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

[James Bottomley]

On Fri, 2005-01-21 at 17:11 -0500, Mukker, Atul wrote:
> All right! The implementation is complete for this and the driver has
> thoroughly gone through testing. Everything looks good except for a minor
> glitch.

That's good news.

> After the new logical drives are created with "- - -" written to the
> scsi_host scan attribute, there is a highly noticeable delay before device
> names (e.g., sda) appears in the /dev directory. If the management
> application tried to access the device immediately after creating new, the
> access fails. Putting a 1 second delay helped, but of course this is not a
> deterministic solution.
> 
> What are the other possibilities?

Well, how about hotplug.  The device addition actually triggers a hot
plug event already (there's no need to add anything, it's done by the
mid-layer), so if you just listen for that, you'll know when the scan
has detected a device.

James


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