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PERC 5/i RAID Card: Tips and Benchmarks - Page 279

post #2781 of 7150
Quote:
Originally Posted by OmegaNemesis28 View Post
$699.99 for this thing? no thanks
thats higher than even the retail... and you can get these things dirt cheap off ebay...
    
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post #2782 of 7150
Quote:
Originally Posted by OmegaNemesis28 View Post
$699.99 for this thing? no thanks
I got mine for $89 used with the battery. You DO NOT buy them new from Dell, that is a horrible idea.
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post #2783 of 7150
Quote:
Originally Posted by the_beast View Post
It is not quite as simple as this - you need to use a SAS expander, which is kind of like a network switch. It takes traffic from the controller on (usually) 1 or 4 ports, and spreads it out to a larger number of drives.

You can find expanders built in to some top of the range chassis (look at Supermicro and Chenbro, but there will be others). These are pretty expensive though. Chenbro make a few standalone expanders that connect to 4 of the ports on your PERC, and allow you to connect 16 or 24 drives (depending on the model) to those 4 ports. The 16 port model would therefore give connections for 20 drives (using the other 4-pot connector on the card) - a perfect number to match up to the cheap but decent Norco 20-bay chassis. The expanders cost in the region of $300, so coupled with a PERC they would be much cheaper than any of the high port count cards. You can even daisy chain expanders togther to add yet more drives - most high end cards can handle over 100.

One problem though - I have no idea on PERC compatibility. I would think the LSI-based PERC6 would fair better than the Intel-based PERC5, as the expanders use an LSI chipset, but this is by no means certain. Added to this, Chenbro have stopped selling their expanders in the short term becasue of compatibility problems with many controllers. As far as I know there is no ETA for the new firmware which they hope will improve the situation so they can start selling again. I hope they fix it soon though, as this is pencilled in as my next upgrade to work alongside my PERC6.
Follow up question, could I get a 2nd Perc5i and have them work together? Or would that just be forced to have the arrays be completely separate?

The only reason I ask is, getting another one of these cards for $90, even if the arrays must be separate, would do me much better than buying a $300 SAS expander.....
Edited by bruestle2 - 7/1/09 at 10:08pm
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post #2784 of 7150
Quote:
Originally Posted by DJZeratul View Post
thats higher than even the retail... and you can get these things dirt cheap off ebay...
i tried they arent there

EDIT:
stupid me, swapped 5/i
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post #2785 of 7150
$119.95
Is it even that worth it?
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post #2786 of 7150
Quote:
Originally Posted by OmegaNemesis28 View Post
$119.95
Is it even that worth it?
Getting a good RAID card that supports 4 drives for under $250 is difficult. This one supports 8. It is an amazing card. The only reason they are so cheap is because they were so common in Dell servers.
Edited by bruestle2 - 7/1/09 at 11:21pm
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post #2787 of 7150
Quote:
Originally Posted by BLinux View Post
It is possible to get close to the theoretical limit of the PERC 5/I (which is about 500MB/sec on RAID5 writes). My benchmarking on sequential I/O in Linux with XFS got over 420MB/sec sustained writes to a RAID5 using 7200RPM SATA drives (8x):

With SAS 15K drives, I would think you should be able to fair better, but I doubt you would exceed 500MB/sec on RAID5 writes.
Yep you are indeed right. That ATTO screenshot I posted shows ~450MB/s @ 2mb test size



@ Blinky7

I haven't confirmed this with the Perc5, but usually with SAS raid controllers, you cannot mix SAS and SATA drives on the same channel. The perc has 2 channels with 4 ports each. I'm pretty sure I read about it in the manual for the equivalent LSI card.
Edited by MetalPhreak - 7/1/09 at 11:30pm
post #2788 of 7150
Is it worth getting this card for a Raid 0 with 2x WD Cav Black 500gb? When on a AMD Gigabyte 790fx with SB600?

Or would it be more worth it getting a 3x Raid 0 going on it?
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post #2789 of 7150
Quote:
Originally Posted by samstaee View Post
Is it worth getting this card for a Raid 0 with 2x WD Cav Black 500gb? When on a AMD Gigabyte 790fx with SB600?

Or would it be more worth it getting a 3x Raid 0 going on it?
frankly, with RAID0 striping, I would just use software RAID0. Since you're not doing any parity calculations, you're not making use of the IOP333 processor at all. you might as well just get some cheap (but good quality) SATA controllers and do the RAID0 in software.

I don't know what OS you are running, but Linux, Solaris/OpenSolaris, and Windows servers should all support software striping RAID0.

The only time I really consider a RAID card is if I'm using RAID5/6 and sometimes RAID10 (just because it's easier to manage).
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post #2790 of 7150
Quote:
Originally Posted by BLinux View Post
frankly, with RAID0 striping, I would just use software RAID0. Since you're not doing any parity calculations, you're not making use of the IOP333 processor at all. you might as well just get some cheap (but good quality) SATA controllers and do the RAID0 in software.

I don't know what OS you are running, but Linux, Solaris/OpenSolaris, and Windows servers should all support software striping RAID0.

The only time I really consider a RAID card is if I'm using RAID5/6 and sometimes RAID10 (just because it's easier to manage).
Yes true, but I was under the impression that the SB600 SouthBridge when using sata hard drives would be slower that it should be.
I was hoping this would help, but if it was no different with 2/3 Raid 0 drives, then I guess I should stay with Onboard.
I using windows vista x64 and windows 7 dual boot btw
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