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RAID controller settings... safe?

post #1 of 38
Thread Starter 
Read caching, Write Caching and Command Queuing...

What do these do exactly? I get a small bump on average speed from them being off but i care about safety the most...
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post #2 of 38
If you really get better speeds by turning them off, let them stay off. If these are on and your computer suddenly shuts down, most of it is lost. Off for safety, and on for performance.

Though you should keep NCQ on if possible.
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post #3 of 38
Thread Starter 
Quote:
Originally Posted by gonX View Post
If you really get better speeds by turning them off, let them stay off.
Ok

Quote:
Originally Posted by gonX View Post
If these are on and your computer suddenly shuts down, most of it is lost.
What is lost? You are scaring me? So for safety it is good that I turned them off.

Quote:
Originally Posted by gonX View Post
Off for safety, and on for performance.
Wait, but I get the small performance boost with them off, not on...

Quote:
Originally Posted by gonX View Post
Though you should keep NCQ on if possible.
What is NCQ?
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post #4 of 38
NCQ is Native Command Queing.
    
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post #5 of 38
Thread Starter 
I only have "Enable Command Queuing"
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post #6 of 38
I wouldn't mess with all these settings if I were you, you are taking lots of risk for a marginal performance increase.
    
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post #7 of 38
Thread Starter 
That is what I am concerned with exactly.... which should I leave on for safety?

I was getting 134.4MB/s with all of them on so there is no need whatsoever for me to turn any of them off? As you'll see from the pictures the diferences are not worth any risk...

The first one is with Read and Write OFF and Queuing ON on the first channel only... which was the fastest and the current 2 x 7200rpm RAID0 record average speed.

But with Read and Write OFF but Queing ON, on both channels, I get the second picture... which seems a much better place to be with a significantly higher burst and only a hair lower average.


Again, I am concerned with safety first...
LL
LL
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post #8 of 38
Quote:
Originally Posted by USlatin View Post
Ok



What is lost? You are scaring me? So for safety it is good that I turned them off.



Wait, but I get the small performance boost with them off, not on...



What is NCQ?
You're supposed to get a performance increase with it on. Try the ATTO benchmark.

And yes, NCQ is Native Command Queuing, which you can disable, though it's only experimental.
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#well
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post #9 of 38
Thread Starter 
so do you thing my current settings are safe?
this gives me the best HDtach bench...

Both channels:
Read OFF
Write OFF
Queuing ON


I don't know why but I get no big Write (red) bars on ATTO...
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Staaayshon
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post #10 of 38
Quote:
Originally Posted by gonX View Post
You're supposed to get a performance increase with it on. Try the ATTO benchmark.

And yes, NCQ is Native Command Queuing, which you can disable, though it's only experimental.
NCQ isn't experimental. It is only useful in server environments with multiple users trying to access random data on a hard drive. What it does is rearrange the order of requests it has to do. It orders them so it can be more efficent. Let's say the HD is reading a piece of data in sector 109. It sees that there's another read request at sector 110 but there is a read request for sector 12 before it. Instead of going to sector 12 and then sector 110, NCQ reorders the commands so the HD would read sector 110 first since it is already close. NCQ is useful for only extremely random data request like multiple users. A desktop user cannot come close to the randomness that it is designed for. NCQ will usually slightly hurt performance for a single user.
Once again...
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Once again...
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