Re: [Scst-devel] scstadmin / scst.conf and online changes

[Scott T. <sw...@te...>]

On Fri, 5 Feb 2016, Bart Van Assche wrote:

> On 02/05/2016 02:07 PM, Scott Talbert wrote:
>> To make online changes to the SCST configuration, I have been editing the
>> scst.conf file and then using 'service scst reload' which does a
>> 'scstadmin -config <scst.conf>' and reloads the configuration without
>> having to restart the daemon.  An example type of change I'm making is
>> removing a LUN in a TARGET and replacing it with another.  Is this a
>> supported way of doing things?  The reason I ask is that it doesn't seem
>> to work quite right.  Or do I really need to be issuing scstadmin commands
>> (ie, -rem_lun and then -add_lun) to do this type of operation?
>
> Hello Scott,
>
> There is a sophisticated algorithm in scstadmin that computes the difference 
> between the old and new configuration and only applies the changes in the 
> scenario you explained. If you can provide the old and new configuration we 
> can see whether we can reproduce this behavior and determine what went 
> wrong.

I've attached my "before" and "after" configs.

This is all that I'm changing:

2,3c2,3
<         DEVICE disk_bmpxva298d {
<                 filename 
/media/098d3a96-fd0c-f44b-87c7-8cc3150dd02d/iscsidisk_xct108vaa94649
---
>         DEVICE disk_beknwd12c9 {
>                 filename 
/media/098d3a96-fd0c-f44b-87c7-8cc3150dd02d/iscsidisk_63ymgo0cc164f8
35c35
<                 LUN 0 disk_bmpxva298d
---
>                 LUN 0 disk_beknwd12c9

Regards,
Scott