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PERC 5/i RAID Card: Tips and Benchmarks - Page 340

post #3391 of 7176
Quote:
Originally Posted by DJZeratul View Post
No, RAID-1 isn't designed to stripe data. The only way to make this possible would be to set a "stripe size" (in quotes since it isn't being striped) that matched the block size that the volume is formatted with, and that is variable based on which filesystem you are using, so there wouldn't be an easy way for the card to make this assumption.
Are you sure? Your answer sounds more theoretical than based on actual testing.

Theoretically RAID-1 can gain STR when reading because the same data is on two drives and it can read half of the data from each drive. However, very few RAID cards do this, but it is definitely possible and has been implemented by some RAID cards. Seeing that the Perc cards are fairly high end cards, I thought they might do this.
post #3392 of 7176
Quote:
Originally Posted by Stereodude View Post
Are you sure? Your answer sounds more theoretical than based on actual testing.

Theoretically RAID-1 can gain STR when reading because the same data is on two drives and it can read half of the data from each drive. However, very few RAID cards do this, but it is definitely possible and has been implemented by some RAID cards. Seeing that the Perc cards are fairly high end cards, I thought they might do this.
Are you talking about Linux's software RAID ability to stripe-read on a mirrored set?

or perhaps "RAID 1.5"... which is a proprietary RAID by HighPoint... RAID 1.5 performs data striping and mirroring simultaneously using only two hard drives. When reading, the data is read from both disks simultaneously and most of the work is done in hardware instead of the driver.

I'm not sure if the Linux PERC drivers support this or not... but I know in windows it is not supported on the PERCs
    
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post #3393 of 7176
http://www.lambda-tek.com/components...prodID=B214209

That the right sort of cables for the card? I finally got my card out of customs and the cable the came with it only supports 2 drives
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post #3394 of 7176
Quote:
Originally Posted by Starbuck5000 View Post
http://www.lambda-tek.com/components...prodID=B214209

That the right sort of cables for the card? I finally got my card out of customs and the cable the came with it only supports 2 drives
The picture is correct. But read below it.
Image accuracy is not guaranteed.
Please do not rely on the image for your purchase


The description is for a 3m CAT5e patch cable. Also, you will be looking at a much higher price. Something cheap would be about $15 for 1 set.
 
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post #3395 of 7176
:S didn't rtfd Cat5 is ethernet

http://www.4allclients.co.uk/?action...m_source=GB_UK

they look to be right however. Picture and discription match
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post #3396 of 7176
Quote:
Originally Posted by Starbuck5000 View Post
:S didn't rtfd Cat5 is ethernet

http://www.4allclients.co.uk/?action...m_source=GB_UK

they look to be right however. Picture and discription match
Those seem to be right. The only thing you need to look out for is 'Crossover'. A Crossover will not work, it must be Straight-Thru to work.

These are the ones I bought. They work good.
Adaptec .5m - http://www.adaptecstore.com/additem.asp?sku=3422326
Adaptec 1m - http://www.adaptecstore.com/additem.asp?sku=3422327

The ones you linked look correct however.
 
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post #3397 of 7176
Quote:
Originally Posted by Bonzâ„¢ View Post
Those seem to be right. The only thing you need to look out for is 'Crossover'. A Crossover will not work, it must be Straight-Thru to work.

These are the ones I bought. They work good.
Adaptec .5m - http://www.adaptecstore.com/additem.asp?sku=3422326
Adaptec 1m - http://www.adaptecstore.com/additem.asp?sku=3422327

The ones you linked look correct however.
Cheers

+rep for the help as well
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post #3398 of 7176
When doing large data transfers, or even writing to the array, I'll notice that performance is great in the beginning, then drops down to 25MB/s. For example, I was writing a truecrypt volume to the drive, it began at 120MB/s, about 5% into it, it dropped to 25MB/s and remained at 25MB/s until completed.

It's a 3 disk Raid-5, 3 x 1.5TB, did the long initialization when setup.

Not sure what the issue is, perhaps someone has a suggestion?
post #3399 of 7176
Thread Starter 
Quote:
Originally Posted by neonblingbling View Post
For what ever reason, it seems that both my mobos just do not like it when the only PCIe 16x slot is used for a non-video card. I just made it fit in a 1x slot and it works fine (minus the bottleneck...).
The x16 slot is probably a PEG slot... PCIe slot for video cards only.

Quote:
Originally Posted by dhahlen View Post
When doing large data transfers, or even writing to the array, I'll notice that performance is great in the beginning, then drops down to 25MB/s. For example, I was writing a truecrypt volume to the drive, it began at 120MB/s, about 5% into it, it dropped to 25MB/s and remained at 25MB/s until completed.

It's a 3 disk Raid-5, 3 x 1.5TB, did the long initialization when setup.

Not sure what the issue is, perhaps someone has a suggestion?
120MB/s for a few seconds? It could be filling the cache first.


It sounds like your write-back isn't enabled?
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post #3400 of 7176
Quote:
Originally Posted by DuckieHo View Post

120MB/s for a few seconds? It could be filling the cache first.


It sounds like your write-back isn't enabled?
Can write-back be enabled on the fly via the bios?

Also, I understand that raid-5 write speeds will be slow due to parity, but I should at least see 50-60MB.

Also, write-back disabled in bios. I am not running a UPS on the file server, but I have the perc 5i battery hooked up. Basically, if i have a power failure, I'm screwed.

Thoughts on running write-back without a UPS on the server, but a battery on the controller?

UPS will be added soon though....
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