukuu.org.uk)
>Subject: Re: Hot plugging a disk in runtime
>View this article only
>Newsgroups: mlist.linux.scsi
>Date: 2002-05-20 05:32:38 PST
>
>
>  
>
>>1.. How is it possible to signal SCSI mid-layer (or other layers) of a
>>presence of a newly hot-plugged disk ?
>>    
>>
>
>aacraid is one example that does this, but via its config tools.
>
>  
>
>>2.. Can an adapter's device driver trigger SCSI subsystem to scan
>>channels for new LUNs / Targets ?
>>    
>>
>
>It is designed so user space can do so - so yes
>
>  
>
>>3.. Is this can be handled in a kernel level ? is there a user space
>>application that can be triggered to start scanning adapters (obviously
>>through SCSI subsystem) and registering new LUNs / Targets etc... ?
>>    
>>
>
>echo "scsi-add-single-device a b c d" /proc/scsi/scsi
>
>if I remember it right
>
>
>entire thread is at
>
>http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&threadm=linux.scsi.200205
>201420.g4KEK3x01892%40localhost.localdomain&rnum=7&prev=/groups%3Fq%3Dhot%2B
>plug%2B%2BSCSI%2Bfibre-channel%2BLinux%26hl%3Den%26lr%3D%26ie%3DUTF-8%26selm
>%3Dlinux.scsi.200205201420.g4KEK3x01892%2540localhost.localdomain%26rnum%3D7
>
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>
>  
>