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PERC 5/i RAID Card: Tips and Benchmarks - Page 248

post #2471 of 7276
Thanks for the reply.

1) Unfortuantely no WD's here, these are Samsung's.
2) Yup, well aware. My partitions I am trying to set up is 200MB boot, 8GB /, 8GB SWAP and the rest is /home/.
3) I hope its not my RAM! I shut it down over night and the error is mysteriously gone... I still can not format though. I am trying another distro and disk, maybe bad installer?? I will find out, thanks!

-J
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post #2472 of 7276
Quote:
Originally Posted by dude051 View Post
Thanks for the reply.

1) Unfortuantely no WD's here, these are Samsung's.
2) Yup, well aware. My partitions I am trying to set up is 200MB boot, 8GB /, 8GB SWAP and the rest is /home/.
3) I hope its not my RAM! I shut it down over night and the error is mysteriously gone... I still can not format though. I am trying another distro and disk, maybe bad installer?? I will find out, thanks!

-J
Do you have any heatsinks on the ram or direct air blowing on the card? The memory maybe overheating.
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post #2473 of 7276
No RAM sinks, but I have a 120mm fan blowing directly across the card, its about 1-1 1/2 in from it. I can actually touch the heat sink, where as without the fan it actually burned my finger before. I too thought it was over heating.

My problem lies in the card seemingly resetting and then setting it self off line. The error message I was receiving was because the card overflows the cache and when I reboot the machine it is notifying me that it's not writing the cache back and it's lost, which is fine, and was due to the original problem. I get the following similar system errors when trying to partition:

megasas: FW now in Ready state
scsi 0:0:0:0: megasas: RESET -1 cmd=12
megasas: [ 0]waiting for 16 commands to complete
megasas: [ 5]waiting for 16 commands to complete
megasas: [10]waiting for 16 commands to complete

Message repeats until it gives up and goes offline:

megasas: [180]waiting for 16 commands to complete
megasas: cannot recover from previous reset failures
scsi 0:0:67:0: scsi: Device offlined - not ready after error recovery

Tracking this error down on google, some suggest it was firmware related, so I upgraded it from FW package 6.0.2-0002 to 6.2.0-0013 latest off Dell site. The problem still persist though. Thinking it might be Linux driver related, I booted up Windows Server 2008, downloaded the drivers from Dell and loaded them into the installer off USB. That hung when partitioning too and gave a "Failed to format the selected partition. [Error 0x80070057}" error.

Unfortunately, I can't even get an OS installed to check through any tools, but the BIOS for the card reports no errors with anything. The exception being the error I originally posted, but this is due to the dirty cache being purged after the issue happens in the first place.

I am at a loss, with the only thing I can think of next is to try in another PC. It might be a failed card...?

-J
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post #2474 of 7276
Hi All,
I have a PERC6i with 2x seagate SAS 146GB and 2x Fujitsu SAS 146GB.

I know its not common practice to RAID drives that are not identical however i want to give it a shot anyway.
However i am not sure what settings to use for RAID0

Block size 128k? this can go all the way up to 1MB
Read ahead?
Write back?
Cached IO?
Partition block size 64k?

The drives are going to be running as primary OS drive for Windows 7.
Appreciate your advice.
post #2475 of 7276
Quote:
Originally Posted by spasiba View Post
Hi All,
I have a PERC6i with 2x seagate SAS 146GB and 2x Fujitsu SAS 146GB.

I know its not common practice to RAID drives that are not identical however i want to give it a shot anyway.
However i am not sure what settings to use for RAID0

Block size 128k? this can go all the way up to 1MB
for system - like you have stated below - I think 16k should be ok - system have many small files - so you will have better performance with lover stripe (block) size ... unless you will have large files on same partition ?

Quote:
Originally Posted by spasiba View Post
Read ahead?
Write back?
Cached IO?
yes + yes (only if you have working battery or UPS) + yes

Quote:
Originally Posted by spasiba View Post
Partition block size 64k?
4x stripe size (16k) should be fine

Quote:
Originally Posted by spasiba View Post
The drives are going to be running as primary OS drive for Windows 7.
Appreciate your advice.
good luck

but I think you should consider RAID 5 - little bit slower but safer ...
post #2476 of 7276
Quote:
Originally Posted by spasiba View Post
Hi All,
I have a PERC6i with 2x seagate SAS 146GB and 2x Fujitsu SAS 146GB.

I know its not common practice to RAID drives that are not identical however i want to give it a shot anyway.
However i am not sure what settings to use for RAID0

Block size 128k? this can go all the way up to 1MB
Read ahead?
Write back?
Cached IO?
Partition block size 64k?

The drives are going to be running as primary OS drive for Windows 7.
Appreciate your advice.
stripe size:

for modern hard drives that are pretty fast, i wouldn't go with anything under 128k, even if you're doing a lot of random I/O. if you're doing a lot of sequential I/O, the larger the better, but in a project I worked on last year I found that 1M stripe actually slows things down. So, for heavy sequential I/O, 512K is the largest I would use.

read-ahead:

either read-ahead or adaptive read-ahead is ok. I use a lot of Linux, and Linux has it's own native read ahead caching which seems to step on the controller. so, in my case doing no-read-ahead gave me 10% better performance. but I don't know about windowz

write-back/write-thru:

in *most* cases, with a BBU, write-back is the better option. however, if you're going to be doing massive sequential writes that will easily exceed the cache of the controller, write-thru is faster. The reason is that once the cache gets full, and there's **** loads more data coming in, the controller stalls a bit trying to flush the cache in write back. in write thru, it's constantly flushing the cache to disk so there is less blocking.

cached I/O vs direct:

in the benchmarking i did, i couldn't find a difference in performance of sequential I/O with either setting. i wasn't testing random I/O so maybe it has a larger affect on that, but I don't know..??

partition block size:

if you have a lot of large files, the larger the better. but for small files, large block sizes waste a lot of space. the larger block size decreases the indexes so finding files/directories usually gets faster.

I don't know much about windows 7, so I write in somewhat general terms. To know for sure what your optimal settings are, I would try various combinations and run some benchmarks. I personally like to use iozone. (www.iozone.org)
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TAIPEI
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AURORA
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MotherboardGraphicsRAMHard Drive
ASRock X99 Extreme11 EVGA GTX 980 Superclocked 32GB 8x4GB Corsair LPX Samsung XP941  
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post #2477 of 7276
do i need to run any drivers to install win 7 on a raid with this card?
post #2478 of 7276
Just a quick question! I'm about to get delivery of my 6/iR card and am going to use it in my Windows 7 workstation. Should I use the default/dell/lsi drivers?

Is there a LSI firmware I can flash to? The controller is a LSISAS1068E. Is there any point since it isn't a PERC?

Thanks
post #2479 of 7276
Quote:
Originally Posted by BillDavis View Post
do i need to run any drivers to install win 7 on a raid with this card?
my PERC 5/i flashed to latest LSI firmware was recognized by W7 (beta) without any problems - no extra drivers required - or maybe auto-downloaded in background from internet I didn't noticed
post #2480 of 7276
Thanks for your replies guys, got it up and running getting great throughput will post screenie later.
Question:
I have a pair of 1TB disks RAID0 still attached on the ICH9R controller can i import this array under the PERC controller? i dont want to delete the data on it.
Do i just set them up with the same settings and not initialize them?
Thanks!!
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