SqlServer 2005 读书笔记 3 - raid
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Raid
Striple&Mirror
Raid0 - Striple
Raid1 - Mirror
Raid10 - Striple&Mirror
Raid5 - Striple&Parity
Performance&Capacity
Read(R) Write(R) IO/Disk Capacity
Raid0 n n IO/n t
Raid1 2(split seek) 1(cache) read/2+write t/2
Raid10 n n/2 read/n+write*2/n t/2
Raid5 n n/4 read/n+write*4/n t*n/(n-1)
<10% write operation - raid5
>10% write opeateion - raid10
Parity for raid5
each write opearion involves 4 IO,sequences:
1.IO occurs to raid controller
2.Read the old data
3.Read the partiy data
4.Cal new parity bit - #2 xor #3
5.Write new data
6.Write new parity data
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