how is disk added in Celerra? what is the impact? i assume that celerra
does not need to be brought down for this.

Thanks

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You are correct.  The Celerra does not need to be brought down to add
disk.  First present the disk to the Celerra in some manner dependent
on your backend configuration--  Symmetrix or Clariion, Integrated or
Gateway.  Then you can create the device files for them using the
server_devconfig command like so:

"server_devconfig ALL -list -scsi -disk"  -- this shows the current
devices (not the new ones).  Use this to compare against the later
"list" command

"server_devconfig ALL -probe -scsi -disk"  -- this interrogates the
backend for any new targets.  You should check the output here to see
that the new devices are found.

"server_devconfig ALL -create -scsi -disk"  -- this creates the device
nodes on the datamovers and controlstation

"server_devconfig ALL -list -scsi -disk"  -- compare with the first run
to see the disk that has been added.

Now you can create your volumes, and filesystems with either the
nas_volume/nas_fs commands or the Celerra Manager.

For more information check powerlink for the Celerra administration
guides.

HTH,
Aaron

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