https://community.hpe.com/t5/proliant-servers-ml-dl-sl/extending-arrays/m-p/2524151#M6241 Depends on the controller. . .Most controllers support it native using the array configuration utility. Simply add the drive, run the array configuration utility and choose the option to expand the existing array and you will then be able to select the new drive and it will expand on the fly . . .FYI update to the latest array controller ROM and ACU before you start. Wed, 02 May 2001 23:00:01 GMT Ayman Altounji 2001-05-02T23:00:01Z https://community.hpe.com/t5/proliant-servers-ml-dl-sl/extending-arrays/m-p/2524150#M6240 Can you extend a Raid 5 on a Compaq system to add one drive without losing the data on the Raid? Where can I find Documentation on this? Wed, 02 May 2001 23:00:00 GMT https://community.hpe.com/t5/proliant-servers-ml-dl-sl/extending-arrays/m-p/2524150#M6240 Ayman Altounji 2001-05-02T23:00:00Z https://community.hpe.com/t5/proliant-servers-ml-dl-sl/extending-arrays/m-p/2524151#M6241 Depends on the controller. . .Most controllers support it native using the array configuration utility. Simply add the drive, run the array configuration utility and choose the option to expand the existing array and you will then be able to select the new drive and it will expand on the fly . . .FYI update to the latest array controller ROM and ACU before you start. Wed, 02 May 2001 23:00:01 GMT https://community.hpe.com/t5/proliant-servers-ml-dl-sl/extending-arrays/m-p/2524151#M6241 Ayman Altounji 2001-05-02T23:00:01Z