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PERC 5/i RAID Card: Tips and Benchmarks - Page 314

post #3131 of 7150
Quote:
Originally Posted by binormalkilla View Post
Well guys I'm still loving the PERC card. I'm wondering something though....is it possible to expand a RAID 5 array by adding another blank hard drive? I would like to expand my array soon...
Yeah, it's possible on both the PERC 5/i & PERC 6/i
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post #3132 of 7150
Quote:
Originally Posted by Tator Tot View Post
Yeah, it's possible on both the PERC 5/i & PERC 6/i
That's what I thought...I was looking around LSI's website and documentation and I haven't found how to yet.
Can this be done in the BIOS or in the MegaRAID software? I haven't found it in either yet.....
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post #3133 of 7150
Quote:
Originally Posted by binormalkilla View Post
That's what I thought...I was looking around LSI's website and documentation and I haven't found how to yet.
Can this be done in the BIOS or in the MegaRAID software? I haven't found it in either yet.....
I know how to do it on the PERC 6/i but I'm not quiet sure on the 5/i.

I think someone had a guide in this thread, it'd be worth the 10 seconds to search RAID expansion in the thread tools.

I'm also looking it up, I'll probably post up again if I find it.

But for now, I'm gonna grab some Zzz's, I'll look tomorrow though.
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post #3134 of 7150
Quote:
Originally Posted by binormalkilla View Post
Well guys I'm still loving the PERC card. I'm wondering something though....is it possible to expand a RAID 5 array by adding another blank hard drive? I would like to expand my array soon....
Operations -> Advanced Operations -> Reconstruction Wizard
post #3135 of 7150
I currently have a Perc 5/i with LSI firmware, 2 Velociraptors 300GB in Raid0 and 3 Seagate 1.5tb in Raid5.

I am thinking of upgrading to 4 ST936751SS (36gb SAS drives) in Raid0. This is since I saw a post on this thread where a member had this set up and was getting around 400 mbs read and write max.

My question is, will I notice the difference? Is it worth the upgrade? I am only thinking of it since the price is low for these drives at the moment.

I also have a concern that the 3 x 1.5tb Raid5 drives will have issues since they are SataII an not SAS. Does mixing them hurt that much ? I read that they cannot talk or transfer at the same time.. Is that something I will notice?

What got this all started really was the raid0 intel ssd benchmarks I saw in this theard where a user got around 1000 mbs. However I read that the trim commands do not work when the drives are in raid. That being said the drives performance would degrade over time, so i wouldn’t want to deal with that hassle. I know I would also need to upgrade to a Perc 6/i if i went this route due to the bandwidth bottle neck on the perc 5/i, so that adds a further cost.
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post #3136 of 7150
Honestly, I doubt you will notice the difference outside of benchmarks. If you were using 7200rpm disks that were a generation or more old then I'd say go for it, but I don't think the step up from V-Raps will not be noticeable in day to day usage.

As for SAS/SATA - you can use the different disks on the controller without issue. You just cannot use a mixture of the 2 interfaces in a single array. I would be mroe concerned as to whether your Seagate drives (presumably 7200.11s) are going to have issues all of their own...
post #3137 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.
XP x86 (32-bit) doesn't support GPT. XP x64 (64-bit) does support GPT.
post #3138 of 7150
Quote:
Originally Posted by Diakatarnis View Post
hmmm so some of the tests are saying its lots better (the crystal one) but the rest are really close :S

im confused :'(
The gains are on the two benchmarks that you would expect to show gains. CrystalDiskMark uses a 100MB data chunk, and HD Tune's File Benchmark uses a 64MB file length. Both easily fit within the 512MB cache on the card, but apparently didn't with the 256MB cache so you see huge gains in write speed with both benchmarks.

Basically if your use of the drive is mostly files that can fit inside the 512MB cache, but not the 256MB cache you'll get a good boost from upgrading. If your use is either small files, or very large files you likely won't see much improvement.

Now having said all that... Considering the price of a 512MB module on ebay there doesn't seem like a lot of reason to not upgrade even if it doesn't improve performance much.
post #3139 of 7150
Does anyone know what the best settings would be (stripe size, etc) for 3x300GB VelociRaptor's in RAID 5?

Also, I have a 1TB drive I hooked up to the Perc card that isn't being recognized as a Virtual Drive.. if I create a Virtual Drive, will it erase the data that's on the drive?

I have a Perc 6/i card.
post #3140 of 7150
Here's are the early results from my RAID-5 setup.

Gear:
  • 6x Samsung Spinpoint F2EG HD154UI 1.5TB 5400 RPM 32MB cache
  • Dell Perc 5/i PCI-E x8 SAS RAID controller with 256MB cache & battery with latest LSI firmware.
  • 2x 32pin SAS to 4 SATA cables
  • Gigabyte GA-EP45-UD3P rev 1.0 motherboard
  • Intel E5200 CPU
  • Windows XP x64 SP2

The array is a single RAID-5 volume with a 512k stripe. The Perc 5i is in the 2nd PCI-E x16 slot (farthest from the processor). It required taping the SMbus pins to boot.

Benchmarks

ATTO:


HD Tune Read:


HD Tune Write:


Thoughts?
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