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PERC 5/i RAID Card: Tips and Benchmarks - Page 360

post #3591 of 7150
Quote:
Originally Posted by kur1j View Post
Anyone have any performance benchmarks with the PERC 5/i and comparable drives to the 1TB Samsung F1s on freeBSD?

dd if=/dev/zero of=ddfile2 bs=8K count=500000 (creates 4GB file in current directory)
I am getting about 150-160MB/s Write

dd if=ddfile2 of=/dev/null bs=8k
200MB/sec Read

I saw the front page of a guy getting 300MB/s plus but that was on windows using HDTune and I am not sure that is really comparable.
If you see the links in my sig, those are benchmarks (iozone) in Linux using 500GB Western Digital RE3 drives. Not FreeBSD, but at least it is Linux.
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post #3592 of 7150
hey guys,

i've had a lot of troubles with my card.

specs are 8 WD 6400AAKS's
PERC5I with 512 reg ecc.

Asus P5w64ws

in atachement is the log,does anyone has any ideas?
post #3593 of 7150
Quote:
Originally Posted by BLinux View Post
If you see the links in my sig, those are benchmarks (iozone) in Linux using 500GB Western Digital RE3 drives. Not FreeBSD, but at least it is Linux.
Holy cow thats a LOT better than what I am getting. I tested it with iozone and got nothing even close to what you got. I got values < 200MB/sec. Roughly the same as what I posted before with my dd tests.

I saw that you changed some setting but I don't see them anywhere in my PERC's RAID configuration (Hitting CTRL-R when it boots up). Am I missing something?
post #3594 of 7150
Quote:
Originally Posted by kur1j View Post
Holy cow thats a LOT better than what I am getting. I tested it with iozone and got nothing even close to what you got. I got values < 200MB/sec. Roughly the same as what I posted before with my dd tests.

I saw that you changed some setting but I don't see them anywhere in my PERC's RAID configuration (Hitting CTRL-R when it boots up). Am I missing something?
You'll notice in my benchmark post that I said I was getting 100-200MB/sec in sequential reads initially. In Linux, it turns out that turning off the read-ahead caching in the controller and tuning the OS (Linux 2.6.x kernel) block device read-ahead cache up to 32MB made a *huge* difference. Basically, the read-ahead in the controller and in the OS was probably stepping on each other's toes.

That aside, I don't know why you don't have the RAID controller settings. When you setup a virtual disk, you have to select those settings; stripe size, read-ahead, write cache, etc...

Also, I don't know your physical configuration, but I'm using 8x HDD in RAID5 which are all 7200RPM SATA drives.
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post #3595 of 7150
I am using 3x 1TB Samsung F1's in RAID 5. They are all 7200RPM drives. I know that the more drives you add to RAID 5 it does see some benefit but I'm not even seeing close to what that guy got on the front page of this thread with only 4.
post #3596 of 7150
Quote:
Originally Posted by kur1j View Post
I am using 3x 1TB Samsung F1's in RAID 5. They are all 7200RPM drives. I know that the more drives you add to RAID 5 it does see some benefit but I'm not even seeing close to what that guy got on the front page of this thread with only 4.
3x HDD in RAID5 means 2x HDD theoretical max throughput. If each drive can do 80MB/sec, then your theoretical max is 160MB/sec. In the real world, it would be somewhat less with proper tuning. I don't know what kind of numbers you're expecting, but the number of spindles is the most important factor in RAID performance...
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Dual Quad-core L5430 2.66Ghz 12mb cache Intel 5000 chipset ATI ES1000 64GB FBDIMM DDR2 PC2-5300 667Mhz 
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Dual Quad-core L5430 2.66Ghz 12mb cache Intel 5000 chipset ATI ES1000 64GB FBDIMM DDR2 PC2-5300 667Mhz 
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post #3597 of 7150
Quote:
Originally Posted by BLinux View Post
3x HDD in RAID5 means 2x HDD theoretical max throughput. If each drive can do 80MB/sec, then your theoretical max is 160MB/sec. In the real world, it would be somewhat less with proper tuning. I don't know what kind of numbers you're expecting, but the number of spindles is the most important factor in RAID performance...
Ahhhh okay that makes sense. I was expecting 250ishMB/s as a single F1 does about 110MB/s-130MB/s a piece depending on where you read your review but that is theoretical so what I am getting is acceptable I guess.


Everyone says you can expand a RAID array (e.g. if you have 3 1TB drives and want to add another 1TB drive, you can without having to rebuild the whole array). But I haven't seen any option in the RAID menu to be able to add another drive.
post #3598 of 7150
Quote:
Originally Posted by kur1j View Post
Ahhhh okay that makes sense. I was expecting 250ishMB/s as a single F1 does about 110MB/s-130MB/s a piece depending on where you read your review but that is theoretical so what I am getting is acceptable I guess.


Everyone says you can expand a RAID array (e.g. if you have 3 1TB drives and want to add another 1TB drive, you can without having to rebuild the whole array). But I haven't seen any option in the RAID menu to be able to add another drive.
Just a heads up. RAID-5 is slow on the write-speeds. Read speeds isn't too bad, but any incarnation of RAID-5 on any controller is going to be slow... If you have 4+ drives, and aren't in a particular pressing need for "maximum space with a bit of parity", then going with RAID-10 will give you better write-performance over RAID-5.

As to expanding an existing RAID-5 array, check:
http://support.dell.com/support/topi...doclang=en&cs=

*should* apply to the PERC5 as well... I think.
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post #3599 of 7150
Yeah, long sustained writes on a RAID5 are going to be slower, but honestly, you're virtually never going to be doing that anyway. At least not at home. So don't worry about it.
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post #3600 of 7150
Quote:
Originally Posted by error10 View Post
Yeah, long sustained writes on a RAID5 are going to be slower, but honestly, you're virtually never going to be doing that anyway. At least not at home. So don't worry about it.
That's kind of a broad assumption, don't you think? Network copy of movie files? CD ISO files? Blue-Ray rips? HD movie files? Those are all big and long sustained file transfers to the HDD. And those will all take longer to copy over.

I personally happen to do a nightly transfer of a backup-to-disk image of my file server to an archive server. That's a 200GB single-file transfer every night.
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