How much capacity is used up when using RAID 10?

Question

Hi all,

I was wondering, when using RAID 10, how much capacity was taken up. I think RAID 10 uses 2 disks for parity purposes. Correct me if I am wrong though. But I was wondering specifically when using RAID 10 with 73's and 1 TB drives how much capacity was taken up? I want to find this out so I can calculate what the total storage using RAID 10 is with both of those drives. Example: 146's using RAID 5 have usable capacity =4x133.65 GB = 534.59 GB
and so on. I am also using 10 disks in the RAID 10 if that helps.

Thanks,

PJK

nandas · Accepted Answer

Hi PJK,RAID 10 does not have any parity calculation - it is basically Striped Mirroring.The RAID overhead is the same as of Mirroring (RAID 1) - that means half of the available disk capacity will be lost for mirroring. If you have not already seen this document, I recommend you to go through the following Technical White Paper available on powerlink -'EMC CLARiiON Fibre Channel Storage Fundamentals - Technology Concepts and Business Considerations'http://powerlink.emc.com/km/live1/en_US/Offering_Technical/White_Paper/H1049_emc_clariion_fibre_channel_storage_fundamentals_ldv.pdfThe document describes different RAID technologies, considerations for performance, considerations for reliability and redundancy and more.Also you may refer to the 'EMC CLARiiON Best Practices for Fiber Channel Storage - Best practices planning guide' for more information and guidelines.Hope this helps,Sandip

rr_phx · Answer

Raid 10 is basically Striping and Mirroring the data across the drives. So, 10 FC146 drives in a Raid1/0 would be:5x133.65 GB = 668.25 GB

CLARiiON

How much capacity is used up when using RAID 10?

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