Hello

JBOD is a mode, so if the controller is in that mode you would use JBOD in commands that state the mode. I don't think the H730 is capable of JBOD mode. The two modes I'm aware of that the H730 supports are RAID and HBA. Controller write caching is not supported on non-RAID drives.

perccli /c0 show jbodwritecache

If you run that command it should state that it is not supported on this controller. If it states something else let me know.

http://www.dell.com/storagecontrollermanuals/

Thanks

We can see write cache is enabled when 'jbodwritecache=on', but which of RAID Controller cache or HDD cache is used?

[root@T630 ~]# perccli /c0 show jbodwritecache
Controller = 0
Status = Success
Description = None

Controller Properties :
=====================

--------------------------
Ctrl_Prop Value
--------------------------
JBOD Write Cache Disabled
--------------------------

[root@T630 ~]# perccli /c0 set jbodwritecache=on
Controller = 0
Status = Success
Description = None

Controller Properties :
=====================

-----------------------
Ctrl_Prop Value
-----------------------
JBOD Write Cache ON
-----------------------

[root@T630 ~]# perccli /c0 show jbodwritecache
Controller = 0
Status = Success
Description = None

Controller Properties :
=====================

-------------------------
Ctrl_Prop Value
-------------------------
JBOD Write Cache Enabled
-------------------------

[root@T630 ~]# sdparm /dev/sda |grep WCE
WCE 1 [cha: y, def: 0, sav: 0]
[root@T630 ~]# perccli /c0 set jbodwritecache=off
Controller = 0
Status = Success
Description = None

Controller Properties :
=====================

-----------------------
Ctrl_Prop Value
-----------------------
JBOD Write Cache OFF
-----------------------

[root@T630 ~]# sdparm /dev/sda |grep WCE
WCE 0 [cha: y, def: 0, sav: 0]
[root@T630 ~]#

That should be a controller command to controller 0 that is in personality mode JBOD. The use of the JBOD command does not appear to be fully documented. I would have to test in the lab to be certain of how it works.

I suggest running these commands:

perccli /c0 show personality

That will show the personality mode that controller 0 is set.

perccli show

That should list your controllers. When you are using /cx it is not specifying a controller. Using something like /c0, /c1, etc specifies the controller number. We have been running commands against controller 0. Several commands will require specifying a controller.

I am also curious what the output of this command is:

perccli /c0 show jbod

Thanks