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PERC 5/i RAID Card: Tips and Benchmarks - Page 272

post #2711 of 7173
Quote:
Originally Posted by ShadowFox19 View Post
Thanks for anwsering my question!

What settings do you use with your setup?
No prob man

My setup is optimized for storage with slight redundancy:
8x WD Black 1TB in RAID5, Stripe Size: 512KB, Disk Cache Policy: Enabled, Write policy: Write Back, Read Policy: Always Read Ahead (not adaptive), IO Policy: Cached I/O

Rebuild, Patrol, Reconstruction, BGI, and Consistency Check rates all set to 30 (which is default, i havent tweaked those much)

I manually set my cache flush rate to 15 seconds using the command line MegaCLI tool, the default I believe is 3 seconds. With a higher cache flush rate, the performance goes up, but if you go too high there is a risk of lost data. 15 seconds seems like a good middle of the road, as 3 seconds is far too conservative for me
    
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post #2712 of 7173
Quote:
Originally Posted by DJZeratul View Post
No prob man

My setup is optimized for storage with slight redundancy:
8x WD Black 1TB in RAID5, Stripe Size: 512KB, Disk Cache Policy: Enabled, Write policy: Write Back, Read Policy: Always Read Ahead (not adaptive), IO Policy: Cached I/O

Rebuild, Patrol, Reconstruction, BGI, and Consistency Check rates all set to 30 (which is default, i havent tweaked those much)

I manually set my cache flush rate to 15 seconds using the command line MegaCLI tool, the default I believe is 3 seconds. With a higher cache flush rate, the performance goes up, but if you go too high there is a risk of lost data. 15 seconds seems like a good middle of the road, as 3 seconds is far too conservative for me
Wow, thanks for sharing your settings!
How would you suggest setting mine up if I want everything very secure?
    
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post #2713 of 7173
Quote:
Originally Posted by ShadowFox19 View Post
Wow, thanks for sharing your settings!
How would you suggest setting mine up if I want everything very secure?
for data security, raise the patrol read and consistency check to say, 40% and drop the others by 5%, respectively. This will ensure it is checking your data for consistency more often and correct errors if necessary.
    
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post #2714 of 7173
Quote:
Originally Posted by DJZeratul View Post
for data security, raise the patrol read and consistency check to say, 40% and drop the others by 5%, respectively. This will ensure it is checking your data for consistency more often and correct errors if necessary.
Where do I make these adjustments?
    
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post #2715 of 7173
Quote:
Originally Posted by ShadowFox19 View Post
Wow, thanks for sharing your settings!
How would you suggest setting mine up if I want everything very secure?
For higher data reliability, the first thing you should do on the 6i is use RAID6. You will lose some performance but probably not noticably in the real world. In my opinion running RAID5 with 8 1TB+ drives is asking for trouble, but obviously this is not an issue if you are properly backed-up and performance is more important (or if you have a PERC5!).

If you have a working BBU, other than running RAID6 there is not really that much you need to change, as the BBU protects anything in the cache in the event of a power loss or system crash. As DJ said, just up the patrol reads priority and you will (should!) be fine.
post #2716 of 7173
As a suggestion you can run a hot spare with the perc5 for an extra level of redundancy.
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post #2717 of 7173
Quote:
Originally Posted by the_beast View Post
I would re-check the cooling in your case. I can think of no real reason to need that many case fans - I would bet that at least some of those fans are working against each other. This can hurt your cooling performance, creating dead spots with very little airflow that can cause overheating problems despite very high overall case airflow.

Reseating the card in the x16 slot may have helped the situation as you have moved it out of such a dead spot. As most graphics cards have decent built-in fan-assisted cooling it is likely this card will not suffer in the same way. Have a careful look at exactly how and where the air flows around your case. You may be able to improve cooling dramatically by reversing some fans, adding some ducting or even removing fans. As a side benefit you may also be able to reduce noise.

If it is not an overheating problem then the only other thing I can think of is a motherboard problem. The PERC should not be able to tell whether it is running in an x8 or x16 slot, so if it works in one slot but not the other that would point to an issue with that slot. It is unlikely to be a BIOS issue (unless you have recently flashed) if the card used to work before in the x8 slot.

Hope this helps.
Argg.. same problem this morning. My D: disappeared. Haven't changed anything, it's also one of the coldest day of the week. I have no clue

When I boot, I see the card doing initiialisation, no problem, but once in windows, it's not even in the device manager. Or if it's there, few minutes after it disappear.
Edited by Vric - 6/29/09 at 7:14am
post #2718 of 7173
Quote:
Originally Posted by Vric View Post
Argg.. same problem this morning. My D: disappeared. Haven't changed anything, it's also one of the coldest day of the week. I have no clue

When I boot, I see the card doing initiialisation, no problem, but once in windows, it's not even in the device manager. Or if it's there, few minutes after it disappear.
How has the cooling been up to now? All I can think of is that the chip has been damaged by overheating somehow?

If it was a tuesday I would suggest a Windows Update might have caused it, but they're not due for another 10 days or so. No other suggestions, unless you have installed something or updated a program that might have broken a shared library or something.
post #2719 of 7173
Thread Starter 
Quote:
Originally Posted by Blinky7 View Post
Finally got my Perc5 and set it up with 6x640gb drives in raid5.

I am very much interested in what the options for capacity expansion are. It is important for me to know that beforehand so I can decide if I am going to start with these 6x640gb drives or go for something like 4x1tb.

So As soon as I hooked the drives up I went on to try some expansion scenarios. I created a raid5 array using only 5 out of 6 drives and only about 400gb from each drive instead of all the space.
Then I went on to the reconstruction utilities to see what options I had to expand.
Well, adding the 6th drive was there as expected...but I could not find any option to grow the array to use the rest of the space in those original 5 drives...
I was led to believe that this was possible....well, is it? is there some special way to do it?
The issue is with the file system, not the RAID controller. The default NTFS maximum partition size is 2TB. Just Google the limitation and you'll find ways around it.
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post #2720 of 7173
Quote:
Originally Posted by DuckieHo View Post
The issue is with the file system, not the RAID controller. The default NTFS maximum partition size is 2TB. Just Google the limitation and you'll find ways around it.

what does the 2tb limit have to do with anything I said?

I simply want to know if there is a way to expand an array not by adding an extra disk to it, but by replacing the existing with bigger ones.
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