Sga max size is not changed.

We use Oracle 11gr2 on win2008R2.
Our member said that he set sga max size by
alter system set sga_max_size scope=spfile; max size to 6GB.
And he restared that OS and DB instance , then
show parameters sga_max_size was 7.6GB.
we use dynamic SGA and automatic memory management.
Is it natural things ? If so, I would like to explaint about to our customer.
Why the show parameters sga_max_size was 7.6GB ?

DUPLICATE POST. please continue with our original post. Please mark this question answered and check the following link:
sga max size is different

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We use Oracle 11gr2 on win2008R2.
Our member set sga max size by
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And we restared that OS and DB instance , then
show parameters sga_max_size was 7.6GB
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I don't know why people are talking about RAID and other hardware issues when the question was about the SGA. To determine whether your SGA is the right size, you need to calculate the buffer cache hit ratio, the library cache hit ratio, and other SGA stats. Your library cache hit ratio should be over 90 percent unless your developers didn't use bind variables. Your buffer cache hit ratio depends on your application, but if it's below 80 percent I would look at the top ten offending SQL statements by disk reads, buffer hits, and CPU. That's just a start. I have scripts at home for doing these things in Oracle9i. I might respond with them this weekend.
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