RE: How to add/drop SCSI drives from within the driver?

[Bagalkote, Sreenivas]

>
>On Wed, 2004-12-08 at 01:16, Bagalkote, Sreenivas wrote:
>> Adding a drive:- For application to use sysfs to scan newly added 
>> drive, it needs to know the HCTL (SCSI address - Host, 
>Channel, Target 
>> & Lun) of the drive. Driver is the only one that knows the mapping 
>> between a drive and the corresponding HCTL.
>
>The real way I'd like to handle this is via hotplug.  The 
>hotplug event would transmit the HCTL in the environment.  
>Whether the drive actually gets incorporated into the system 
>and where is user policy, so it's appropriate that it should 
>be in userland.

James, it is the application that is adding the drive. So it is not a
hotplug
event for the driver.

>
>This same infrastructure could be used by fibre channel login, 
>scsi enclosure events etc.
>
>We have some of the hotplug infrastructure in SCSI, but not 
>quite enough for this ... you'll need an additional API.
>
>> Removing a drive:- There is no sane way for the application 
>to map out 
>> drives to /dev/sd<x>. If application has a way of knowing 
>the HCTL of 
>> a deleted drive, then using that HCTL, it can match the 
>corresponding 
>> SCSI device name (/dev/sd<x>) and use sysfs to remove that drive.
>
>Since The sysfs device name contains H:C:T:L surely you can 
>just do a find on /sys?
>
>James
>
>

Thank you,
sreenivas
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