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PERC 5/i RAID Card: Tips and Benchmarks - Page 25

post #241 of 7150
Alright, ordered a new card that should be here Monday....maybe Friday if I'm lucky. Also ordered 8 640GB drives to go along with it.

Won't actually get to use it for a while yet (probably) but I do intend to plug it into an old AMD-based system to get the firmware updated and whatnot so it's ready to go for its final destination.

However, I need cables that will be a good 30" (or more) long, the adapters I've seen seem to be considerably shorter than that. Anybody see anything that might help me out?

Edit:

http://www.wiredzone.com/itemdesc.asp?ic=32004967

This seems to be it, $20 doesn't seem all that bad I guess.
Edited by technodanvan - 9/23/08 at 9:06pm
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post #242 of 7150
So if I were to get a perc would it be worth it to get a battery back up unit and more ram. what type of ram do I get and how much would it cost.
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post #243 of 7150
I think someone said that it would be worth it to get the BBU, so that you can enable Write-Back cache without worrying about your data becoming corrupted.

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post #244 of 7150
what about ram?
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post #245 of 7150
Quote:
Originally Posted by reLm View Post
what about ram?
If you enable write-back cache, yes.
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post #246 of 7150
what does write-back cache do and if i were going to enable it what ram do i get or do i just use the 256 thats comes with it?
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post #247 of 7150
Quote:
Originally Posted by reLm View Post
what does write-back cache do and if i were going to enable it what ram do i get or do i just use the 256 thats comes with it?
When writing to your hard drive, the data goes:

CPU->RAM->RAID Card Cache->RAID Card Processor->Hard Drive

So when you write a file to the hard drive, you normally have to wait for the entire thing to get written to disk. And if you want to read it later on, it has to be re-read from the drive.

What write back cache does is it makes your CPU think that the data only has to reach the RAID Card Cache. Once it reaches it, it remains there until the cache fills up, at which point the RAID Processor will write anything that needs to be written to the drive.

This does two things:

1) If you want to write a file to your disk that is smaller than the Cache size, it appears to happen almost instantly. This is because it only actually gets written to the cache before the CPU gets the "all done" signal, while in reality the RAID Processor does the work in the background afterwards without the rest of the computer knowing the difference. The larger the Cache, the larger the files can be.

2) If you want to re-read data that you recently wrote (which happens frequently with paging files for example), it only has to be read from the Cache instead of the drive, speeding up access tremendously. The larger the Cache, the less disk accesses that need to be made.



If you want to upgrade the RAM, you'd need a 512MB DDR2-533 Unbuffered/Unregistered ECC stick.
Edited by Manyak - 9/23/08 at 11:50pm
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post #248 of 7150
Hi All,

Can the Write-Back cache be enabeled without the battery at all? I really need it enabeled

I am getting the card just to benchmark it and then just to stick it into my ESXi test box, that isnt too utilized or important.

Im trying to prove to "senior" consultants in my company that HP servers we are getting are "junky" since they dont have hardware raid cards (not even as an option) and on the other hand Dells do have them with PECR 5 and 6 now
Edited by millyons - 9/24/08 at 5:15am
post #249 of 7150
Quote:
Originally Posted by Manyak View Post
If you want to upgrade the RAM, you'd need a 512MB DDR2-533 Unbuffered/Unregistered ECC stick.
Assuming I got the right stuff it was only a $12 upgrade, pretty affordable and probably more than worth it.

http://www.wiredzone.com/itemdesc.asp?ic=30684471

Doesn't say 'unregistered' but I thought all ECC was unregistered?
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post #250 of 7150
Thread Starter 
Quote:
Originally Posted by millyons View Post
Hi All,

Can the Write-Back cache be enabeled without the battery at all? I really need it enabeled

I am getting the card just to benchmark it and then just to stick it into my ESXi test box, that isnt too utilized or important.

Im trying to prove to "senior" consultants in my company that HP servers we are getting are "junky" since they dont have hardware raid cards (not even as an option) and on the other hand Dells do have them with PECR 5 and 6 now

Yes. You may need to flash the card to a newer BIOS. Write-Back can definitely be enabled without the BBU. I am doing it right now.


How many HDs and what RAID type are you running in those HP servers?
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