No, I change settings to have usb-storage module loaded at boot time and I get 
the same result.
On the console, I have these messages about sdab (the virtual device)



Le 21/03/2016 15:18, Gottloeb, Jeff (ES & CSO) a écrit :
> Do you have the usb-storage kernel module disabled or uninstalled?  DSU (and 
> OMSA) up to v8.3 require this kernel module.  Found this out after a couple 
> of weeks of troubleshooting with Dell.
>
> Sent from my Windows Phone
> ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
> From: Jean-Daniel TISSOT <mailto:jean-daniel.tis...@univ-fcomte.fr>
> Sent: ‎3/‎21/‎2016 5:44 AM
> To: linux-poweredge@dell.com <mailto:linux-poweredge@dell.com>
> Subject: EXT :[Linux-PowerEdge] R720 DSU and iDRAC version
>
>
> Hi,
>
> This server is running CentOS release 6.7
>
> dsu --apply-upgrades-only show me a new version (2.30.30.30) for iDRAC with 
> Lifecycle Controller (2.21.21.21 installed).
> Booting on Lyfecycle and searching for new firmwares don't find anything to 
> upgrade.
> Searching on Dell Support web site for my Service Tag found only 2.21.21.21 
> version of iDrac.
>
> Runining dsu -u give me :
>
> |-----------Dell System Updates-----------|
> [ ] represents 'not selected'
> [*] represents 'selected'
> [-] represents 'Component already at repository version (can be selected only 
> if -e option is used)'
> Choose:  q - Quit without update, c to Commit, <number> - To Select/Deselect, 
> a - Select All, n - Select None
>
> [*]1  iDRAC
>  Current Version : 2.21.21.21 Upgrade to : 2.30.30.30
>
> Enter your choice : c
> Installing iDRAC-with-Lifecycle-Controller_Firmware_JHF76_LN_2.30.30.30_A00...
> Collecting inventory...
> .
> Running validation...
>
> iDRAC
>
> The version of this Update Package is newer than the currently installed 
> version.
> Software application name: iDRAC
> Package version: 2.30.30.30
> Installed version: 2.21.21.21
>
>
> Executing update...
> WARNING: DO NOT STOP THIS PROCESS OR INSTALL OTHER DELL PRODUCTS WHILE UPDATE 
> IS IN PROGRESS.
> THESE ACTIONS MAY CAUSE YOUR SYSTEM TO BECOME UNSTABLE!
> .........................................................................   
> USB Device is not found
> ...................................................................   USB 
> Device is not found
> ..................................................................   USB 
> Device is not found
> .........................
> Device: iDRAC
>   Application: iDRAC
>   Failed to access Virtual USB Device
>
> iDRAC-with-Lifecycle-Controller_Firmware_JHF76_LN_2.30.30.30_A00 could not be 
> installed
>
>
> Why the virtual device disconnect several time ? How to correct this problem ?
>
> Many thanks in advance.
>
> Cheers.
>
>
> -- 
> Bien cordialement, Jean-Daniel TISSOT 
> <http://chrono-environnement.univ-fcomte.fr/spip.php?article457>
> Administrateur Systèmes et Réseaux
> Tel: +33 3 81 666 440 Fax: +33 3 81 666 568
>
> Laboratoire Chrono-environnement <http://chrono-environnement.univ-fcomte.fr/>
> 16, Route de Gray
> 25030 BESANÇON Cédex
>
> Plan et Accès 
> <https://mapsengine.google.com/map/viewer?mid=zjsxW4ZzZPLY.kp2qPHUBD45c>

-- 
Bien cordialement, Jean-Daniel TISSOT 
<http://chrono-environnement.univ-fcomte.fr/spip.php?article457>
Administrateur Systèmes et Réseaux
Tel: +33 3 81 666 440 Fax: +33 3 81 666 568

Laboratoire Chrono-environnement <http://chrono-environnement.univ-fcomte.fr/>
16, Route de Gray
25030 BESANÇON Cédex

Plan et Accès 
<https://mapsengine.google.com/map/viewer?mid=zjsxW4ZzZPLY.kp2qPHUBD45c>
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