https://community.hpe.com/t5/disk-enclosures/raid-1-0/m-p/2607098#M3213 If you use the ACU to configure an array of an even number of drives more than 2, then the RAID 1 option is replaced by a RAID 0+1 option automatically. Tue, 27 Nov 2001 00:00:00 GMT Ayman Altounji 2001-11-27T00:00:00Z https://community.hpe.com/t5/disk-enclosures/raid-1-0/m-p/2607097#M3212 As per the documentation, Raid 1+0 is available on the 53xx. I've setup numerous RAID1 and RAID5 systems, but never a RAID 1+0. Is this one of the selectable options within the ACU or ORCA utility? I don't recall ever seeing this, but apparently is do-able. Any help or prior experiance greatly appreciated ! Mon, 05 Nov 2001 00:00:00 GMT https://community.hpe.com/t5/disk-enclosures/raid-1-0/m-p/2607097#M3212 Ayman Altounji 2001-11-05T00:00:00Z https://community.hpe.com/t5/disk-enclosures/raid-1-0/m-p/2607098#M3213 If you use the ACU to configure an array of an even number of drives more than 2, then the RAID 1 option is replaced by a RAID 0+1 option automatically. Tue, 27 Nov 2001 00:00:00 GMT https://community.hpe.com/t5/disk-enclosures/raid-1-0/m-p/2607098#M3213 Ayman Altounji 2001-11-27T00:00:00Z