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Is onboard RAID 5 bad?

post #1 of 9
Thread Starter 
I need more storage and I'm considering trying out RAID5 with 3x 3TB WD Red drives on my Z77 board (Sig PC).

..But I've read RAID 5 is very slow without a dedicated controller (especially write speed)?
The RAID is entirely for storage of movies/music etc.

What do you think? I'm not interested in buying a RAID controller btw. It's gonna be too expensive. So is RAID1 with 2x 4TB. Not much more space than my current 3TB.. redface.gif
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post #2 of 9
Quote:
Originally Posted by Lass3 View Post

I need more storage and I'm considering trying out RAID5 with 3x 3TB WD Red drives on my Z77 board (Sig PC).

..But I've read RAID 5 is very slow without a dedicated controller (especially write speed)?
The RAID is entirely for storage of movies/music etc.

What do you think? I'm not interested in buying a RAID controller btw. It's gonna be too expensive. So is RAID1 with 2x 4TB. Not much more space than my current 3TB.. redface.gif

A dedicated RAID card would be better in every situation, not just speed.

You do realise you can get a Dell PERC6i for around $50. Its a very popular server grade RAID card. As is the older PERC5i.

As for the performance of your onboard controller. Try it out and see if you are happy?
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post #3 of 9
Thread Starter 
I don't have the hdds yet, I was mainly looking for user experience with onboard raid5 on z77 smile.gif
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post #4 of 9
Onboard Parity RAID is something I've never seen end well. The PERC5/i and 6/i, or betterb ut a bit moreeexpensive LSI SAS9260 series, would be your best choice.

Also, I have to say that I simply cannot recommend RAID5 anymore. The chance of an URE during rebuild is too great, due to the rebuild time + total capacity with 3TB drives, that it is hardly a means of protection. RAID6 has a few more years left, but you would need 4 drives or it'd just be slower RAID1 and with four drives, RAID10 is faster while offering equal or better protection. Thus you can see that Parity RAID is on its way out.
   
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post #5 of 9
Thread Starter 
Quote:
Originally Posted by nleksan View Post

Onboard Parity RAID is something I've never seen end well. The PERC5/i and 6/i, or betterb ut a bit moreeexpensive LSI SAS9260 series, would be your best choice.

Also, I have to say that I simply cannot recommend RAID5 anymore. The chance of an URE during rebuild is too great, due to the rebuild time + total capacity with 3TB drives, that it is hardly a means of protection. RAID6 has a few more years left, but you would need 4 drives or it'd just be slower RAID1 and with four drives, RAID10 is faster while offering equal or better protection. Thus you can see that Parity RAID is on its way out.

I guess you're right.. But whats the best option for a home server then? No RAID at all? tongue.gif How is software raid? On a machine with FreeNAS fx?
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post #6 of 9
UnRAID seems like a popular choice ATM.
Check out Murlocke's 117TB UnRAID servers thread
http://www.overclock.net/t/1282253/my-unraid-servers-117tb-total/0_100
post #7 of 9
Quote:
Originally Posted by Lass3 
I guess you're right.. But whats the best option for a home server then? No RAID at all? tongue.gif How is software raid? On a machine with FreeNAS fx?
software RAID has similar limitations to fakeraid (the onboard one) - RAID0, RAID1 and even RAID10 should work well and without significant performance decrease in comparison to hardware RAID, while RAID5 and RAID6 will certainly not.
RIAD10 offers better protecition and performance than RAID5 or RAID6 and does not necessarily require a dedicated controller, but at a cost of lower capacity-efficiency.
if capacity-efficiency is not your priority, you do not want to buy controller and you want best performance and data safety, then software RAID10 is the best solution.

onboard RAID5 (and RAID6) is bad, if you want it you should buy at least PERC 5 or PERC 6
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post #8 of 9
you cant use drives larger than 2TB on a PERC 5 or 6.
post #9 of 9
Quote:
Originally Posted by Sean Webster View Post

you cant use drives larger than 2TB on a PERC 5 or 6.
true. i have not noticed that 3tb drives were mentioned. do not buy it if you already have these drives.
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