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PERC 5/i RAID Card: Tips and Benchmarks - Page 481

post #4801 of 7194
Quote:
Originally Posted by the_beast View Post
hadn't realised it was an array - what are you HDTune settings? You need to have the block size larger than (number of drives) x (stripe size) or you won't test the max sequential speeds.
Default settings for hdtune.

I'm testing a single drive, but it is the same for a 2*300gb 15k.7 raid1 array.

Strip size is 128kb and block size is larger....

Firmware is lsi latest for 8408e.

post #4802 of 7194
Quote:
Originally Posted by il_menne View Post
Read policy: always read ahead
Disk cache policy: enabled
strip size: 128kb
I would change to adaptive read ahead to see if that setting is causing a conflict with the bench - it may be your (effectively) that your controller is forcing your disks to read sequentially (blocks ABCDEFGHIJ), but HDTune is asking for blocks AB then EF then IJ (hopefully you get the idea... )

Secondly, I'm assuming you have a BBU for your PERC. If not get one - you can't justify the cost of running 2 15K.7s and not spend $20 on the battery. Then turn on write-back caching for the array, and turn off the disk caches.

I do have to ask though - why the SAS drives and not SSD?


Quote:
Originally Posted by ehaze View Post
only cover the top of the pins and not the back?
Yes - the pins on the 'back' are different pins.
post #4803 of 7194
Quote:
Originally Posted by the_beast View Post
I would change to adaptive read ahead to see if that setting is causing a conflict with the bench - it may be your (effectively) that your controller is forcing your disks to read sequentially (blocks ABCDEFGHIJ), but HDTune is asking for blocks AB then EF then IJ (hopefully you get the idea... )

Secondly, I'm assuming you have a BBU for your PERC. If not get one - you can't justify the cost of running 2 15K.7s and not spend $20 on the battery. Then turn on write-back caching for the array, and turn off the disk caches.

I do have to ask though - why the SAS drives and not SSD?
I'll try adaptive read-ahead.

I have a BBU installed, write back caching is enabled and disk cache is disabled.....

Why sas drives? I've bought 15k.7 drives as used at a very good price....
post #4804 of 7194
Wooo! My 3x Samsung 2TB's came in today and I am getting them setup with my PERC 6/i! I'll be in and out with questions as I run across them! (even though I've readmost of it in anticipation!)

- Any idea how long will it take to initialize RAID 5 on the three drives?

edit: DOH! The MegaRAID software is nice enough to tell me 4hrs, 20mins, and 8sec.
Edited by spartacus - 11/29/10 at 5:51pm
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The Byte Mogul
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post #4805 of 7194
perc 5/i with battery and did the SMBus pin mod.

trying to install the card on a Asus P6T mobo with no luck.
when the mobo boots up, i see the windows logo, then a blue screen flashes for a fraction of a second. then the mobo reboots, over and over.

tried un-checking the boxes in the perc bios.

any ideas?
post #4806 of 7194
Quote:
Originally Posted by BLinux View Post
TBH, I don't think any of this additional cooling is necessary unless you have a really really hot box. IMHO, this is all just waste of money, but it is yours to waste I suppose... I think drilling holes in the PCI bracket to allow the hot air over the card to exit would be more useful and cheaper method of keeping the card cool.
It's hardly a waste of money when all of these parts were salvaged from old parts. The black heatsink w heatpipe was from my sig rig's motherboard, and the BGA RAMsinks were left over from when I had my 2900XT watercooled.

No need to worry about me, I've been doing this for some time
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PWNzershreck
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post #4807 of 7194
Hey fellow raiders...
What would be an appropriate stripe size for raid 5 with 3x 2tb drives that are going to store a lot of 4gb videos and music & picture data I have write back & read ahead enabled, and didn't get good benchmarks at all with a 64k stripe size (roughly single drive speeds).
Oops! I forgot to turn up HDTune's block size for the benching, and didn't realize I was bottlenecked when copying from 1 drive to my RAID.

Happiness lies in the attached images.


Thanks.


Edited by spartacus - 11/30/10 at 4:13pm
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post #4808 of 7194
...
will samsung F4EG 2T hdds work with the perc 5?
they are 4K and not 512b
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post #4809 of 7194
Hello everyone. At work we decommissioned a bunch of servers after virualizing them. So, I took home a Dell Poweredge 1950 and a Perc 5/i RAID card for my PC. Free is always nice.

Before asking my question, here is what I have done so far: I manually enabled SLI in the BIOS (card is in 2nd x16 slot and did not POST when set to non-SLI). I flashed it with the latest LSI firmware but the card now has an error complaining about the config (maybe a re-flash is in order). The flash was done while booted in XP 32bit. Some times the card does not POST after a soft reboot. A larger heat sink has been installed.

The card functions and has a RAID 5 with 3x250GB SATA attached. I can read and write to the volume in XP no problem. Disks have been fully initialized

The problem I have run into is during the installation of Windows 7 x64 Ent. With the original Dell firmware, I had to load the drivers. With the LSI firmware, it sees it but I can also load the drivers if I want to. In all of these situations, I can create a new partition and format it but I cannot install Win 7 to it. The installer says that the disk is not suitable to install Windows on. It does the same for a single 250GB disk on my nvidia RAID (haha) controller.
Edit: The same issue exists if I try to install Server 2008 x64 R2 Ent.
If this has already been discussed in one of the 5000 posts, please let me know which one.

System:
Asus A8N-SLI Premium
AMD Athlon x64 x2 4800+ WC
GeForce 8800 GTS WC
4GB PC3200
Perc 5/i
Edited by eatont9999 - 12/5/10 at 10:05am
post #4810 of 7194
Been running a perc5i for two years, 4 x 1,5TB.

Decided to add 4 x 2TB (Samsung) to create a second array. Drives are detected at 1TB only..?



Anyone have an idea? Firmware is Dell 5.2.2.0072.

Edit: Well it appears there was something wrong with the HDD themselves. I had to low level format them and they finally appeared at 2TB. Weird.
Edited by roche - 12/9/10 at 10:01am
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