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Best way to raid 5

post #1 of 13
Thread Starter 
I'm finishing up my home server build and decided I like the idea of a 3 drive Raid 5. I plan on using 3 x Samsung F4's linky. My mobo doesn't support raid 5 (Only 1, 0, and 10). Also, I still haven't decided if I'm going to run Amahi or something like free NAS, or maybe even WHS. I don't see a point in shelling out the $ for a PERC5 card, and I'm trying to keep the build as inexpensive as possible. Are any of the PCI cards worth it? Am I better off trying to figure out how to run software raid in something like Amahi?


~S
post #2 of 13
I'd get an extra drive and go for RAID 10, it performs much better in general.
    
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post #3 of 13
Linux software RAID is good. Another nice thing about it, in case your hardware fails, you can just move your hard drives to a new build with Linux and your RAID-5 array will work. If you go with hardware RAID, if your RAID card fails, you'd need to buy a RAID card from same manufacturer to get it working.
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post #4 of 13
Thread Starter 
Quote:
Originally Posted by citruspers View Post
I'd get an extra drive and go for RAID 10, it performs much better in general.

I thought about it, but that's another $75.00 I will have to convince the wife I ~need~ to spend. Is using the onboard raid controller for RAID 10 limiting in any way? It will be mostly used for music and backup up the computers in the house, might store the occasional movie, but not sure about that yet.


~S
post #5 of 13
Thread Starter 
Quote:
Originally Posted by rui-no-onna View Post
Linux software RAID is good. Another nice thing about it, in case your hardware fails, you can just move your hard drives to a new build with Linux and your RAID-5 array will work. If you go with hardware RAID, if your RAID card fails, you'd need to buy a RAID card from same manufacturer to get it working.
I never knew that. I think Amahi supports raid as it uses linux as a base. I'm a complete noob when it comes to Linux, this will be my first machine running something other than a windows based OS.


~S
post #6 of 13
Linux software raid (also called fakeraid or MDraid) is pretty good indeed.
As far as raid 5 vs raid 10: I found my array to write at 18 MB/s in RAID 0, and 5 MB/S in RAID 5 (old drives). Quite the difference, eh?
    
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post #7 of 13
Quote:
Originally Posted by citruspers View Post
Linux software raid (also called fakeraid or MDraid) is pretty good indeed.
As far as raid 5 vs raid 10: I found my array to write at 18 MB/s in RAID 0, and 5 MB/S in RAID 5 (old drives). Quite the difference, eh?
fakeraid and software RAID are not the same.

How many drives were you using? If it was only 3 then the difference is not surprising, although unless those drives were over 10 years old you should have had better speeds than that and you will have had somethign set up incorrectly.

OP - I would go for Amahi and use GreyHole - it's the Amahi Home Server version of folder duplication in WHS. Means you can use your 3 drives and still have redundancy to protect your data against drive failure. And when you need more space you can just add more drives - no messing about with RAID at all.
post #8 of 13
The downfall i have seen with software raid is mainly centered around the ability to manage and repair in case of a disaster scenario. When going with software raid I hope the OP reads up on all commands (i.e. mdadm) in order to be ready to rebuild a disk if it goes down/knows linux; not as straightforward as hardware raid IMHO.
    
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post #9 of 13
Depends on the environment. For most Linux servers, unless you insist on using the command line, something like Webmin is really very useful for managing many parts of the Linux environment. It is also extensible via modules. Managing RAID and storage devices is very easy with it.

Of course Webmin would be most useful in a "plain" environment like Ubuntu Server. For a home server environment, Amahi + Greyhole, or perhaps FlexRAID might be more useful. Amahi will support RAID, but there's no GUI for it yet. You could however install Webmin on top of Amahi, and configure RAID with that.
Edited by parityboy - 3/13/11 at 1:59pm
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post #10 of 13
Thread Starter 
I think I will go the Amahi + Greygole route first and see how it goes.


Thanks for the help/advice all.

~S
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