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

[Brian King]

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.

Can you explain from a high level how megaraid adds logical devices?
I assume a management app of some sort sends a command to the adapter
to create a disk array. What interface is used for this?
Does this trigger any notification from the adapter to the device
driver?

> Removing a drive:- There is no sane way for the application to map out
> drives to /dev/sd<x>. 

This information is all available in sysfs. Have you looked at libsysfs
at all?



--
Brian King
eServer Storage I/O
IBM Linux Technology Center

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