We used to run IBM FastT 600 storage servers here, which are the 
ancestors of the DSXXXX series, using the same Ingenio controllers.

With those you could add expansions units without downtime. The 
procedure involved cabling up the the new units, then powering them on, 
then, once recognized, inserting the disks a couple at a time, waiting 
until they are recognized.

Of course, advice from IBM support would be a good idea :-) ... For 
example IBM would sometimes caution that firmware in the new ESMs could 
be at a higher level that the existing ESMs, and could cause problems.

Best of luck!
Graham Stewart
Network and Storage Services Manager
Information Technology Services
University of Toronto Libraries

On 13-05-14 09:59 AM, Adam Wead wrote:
> Hi all,
> Hardware question for anyone with experience using IBM products.
> I have a DS3500 disk array with dual controllers.  I've installed an expansion unit, with dual ESMs, and want to connect it up with the array without having to power everything down.
> I'm almost positive I can do this, but haven't been able to find a definitive answer.  Can anyone speak to this from experience?  Are there any special procedures or pitfalls?
> Thanks in advance,
> …adam
> ______________________________
> Adam Wead
> Systems and Digital Collections Librarian
> Library + Archives
> Rock and Roll Hall of Fame and Museum
> 216.515.1960
> [log in to unmask]
> This communication is a confidential and proprietary business communication. It is intended solely for the use of the designated recipient(s). If this communication is received in error, please contact the sender and delete this communication.