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PERC 5/i RAID Card: Tips and Benchmarks - Page 306

post #3051 of 7150
I managed to flash the xxx17 firmware with the DOS megaCLI (what a pita)


now,
it still shows as a PERC at startup. is this normal?

also, now i cant get into the CTRL-R configuration. the system just locks up after the BBU error message!!! any ideas??
post #3052 of 7150
Quote:
Originally Posted by xpeh78 View Post
WS 2003 works like a charm as well. You'll need a GPT partition, which XP doesn't support.
ahhh gpt, that's the name i was looking for.
post #3053 of 7150
whats the difference between the dell firmware and the LSI MegaRAID firmware?
post #3054 of 7150
Quote:
Originally Posted by {core2duo}werd View Post
ahhh gpt, that's the name i was looking for.
yeah i got it now thanks guys

for my raid 5 5x 1tb hdds what size should i select 1mb or the small ones?

thanks again
post #3055 of 7150
First things first... Fantastic card and a fantastic thread!

I ran into a problem compiling new kernel for my NASbox. I'm running PERC5/i raid5 on a VIA epia SN1800 mini-itx board with Ubuntu linux 9.04.

Everything pretty much works straight out of box, especially the PERC and whole raid thing, so thats good...

But in order to have better power saving control, for example cpu throttle control, i needed to compile a new kernel (2.6.30.5) using This guys config for basis.

But unfortunately the new kernel does not recognize the PERC controller. Tried older kernel again, and it works just fine. Tried allso to compile new one with all the LSI RAID modules/options enabled, but it just is'nt working

Anyone have any tips or ideas how to make PERC5/i controller work with self compiled kernel?
post #3056 of 7150
1- How do i test my perc memory? besides taking it out from the perc and putting it on my system. 2- Also is the battery worth it? why do i need it?

3- Im going to be using 2 15k 26gb in raid 0 for OS, which settings should i use to set this raid?
4- also im going to be using raid 5 on 3 500GB hds, which settings should i use in this raid??
5- Is it worth it upgrading the memory from 256MB to 512MB??

Thanks


PST: this is for my main computer, so im looking for speed
Edited by supermiguel - 8/17/09 at 7:54pm
post #3057 of 7150
Quote:
Originally Posted by supermiguel View Post
1- How do i test my perc memory? besides taking it out from the perc and putting it on my system.
You can't really - your system will almost certainly not POST with the PERC memory. Very few desktop systems support registered RAM.

Quote:
Originally Posted by supermiguel View Post
2- Also is the battery worth it? why do i need it?
The battery prevents possible array problems to to unexpected shutdowns if running in write-back mode.

In write-back mode, any changes are written to the RAM on the PERC, and the PERC signals the OS to continue as soon as these changes have been stored in the cache (ie very quickly). At this point the cache holds your data, but it is not on the disks. The PERC then writes the data out to the drives, which may take a few seconds. If your computer shuts down unexpectedly during this time (BSOD, power outage) the data on the disks will be corrupted & the array will fail. The battery prevents this - it will hold any unwritten data in the memory even if the server reboots, then write it out to the disks when the disks are running properly again.

You can avoid this problem by running in write-through mode, but this is much slower as the PERC will keep the OS waiting until all writes have been committed to disk. You can also use a UPS in place of the BBU (Battery Back-Up), but this only protects against power outage, and if you get a BSOD or other software/driver error your array may become corrupted.

Quote:
Originally Posted by supermiguel View Post
3- Im going to be using 2 15k 26gb in raid 0 for OS, which settings should i use to set this raid?
RAID0, 32-64KB stripe, write-back.

Quote:
Originally Posted by supermiguel View Post
4- also im going to be using raid 5 on 3 500GB hds, which settings should i use in this raid??
RAID5, 128KB stripe, write-back (only if you have a BBU).

The best read-ahead settings will probably depend on your usage - you might have to play around for a while to set them. Note that benchmarks won't be very helpful with setting these - you will probably have to use the computer for a while and see how it feels, or time how long it takes to complete a few disk-intensive tasks.

Quote:
Originally Posted by supermiguel View Post
5- Is it worth it upgrading the memory from 256MB to 512MB??
Not really IMO. If your 256MB DIMM is faulty replace it with a 512MB DIMM. Otherwise the difference is likely to be minimal.

Also be very careful of the DIMM you buy - the PERC cards are VERY picky about the memory they will accept.
post #3058 of 7150
i asked this in my thread, but I figured this would be a better place to ask for posterity. What motherboards do the perc6 cards work with?
Guardian
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k ASRock z68 Extreme 4 Integrated for now 16GB 
Hard DriveOSPowerCase
160GB Intel G2+2x1.5TB Hitachi Desktar 7200RPM Ubuntu+Win7 Seasonic 380W Corsair 600t 
Mouse
G5 
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Guardian
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 2600k ASRock z68 Extreme 4 Integrated for now 16GB 
Hard DriveOSPowerCase
160GB Intel G2+2x1.5TB Hitachi Desktar 7200RPM Ubuntu+Win7 Seasonic 380W Corsair 600t 
Mouse
G5 
  hide details  
Reply
post #3059 of 7150
Q: for a raid 5 of 5 1tb hdds what would be the best stripe size for dvd movies...if any one has done the leg work?

Q: i came across 4 intel x25-m 80gb's for about $40 what would be the best raid 0 strip size for the os?

thanks
post #3060 of 7150
Quote:
Originally Posted by BillDavis View Post
Q: for a raid 5 of 5 1tb hdds what would be the best stripe size for dvd movies...if any one has done the leg work?
The largest available. Although TBH it won't make much real-world difference above 128KB or so (and I think you need LSI firmware to do that anyway).

Quote:
Originally Posted by BillDavis View Post
Q: i came across 4 intel x25-m 80gb's for about $40 what would be the best raid 0 strip size for the os?

thanks
Where? Put me down for a couple...
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