RE: udev does not create scsi disk entries during bootup

["Surekha.PC" <surekhap@cisco.com>]

>The 'tree' function is much nicer for seeing things like this :)

 Is this a utility? Appreciate if you can inform me where to get it.

>> Here sda, sdb are my native scsi disks while sdc, sdd are iSCSI
disks.

>Why is your iscsi host controller haning off of the legacy bus?  Isn't
it connected to a >ethernet device in reality?  You should link it to
that.

iSCSI is a pseudo SCSI HBA, it is registered with Scsi_Host template
just like any native SCSI HBA. Since there isn't any pci bus associated
with it, it appears on legacy bus.


>> I am able to manually create the device nodes for iSCSI disks with 
>> udev.
>> 
>> Making udev work with hotplug is the only issue now :(

>Don't know why it isn't working for you.  Does any other devices work
>with hotplug?   What distro are you using?  Can you install the hotplug
>rpms instead of using the tarballs?

I have native scsi disk devices on my system. These are not tested for
hotplugging since it requires to build udev with initrd, which I am yet
to test with.

I am using Redhat 9.0 with linux-kernel 2.6.0-test5.

I was not able to install from rpm, rpm on 2.6 kernel has an issue, it
gives following error and fails... That's another issue.
------------------------------------------------------------------------
--------------
rpmdb: unable to join the environment
error: db4 error(11) from dbenv->open: Resource temporarily unavailable
error: cannot open Packages index using db3 - Resource temporarily
unavailable (11)
error: cannot open Packages database in /var/lib/rpm
------------------------------------------------------------------------
--------------

I have one more query. I happened to read from the URL mentioned below,
that hotplugging can be achieved by plugging/unplugging the scsi device
and executing the following command. 

echo "scsi add-single-device <h> <c> <t> <l>" > /proc/scsi/scsi
echo "scsi remove-single-device <h> <c> <t> <l>" > /proc/scsi/scsi

h - host number
c - channel
t - target
l - lun

http://lwn.net/Articles/12723/

Hope this is not all about scsi hotplugging ? I presume that hotplugging
should not take any user input and should be completely automated.

Thanks,
surekha 



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