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PERC 5/i RAID Card: Tips and Benchmarks - Page 395

post #3941 of 7150
I think i don't have the correct settings on my Perc5i for my Raid-0. Performance is worse than the onboard AMD SB750 controller. The array is on 2 Vertex 30GB SSD's, latest firmware 1.5, sanitary erased,1024K aligned and Win7 x64 installed.
I used Adaptive read ahead, Write Back Cache, Unchanged Disk Cache, 64K stripe size and Direct I/O.

Max Writes is ok (~330MB/s) but Reads top at 280MB/s while at SB750 topped at 425MB/s (ATTO v2.45 bench). Small size reads are also very low, and at large sizes (2048K->8192K) there is some inconsistency. I benched with ATTO v2.45 for 256MB,512MB,1GB test file and i also tested CrystalDiskMark 3.0Beta2 and AS-SSD latest version. Reads are low for every bench-app...

My Perc5i has 256MB cache, latest Dell FW 5.2.2.0072 and 4.5.0.64 (22/9/2009) drivers from DELL automatically installed by Win 7.

I'll post later result ss from benches.
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post #3942 of 7150
Hey everyone, just wanted to post an update. I've been waiting on some new PERC 6/i's to come in from borito so I can get a PERC that can charge. He sent me another confirmed working BBU/cable and same thing, won't charge it.

I got the new 640GB RMA replacement for the drive that had 7000 errors. I now hold a steady 403MB/s read speed using HD tune, with a max near 500MB and a burst in the 900 range. Not a single spike either, minimum was around 300MB/s. I'm happy.

If I buy another WD640GB drive, is it very simple to expand the size of my RAID5 from what it is now to properly encompass the new drive and get the performance increase (albeit small) from adding said drive? =D I'd assume yes, considering what PERC....stands for.
post #3943 of 7150
My system is coming together. I got the Perc 5/i installed last night. I decided to swap the video card for an nVidia 9500 GT because it doesn't need a PCI-E power connector, which was all-but colliding with one of the HDDs with my X1950. Crisis averted.

Photos tonight, when I have my rack and rails.
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post #3944 of 7150
Quote:
Originally Posted by GregOP83 View Post
Hey everyone, just wanted to post an update. I've been waiting on some new PERC 6/i's to come in from borito so I can get a PERC that can charge. He sent me another confirmed working BBU/cable and same thing, won't charge it.

I got the new 640GB RMA replacement for the drive that had 7000 errors. I now hold a steady 403MB/s read speed using HD tune, with a max near 500MB and a burst in the 900 range. Not a single spike either, minimum was around 300MB/s. I'm happy.

If I buy another WD640GB drive, is it very simple to expand the size of my RAID5 from what it is now to properly encompass the new drive and get the performance increase (albeit small) from adding said drive? =D I'd assume yes, considering what PERC....stands for.
Yeah, you can expand the array. It only works one disk at a time. After each expansion, the array has to rebuild. This will be done in the background using the BGI subsystem, like we posted about a few pages back.

Also, keep in mind: any disks added to / removed from the array will be based on the smallest disk that was originally part of the array. So if you add a 1TB drive, it will remain at 640GB until you build a new array, even if you replace every 640GB with 1TB.
    
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post #3945 of 7150
Thread Starter 
MSM is reporting a SMART error on one of my 7200.10 in RAID0.

I want to use the Reconstruction Wizard to convert my 3xRAID0 to 2xRAID0 so I can RMA the drive. However, all my options are grayed out. Why?


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post #3946 of 7150
BTW Guys i have a TON of these in stock now, i should have over 18 tmorrow.

BTW what sas>sata cables do i need? im finnaly using one of these for myself
    
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post #3947 of 7150
Quote:
Originally Posted by LuciferX View Post
Anyone knows if Perc 6 works with this chipset?: NVIDIA MCP61S(GeForce 6100/nForce 405)

I have a biostar mother with a free pcie and the onboard video

BIOSTAR SPECS
Tested, WORKS!!!, pin tape mod is not requiered
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post #3948 of 7150
Quote:
Originally Posted by DuckieHo View Post
MSM is reporting a SMART error on one of my 7200.10 in RAID0.

I want to use the Reconstruction Wizard to convert my 3xRAID0 to 2xRAID0 so I can RMA the drive. However, all my options are grayed out. Why?

I don't think the PERCs allow you to shrink an array in this way. I may be wrong, but I think the remove option only allows you to go from eg a 3-disk RAID5 to a 2-disk RAID0 (ie no capacity reduction). I haven't read anything that suggests you can shrink an array.

Would be handy if you post back if you find a way to do it though...
post #3949 of 7150
Quote:
Originally Posted by DJZeratul View Post
Yeah, you can expand the array. It only works one disk at a time. After each expansion, the array has to rebuild. This will be done in the background using the BGI subsystem, like we posted about a few pages back.

Also, keep in mind: any disks added to / removed from the array will be based on the smallest disk that was originally part of the array. So if you add a 1TB drive, it will remain at 640GB until you build a new array, even if you replace every 640GB with 1TB.
I thought that, according to a Dell document I had (I don't think it was the manual, but a PERC 5/i hints and tips usage pdf), that it was possible to expand an array once all the disks had been replaced.

I'm not at home on my own machine at the moment, but when I am I will try and dig out the file and post the procedure (can't really test it though as I only have 6/is).
post #3950 of 7150
It's RAID0, remember? Backup anything you think is important, replace the drive, and start over.
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