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RAID 5 Help


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#1 pcmaddeanp

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Posted 11 December 2008 - 03:37 AM

Hi,

I am going to build a PC and I will use this PC for video editing and more.
I want to protect my data by using RAID 5, but I don't know how many disks need to be used.
I have a WD 500Gb Green Power Hard Drive, for my media (HD Podcasts, Images), Video editing data.
1. I don't have enough space for all this data.
2. I want to protect this data.
3. I want to use RAID 5.
4. How many hard drives do I need?
5. Can I use all the same make and product code and size?
6. If I use 3 500Gb Hard drives, how much Gbs do I get (In RAID 5)
7. If I use 4 500Gb Hard drives, how much Gbs do I get (In RAID 5)

Thanks

pcmaddeanp

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#2 SLIX

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Posted 11 December 2008 - 05:00 AM

Hi

I think this will answer all your questions.

http://en.wikipedia.org/wiki/Standard_RAID_levels#RAID_5
Steve

#3 pcmaddeanp

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Posted 11 December 2008 - 05:15 AM

Thanks for the link.

So would you recommend using RAID 5 with 4 disks?

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#4 SLIX

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Posted 11 December 2008 - 05:31 AM

If you really want RAID 5 then yes. Buy 4 branded reliable drives all of the same size/model.
However, you say you want to protect your data. RAID 5 will not prevent you from accidently deleting files. If you really want to protect them then make backups using an external hard drive.
Steve

#5 pcmaddeanp

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Posted 11 December 2008 - 05:44 AM

Lets say that one of my 4 500Gb drives fails in RAID 5.
How long would it take to 'rebuild' the RAID array?

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#6 SLIX

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Posted 11 December 2008 - 06:02 AM

How long would it take to 'rebuild' the RAID array?


This is hard to answer. Its like saying "How long is a piece of string?"
Does RAID-5 take a long time to rebuild? Short answer: YES. Long answer: It depends on how large the RAID-5 slice is, how many disks it is striped across, the I/O speed of the disks involved, the CPU speed of the system(s) involved, how much other work is underway and lots of other factors. Poorly configured RAID-5 slices can take days to rebuild.

Sorry I can't be more specific.

Why RAID 5 anyway? Why not go for RAID 1.
The performance of RAID 1 is better than RAID 5 and its setup is simpler.

Edited by SLIX, 11 December 2008 - 06:21 AM.

Steve

#7 pcmaddeanp

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Posted 11 December 2008 - 08:17 AM

The performance of RAID 1 is better than RAID 5 and its setup is simpler.


Why is the performance of RAID 1 better? How is it better?

Could I use 2 500Gb Hard Drives in RAID 1, then get 2 250Gb HDs for Video editing Data in RAID 0?

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#8 pcmaddeanp

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Posted 11 December 2008 - 10:21 AM

Looking online about RAID 1 and RAID 5, I found these quotes:

RAID 1

You can already see that there's no speed benefit here on account of the absence of striping.

write performance can often be slower than what you'd get with just one simple hard drive not being mirrored at all


RAID 5

Some controllers are optimized for this kind of performance, and actually perform better in a RAID 5 configuration than in a RAID 0 config


How many Gbs will I get with 3 500Gb HDs?

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#9 pcmaddeanp

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Posted 11 December 2008 - 01:27 PM

Right,
I'm going to go for RAID 5 (because of fast data access and data retention). I am going to use 4 500Gb Hard Drives (4 WD 500Gb Green Power SATA HDs)

Thanks for your help.

pcmaddeanp

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