How to select the storage and raid level

Currently, there are many disk storage products, generally using high-performance fiber channel connections,

Such as IBM storage products: http://www-900.ibm.com/storage/cn/disk/

HP Storage products: http://h20427.www2.hp.com/products/storage/cn/zh/enterprisestorage.asp

 

Select the raid level: the mainstream is RAID 0/1/5.

For database operations such as small Io, such as ERP, raid1 + 0 is recommended, while large file storage, data warehouse, for example, from the perspective of space utilization, we recommend that you use raid5.

RAID5 has at least three disks.

How do I select 0 + 1 or 1 + 0 for raid 10 at least 4 disks?

Raid0 + 1 cannot be damaged by one hard disk in RAID 0 on both sides, but two hard disks can be damaged simultaneously on one side.

Creation Method: each two disk drives are first madeRAID 0, Put two moreRAID 0MadeRaid 1, This isRaid 1 over RAID 0:

(RAID 0) A = drive A1 + drive A2 (striped)
(RAID 0) B = drive B1 + drive B2 (striped)
Raid 1 = (RAID 1) A + (RAID 1) B (mirrored)

Raid1 + 0(RAID 0 over RAID 1)One hard disk can be damaged in Raid 1 on both sides, but not one hard disk can be damaged at the same time.

Creation method:Make each two disk drives firstRaid 1, Put two moreRaid 1MadeRAID 0, This isRAID 0 over RAID 1:

References:

 Http://storage.it168.com/h/2007-06-12/200706121108656.shtml]

Http://www.fix.com.cn/data-recovery/post/25.htm

(RAID 1) A = drive A1 + drive A2 (mirrored)
(RAID 1) B = drive B1 + drive B2 (mirrored)
RAID 0 = (RAID 1) A + (RAID 1) B (striped) conclusion: because raid1 + 0 is greater than 0 + 1 high reliability. Therefore, we recommend that you use RAID 0 + 1/raid 10 During architecture, RAID 1 , and then RAID 1 RAID 0 .