https://community.hpe.com/t5/disk-enclosures/431-extension-expansion-workaround/m-p/2527212#M1871 I have the same situation. I tried the workaround you described. Don't worry, failing and replacing on line the drive is a safe job. But when I tried to expand the array, ACU is still saying that it cannot expand it because it was made with a different controller!! ARGH. <BR />Now I'm gonna call Compaq support... Sun, 20 May 2001 23:00:00 GMT Ayman Altounji 2001-05-20T23:00:00Z https://community.hpe.com/t5/disk-enclosures/431-extension-expansion-workaround/m-p/2527211#M1870 I have a Proliant 1600 Server 384 meg ram. Presently running a 221 raid controller. All upgraded with SS 4.80 <BR />Raid 5 array, 3 drives. wideultra 2. <BR /> <BR />On advice from tech support we purchased a 431 controller as an upgrade as it supported both array expansion and logical drive extension. <BR />We have since come to find out that the initial array must have been created on the 431 raid controller to allow these features. <BR />In speaking with some support people, we have a proposed work around for this type of situation. <BR />Backups should be done as advised by Compaq. <BR />1. install the 431 controller and drivers. <BR />2. remove the 221 controller. <BR />3. attach the raid array from the 221 controller to the 431 controller. <BR />4. fail one of the drives in the array. <BR /> This is the proposed part <BR />5. insert new drive, the 431 will rebuild it as a 431 raid array would have been built on a new array, not as a 221 controller (the old controller) <BR /> <BR />Since it cannot have only one drive with this configuration, all the drives in the array will be updated to have an additional 5 meg each reserved for the Raid controller. This is made possible because the new drive has enough room to get the ball rolling for the configurations. I am told the controller is smart enough to do the job and modify the rest of the drives to allow the configuration to be complete and theroretically error free. <BR /> <BR />Please, if anyone has any information or tried this procedure, let me know. <BR /> <BR />John Thu, 10 May 2001 23:00:00 GMT https://community.hpe.com/t5/disk-enclosures/431-extension-expansion-workaround/m-p/2527211#M1870 Ayman Altounji 2001-05-10T23:00:00Z https://community.hpe.com/t5/disk-enclosures/431-extension-expansion-workaround/m-p/2527212#M1871 I have the same situation. I tried the workaround you described. Don't worry, failing and replacing on line the drive is a safe job. But when I tried to expand the array, ACU is still saying that it cannot expand it because it was made with a different controller!! ARGH. <BR />Now I'm gonna call Compaq support... Sun, 20 May 2001 23:00:00 GMT https://community.hpe.com/t5/disk-enclosures/431-extension-expansion-workaround/m-p/2527212#M1871 Ayman Altounji 2001-05-20T23:00:00Z