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Thanks, Graham. Turns out, that's pretty much the same procedure. Sure enough, the expansion unit has a newer firmware version, so it isn't recognized until the main unit has its firmware updated. It sounds like in the past, these units would just start up even if the firmware versions were different. Now, it seems to have some safety built-in. Fortunately, all the firmware updating can be done live since we have two controllers and I/O can be moved back and forth between controllers while the firmware is updated on each. …adam On May 14, 2013, at 10:13 AM, Graham Stewart <[log in to unmask]> wrote: > 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 > 416-978-6337 > > > 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. >> 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.