wilkingj
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| posted on 7/3/11 at 12:03 PM |
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RAID 0+1 Array Advice needed
Team...
I am thinking of doing a Raid array for hi speed storage.
I am thinking of 6 x 500Gb drives, utilising 2 lots of 3 drives in Raid 0+1 ie striping and then mirrored.
Apart from some expensive solutions, anyone got any really good suggestions?
This will be for some hi throughput audio recording (possibly some video as well).
All thoughts gratefully recieved.
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scudderfish
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| posted on 7/3/11 at 12:15 PM |
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Don't know so much about the H/W side of it, but this is excellent S/W to run
http://freenas.org/doku.php
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scudderfish
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| posted on 7/3/11 at 12:51 PM |
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That is of course if you're working with a fast network. If it is locally attached storage, someone else can answer 
Don't forget backup as well. RAID just lets you accidentally delete your data twice.
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jossey
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| posted on 7/3/11 at 01:44 PM |
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if your going to run a raid array on a pc just use it for the booting and apps hard drive not the storage.
i have 2 raptors which are 67 GB each this turns my pc into a super booting machine.
If you use stripping on big hard drives its alot of space used up and very little difference unless your continually moving stuff from drive to
drive.
I have a
2.8 quad core Intel proc
4 GB Dual channel 8500 ram
asus motherboard
2 x 680 GHZ graphics cards on SLI.
i run 2 monitors + one projector when im dj'in and unless im copying stuff from a memory card to the main drive its never slowed down at all.
i have had files downloading. unzipping 5-10 different files, running web apps in background, copying to my NAS box and its still useable.
Hope this info is useful
Thanks
David Johnson
Building my tiger avon slowly but surely.
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v8kid
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| posted on 7/3/11 at 02:24 PM |
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"RAID just lets you accidentally delete your data twice."
You'd be surprised how quickly the sales people at B&Q try and assist you after ignoring you for the past 15 minutes when you try and start a
chainsaw
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karlak
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| posted on 7/3/11 at 02:35 PM |
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quote:
Originally posted by v8kid
"RAID just lets you accidentally delete your data twice."
Frightening isnt it .....
MK Indy - 2litre Duratec - Omex 600 - Jenvey throttle bodies - ETB DigiDash2
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auroan
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| posted on 7/3/11 at 04:37 PM |
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With that number of drives I'd be going Raid 5. You loose one disk's worth of storage not 3.
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karlak
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| posted on 7/3/11 at 06:58 PM |
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quote:
Originally posted by auroan
With that number of drives I'd be going Raid 5. You loose one disk's worth of storage not 3.
I think the point is he wants Hi-speed data transfer.
Raid 5 has a bigger overhead on performance. Raid 0/1 will give you much quicker access to and saving of data.
MK Indy - 2litre Duratec - Omex 600 - Jenvey throttle bodies - ETB DigiDash2
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britishtrident
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| posted on 7/3/11 at 07:05 PM |
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Hardware raid is good but it is tied to the exact hardware type --- if the controller goes down you could be in soapy bubble.
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scudderfish
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| posted on 7/3/11 at 07:20 PM |
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What bitrate must you sustain?
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auroan
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| posted on 7/3/11 at 08:43 PM |
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quote:
Originally posted by britishtrident
Hardware raid is good but it is tied to the exact hardware type --- if the controller goes down you could be in soapy bubble.
On a home setup you'll never see the speed difference. Unless he's running a real time transactional tuned Oracle database or something
of that ilk.
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karlak
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| posted on 7/3/11 at 08:53 PM |
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Had a chat with a mate of mine who knows this stuff - he has suggested taking a look at this link to work out what speed you want v's which
hardware. Like most things I guess you get what you pay for..
http://www.smallnetbuilder.com/component/option,com_nas/Itemid,190
MK Indy - 2litre Duratec - Omex 600 - Jenvey throttle bodies - ETB DigiDash2
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wilkingj
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| posted on 7/3/11 at 10:12 PM |
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Guys this is a bit more than a home NAS. It may have several audio streams to record all at once, and probably one or two Video streams.
Basically this it to monitor two TV channels, and several Audio channels as well.
All down to me doing daft things as a Radio Ham!
All the info is useful, as I dont have a lot of experience with Storage arrays.
That website is really useful, as it give me comparisons of kit etc.
Any more info would be greatly appreciated.
1. The point of a journey is not to arrive.
2. Never take life seriously. Nobody gets out alive anyway.
Best Regards
Geoff
http://www.v8viento.co.uk
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auroan
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| posted on 7/3/11 at 11:26 PM |
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For what you're doing (basically write throughput based) ; Unless your using a good top range hardware raid card going 0+1 will actually see a
performance degregation. What 99% of the cheaper / std controllers / software based solutions do when writing is write to one disk first, then the
second, then do a parity check between the disks to make sure the mirror'd data is correct.
So basically unless you have a system that does duel concurrent writes to both mirrors (v expensive) and single a parity check raid 0+1 is not the way
to go.
[Edited on 7/3/11 by auroan]
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britishtrident
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| posted on 11/3/11 at 07:46 PM |
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To paly around with RAID download FreeNAS and try it on any PC box
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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ChrisW
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| posted on 11/3/11 at 08:40 PM |
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I'd be using a bigger pair of drives in RAID 1 and using an SSD for caching if I were you.
Then again, for audio, even uncompressed 24bit audio isn't exactly a problem for a modern hard drive. How many channels are you expecting??
Chris
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