So with Compellent all data is striped across all disks. If you have 24 disks, and assign 2 as Hot Spares you will have 22 disks left to configure. When you configure RAID you will either set single or dual redundancy. Either way the RAID parity is striped across all disks. So all disks have Raid Extents in them whether it is Single Redundancy (Raid 10, Raid 5-5, Raid 5-9) or dual Redundancy (Raid 10 DM, Raid 6-6, Raid 6-10). Dual Redundancy is required for disks larger than 1.9 TB in size. If your disks are smaller than you could use Single Redundancy. Reference page 8 of: Understanding RAID with Dell SC Series Storage [URL]
Hi, I have a question regarding the compellent default RAID levels (RAID 5-5, 5-9,6-6, 6-10), for example if I design SC4020 with 24 disks: Q#1 If I configure dual redundancy with RAID level RAID 6-10, does it mean that there will be two sets of RAID 6 on each 10 disks? if yes then what happens to the remaining 4 disks? Q#2 If I configure dual redundancy with RAID level RAID 6-6, does it mean that there will be 4 sets of RAID 6 on each 6 disks? if yes then total parity disks will be 2+2+2+2=8?
Compellent default RAID Options | Disk quantity sizing