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#1 (**permalink**) 04-10-2008, 04:52 AM

Cris Carampa wrote:
> Is it possible that RAID0 is 6 times faster than RAID1? Since RAID0 has
> no fault tolerance, what is the RAID configuration that gives maximum
> performance and reliability? RAID10?

Short (same old) answer: it depends.
It's no surprise that RAID0 outperforms RAID1 expecially in the write
performance.
Fault tolerance is has its own overhead. A smart RAID controller takes
advantage in read operations in both cases, but it's definitely
different in write operations.
You have to check whether your db configuration or application dml
statements affect the performance tests (eg. they are the most frequent
operations).

Bye

--
Rodolfo Baselli
Wolters Kluver Italia Professionale
"I'm no supervising technician, I'm a technical supervisor." - Homer Simpson

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#2 (**permalink**) 04-10-2008, 04:52 AM

Rodolfo Baselli wrote:

> It's no surprise that RAID0 outperforms RAID1 expecially in the write
> performance.
> Fault tolerance is has its own overhead. A smart RAID controller takes
> advantage in read operations in both cases, but it's definitely
> different in write operations.
> You have to check whether your db configuration or application dml
> statements affect the performance tests (eg. they are the most frequent
> operations).

No DML operations were performed during my tests. I only measured the
time taken by a complex query to complete. The RAID0 server completed
the query in (RAID1 seconds)/6 seconds against the same data.

I know that RAID1 has write overhead, but I'm wondering whether is it
possible or impossible that RAID0 could perform 6 times better than
RAID1 on read operations.

Thank you. Kind regards,

--
Cris Carampa (cris119@operamail.com)
"E` evidente che siamo di fronte allo sfruttamento opportunistico
di quella quota di astensioni fatalmente derivanti da disinteresse
o indifferenza." (Gustavo Zagrebelsky)

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Re: RAID0 vs RAID1 vs RAID?