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PERC 5/i RAID Card: Tips and Benchmarks - Page 382

post #3811 of 7150
Sounds good about not getting the lp/green drives. Im looking at samsung 1tb f3, but i cant seem to find them instock anywhere. Hopefully this is just a short term thing.
post #3812 of 7150
Quote:
Originally Posted by GregOP83 View Post
I read that in the review of the PERC 5/i. First off, is that realistic? If I am creating a 2.32TB RAID 5 array with 5 drives and a PERC 6/i with fast init, shouldn't it be mostly instant?

Otherwise it was a well thought out and good review. Glad someone took the time to do it. GJ
Thanks for reading it!

Quote:
Originally Posted by Tator Tot View Post
RAID 5 should never take "days" to complete... that's just...

I had a PERC 5/i with a RAID 5 array on it, I literally went to set up the array, grabbed 2 hot pockets, came back and it was done.

Even the older PERC 4 cards I have in my PE2800 don't take that long to set up an array on.
The RAID array really did take that long to finish initializing. Even if I canceled the background initialization and did a "Quick Initialization", it started over in about 5 minutes. It was quite annoying! My guess is because I created and managed the virtual drive through the Dell OpenManage software, there is a safety mechanism (or bug) in place where it just starts over. No idea. Even after removing the failed drive (see below) and creating a new RAID 5 array (7 drives in RAID 5 with a hotspare), it wouldn't take the "Quick Initialize" and kept starting the "Background Initialize" again. I now have quite a bit of experience with the card, but I can't, for the life of me, figure out how to skip that. Canceling and Quick Init don't do squat.

I would like to give thanks to the original poster of this thread. I've read every last post before purchasing it many months ago.

I'd also like to thank Seagate for making a terrible 7200.10 line of drives. Without them, I wouldn't have had a failed OS drive and the time to benchmark the controller.
Edited by thideras - 1/6/10 at 10:21am
post #3813 of 7150
The 'Quick' option basically just puts off the initialisation until later. The full initialisation HAS to be performed, and if you select the quick option it is done in the background so you can start to use the array.

There is no way around it, and it is by design. The array will not (or should not) take days to initialise, but every time you use the array it will slow down the process (and the array performance will also suffer during the init too).
post #3814 of 7150
Quote:
Originally Posted by the_beast View Post
The 'Quick' option basically just puts off the initialisation until later. The full initialisation HAS to be performed, and if you select the quick option it is done in the background so you can start to use the array.

There is no way around it, and it is by design. The array will not (or should not) take days to initialise, but every time you use the array it will slow down the process (and the array performance will also suffer during the init too).
The only ones that took days were the RAID 10/50. RAID 5 was extremely quick (a few hours). I'm not sure why 10/50 were substantially slower, but the card was warm in the server case and working hard.

Good to know on the "Quick" option, thank you.
Edited by thideras - 1/6/10 at 10:45am
post #3815 of 7150
Quote:
Originally Posted by thideras View Post
The only ones that took days were the RAID 10/50. RAID 5 was extremely quick (a few hours). I'm not sure why 10/50 were substantially slower, but the card was warm in the server case and working hard.

Good to know on the "Quick" option, thank you.
Ah that makes more sense. My RAID 5 took about 2hours 30min to complete. Of course I also had a bad controller. Would it help to bring background init priority from 30% up to say, 90%? I mean, I imagine that only helps if the drive is doing other things, if you let it idle during BGI it should use 100% anyway. Right?

Either way, 30% seems silly to me. I'd rather get the damned task out of the way. And what the hell is a patrol read? I need to read up on that. Seems to me 30% is way to low for all the background tasks that go on with the controller.

Answered my own question:
Quote:
Today’s RAID
systems need a proactive tool—such as the Background
Patrol Read feature of Dell PERCs—to help avert such data
problems by fixing the bad sectors when all of the drive
array members are online and redundant.
As nice as BGI sounds, I think I'd want it to be very low priority, ie instead of 30% make it around 5%... Or even off. I'd rather run it once a week and it use 100% priority then run 24/7 and low priority.
Edited by GregOP83 - 1/6/10 at 11:45am
post #3816 of 7150
BGI is a one-off initialisation - you want it to run once, but not interfere with operation so you can start to use the array right away. It will run at 100% until you try and use the array, then will use a maximum of 30% of cpu cycles when you do. 30% is a sensible number, and ensures the init moves forward but still gives useable array speed.

Patrol reads should do done constantly - again so the array is always useable. Think of it kind of like those virus scanners linked to screen savers or folding@home apps - the array is just checked when you don't want to use it for anything else.

For most uses the default priorities are the ones to stick with, and ensure maximum data integrity without affecting useability.
post #3817 of 7150
Just added a second card to my system. I'm not sure if anyone has tried it (368 pages is a looooong thread to go through), but I can confirm that two cards work together in the same system. It gives a prompt when you enter the RAID cards configuration asking which card you would like to configure. I was very nervous that two would not play nice in the same system since I hadn't seen anyone try it yet.

http://thideras.com/images/projects/..._installed.JPG
post #3818 of 7150
How long does the BBU take to charge ?
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post #3819 of 7150
Thread Starter 
Interesting bug on the 780i motherboard.


On the PERC 6/i, I cannot enter the card BIOS while on a NF200 PCIe 2.0 lane. It locks up at initializing the device. The BIOS is accessible on the 780i southbridge's PCIe 1.1 though. That said, the arrays still work on either PCIe controller.

Another thing to note is that the NF200 bottlenecks small file writes in ATTO by as much as 50%.
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post #3820 of 7150
I think I just bricked my perc 5/i

I just got it yesterday and it was working well with the default Dell firmware. I decided to upgrade to the latest LSI firmware but that wasn't a good idea probably.

The firmware update itself completed succesfully (at least no errors) but after rebooting I don't see the configuration screen and windows does not recognize the device anymore.

I tried booting into dos and perform a downgrade but unfortunatly this also doesnt work. It just hangs and only shows the dos4gw screen.

EDIT:

Strange thing; As a final resort I switched the card from one PCI-E slot to another and guess what? It worked again. Then I switched back to the original slot and.... Yes it worked also.. Strange, but I'm a happy!
Edited by j3roen - 1/8/10 at 4:26am
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