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Use seperate controllers vs same controller??

Forum Storage : General Storage - Use seperate controllers vs same controller??

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shaba230   03-01-2007 at 12:23:37 AM

I posted this in the Asus motherboard forum but I think it's probably better suited here:

I just want to know if I have one HD i use for my OS and another HD i use for storage/recording tv from my tuner card, is there a benefit from putting them on seperate controllers (primary on my intel controller, storage on my jmicron contoller)?

I know they are obviously on separate channels even if they are on the same controller but I dont really know if a controller gets 'bogged down' when it's trying to do two things at once and that's what i'm trying to avoid.

I want to be able to do tasks that involve only my primary (OS) hard disk while my tuner is recording shows to my storage HD without interruption and with maxiumum performance.

Thanks in advance!

P.S. If it helps my MB is a ASUS P5W DH Deluxe, HD1-74 gig raptor (SataI), HD2-320 gig seagate SATAII.

thx!

(oh by the way from what i've done thus far, having it on seperate controllers, i'm getting about 40-50 MB/s sustained transfer rates from the raptor to the storage drive, dont know if that helps any??)

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choirbass   03-07-2007 at 05:50:17 AM
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im assuming one sata controller is a pci card, and the other is onboard... 33MHz pci is limited to 127MB/s max... the onboard controller im assuming supports sata300, which is limited to 300MB/s max

unless either hdd is being pushed to the full 127MB/s transfer rates, seperately or combined, having both hdds on the pci controller card simultaneously wont hurt performance any... the most youre getting right now between them is 50MB/s, so youre more than safe

you also have the issue of other pci devices using some of that shared bandwidth too, however many other pci devices you have have installed also

either way though, at only 50MB/s, you can support another 77MB/s max before theres really any need to deal with changing controllers

Reply to choirbass
shaba230   03-08-2007 at 11:29:36 AM
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they're both onboard...so i'm not sure how that would affect your answer.

Reply to shaba230
choirbass   03-08-2007 at 05:02:23 PM
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even if theyre both onboard, it really shouldnt matter... if theyre both over sata300 for instance, each individual connected device is allowed up to 300MB/s then, each... same with sata150... your main limitation however when transferring between hdds, is the speed of your 320GB seagate (sata im assuming, and not pata, it wont matter much either way though), this is assuming also that youre using the newer 74GB 16MB ADFD raptor, and not the older 74GB 8MB GD version... heres a comparison between the seagate 750GB 7200.10, and the raptor 74GB ADFD (the 750GB and your 320GB should offer similar performance)

http://www23.tomshardware.com/stor [...] 6&chart=34

you can choose any of the benchmarks, and find the difference between the 2 hdds

if you are using the older raptor, just change the drive being compared, same with comparing any other hdd

Reply to choirbass
shaba230   03-12-2007 at 10:37:21 PM
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Quote :

even if theyre both onboard, it really shouldnt matter... if theyre both over sata300 for instance, each individual connected device is allowed up to 300MB/s then, each... same with sata150... your main limitation however when transferring between hdds, is the speed of your 320GB seagate (sata im assuming, and not pata, it wont matter much either way though), this is assuming also that youre using the newer 74GB 16MB ADFD raptor, and not the older 74GB 8MB GD version... heres a comparison between the seagate 750GB 7200.10, and the raptor 74GB ADFD (the 750GB and your 320GB should offer similar performance)

http://www23.tomshardware.com/stor [...] 6&chart=34

you can choose any of the benchmarks, and find the difference between the 2 hdds

if you are using the older raptor, just change the drive being compared, same with comparing any other hdd



okay so you're telling me having them on the same controller doesn't affect performance? Nothing one of these HD's will do will "tie" up the controller resulting in slower data rates on the other channel of the same controller?

Thanks!

Reply to shaba230
choirbass   03-12-2007 at 10:48:03 PM
- 0 +

yep. as long as youre not using the 33MHz PCI bus for data transfer (and just using the onboard sata controllers instead), you should have no hope of being bottlenecked by current hdds.

being as how theyre on an onboard sata controller, they dont share bandwidth between one another then (theyre each on their own channel as well)... each hdd is capable of transferring up to 150MB/s, or 300MB/s individually, depending on the sata interface supported too

in this case, i would even move them both to the same onboard controller, seeing if that actually improves performance at all (try switching between both controllers, to see which offers better performance)

Reply to choirbass
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