https://community.hpe.com/t5/disk-enclosures/redundancy/m-p/2496391#M1315 Sure - install the second controller in the slot right next to the original 4250ES, run setup and then load the redundancy driver from the NT 4.0 SSD:<BR /><BR /><A href="http://www5.compaq.com/support/files/server/us/download/9192.html" target="_blank">NT 4.0 SSD</A> Tue, 03 Apr 2001 23:00:00 GMT Ayman Altounji 2001-04-03T23:00:00Z https://community.hpe.com/t5/disk-enclosures/redundancy/m-p/2496390#M1314 I recently setup a Proliant 8000 using a 4250es controller. <BR />There are 7 -18gb drives total. Array A consists of 3 -18gb drives using RAID 5. Array B consists of 3 -18gb drives with a 4th used as an on-line spare. <BR /> <BR />My question is as follows. Can I add a second 4250es <BR />controller for redundancy without erasing the current configuration? <BR />If so, what steps do I need to take? Wed, 21 Feb 2001 00:00:00 GMT https://community.hpe.com/t5/disk-enclosures/redundancy/m-p/2496390#M1314 Ayman Altounji 2001-02-21T00:00:00Z https://community.hpe.com/t5/disk-enclosures/redundancy/m-p/2496391#M1315 Sure - install the second controller in the slot right next to the original 4250ES, run setup and then load the redundancy driver from the NT 4.0 SSD:<BR /><BR /><A href="http://www5.compaq.com/support/files/server/us/download/9192.html" target="_blank">NT 4.0 SSD</A> Tue, 03 Apr 2001 23:00:00 GMT https://community.hpe.com/t5/disk-enclosures/redundancy/m-p/2496391#M1315 Ayman Altounji 2001-04-03T23:00:00Z