Nigel, I can't comment about the ESS-6800 comparison, but the 6800 is a speedy little box. We put ours in new and subsequently added another shelf after the fact. If you're careful about the logical disk layout you shouldn't have any problems.
The only got'cha I can offer is to check the firmware level of the box. IBM has specific instructions on upgrading, as far as what levels can be migrated to/from. Follow their recommendations! I know most of us have done z/OS upgrades outside of the IBM recommended levels and gotten away with it. These firmware upgrades aren't as forgiving. Also, if you need to do a level A-B-C upgrade to get current, don't do them back-to-back. I tried that and have the scars (although no t-shirt...). The upgrade hung halfway through the second part and I couldn't move forward or backward. IBM level 2 support finally got me going again and they chastised me for trying to do 2 upgrades essentially at the same time. They told me that I should have done the A-B upgrade, let the box sit for a few days to a week, then done the B-C upgrade. One other nit-picky thing that possibly could bite you if the seller pulled the GBICs - make sure you get them back in the right locations! It uses long-wave for the connection to the Z and short-wave to go between the enclosures. The GBICs are not very well marked (dark blue versus blackbands on the handles) and when we put ours in there was no documentation telling us that. We managed to get all 4 of the longwave GBICs misplaced and the Z couldn't see the 6800. Had both me and my CE scratching our heads for a while until I figured that one out. HTH Rex -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Nigel Salway Sent: Thursday, April 01, 2010 11:07 AM To: [email protected] Subject: ESS 2105-800 DS6800 comparison I am looking at migrating from an ESS 2105-800 shark to a used DS6800 1750-522. I am curious to learn if anyone has done a similar conversion and can comment on the relative performance of the two storage subsystems. The IBM redbook SG24-6781-02 says the DS6800 will out-perform the 2105-800 shark in most zOS implementations. I am also interested in hearing from someone who has installed a used DS6800 and if they had any issues installing and setting up the DS Storage Manager software. TIA ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
