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WD Green drives work well with raid?

post #1 of 12
Thread Starter 
Ok so I have read up a bit about RAID and WD Green drives, and they do work/dont work/might work confused.gif. I want to get 4 of these

http://www.newegg.com/Product/Product.aspx?Item=N82E16822136514

and put them in a RAID 5 array. Now I have read that because of them being 5400rpm drives, that they may not work and/or a workaround has to be used. This is where I got a bit confused. Does anyone here have WD Green drives in RAID and if so how is it working out for you?

I know that the WD RE drives (specifically 'Caviar Black RE4' drives) are made more specifically for RAID, but I don't feel i need those as I will mainly just be using this for storage (Music, Movies, TV, etc...)

first question on the board... drum.gif
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post #2 of 12
I've heard that they may or may not work in a higher level RAID like that. They work perfectly fine in a more simple RAID though, like my RAID1.
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post #3 of 12
I use the 6x 1TB version of them in RAID5 in my server. I have them divided though, 3x each since 3x are 64MB Cache and 3x are 32MB Cache. They work fine for me, and have not had any problems so far. Since my server is networked, I am more throttled by network limitations rather than drive speed limitations, as I get around 130MB peak and 110MB sustain, depending on file sizes.

Had I do it all over again, I probably would opt for something faster, just for internal copy speeds.
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post #4 of 12
Thread Starter 
Now RAID 0 is where its just all data and no 'backup', correct? With RAID 1 would it be 6GB as data space and 2GB for some backup, or is it half/half. This is where I was getting a bit confused when reading up about how much space is backup. I thought that only RAID 5 would be able to handle 4 or more disks?

It's funny I know a ton about PC's and putting it together, but I have never once messed with RAID, finally going to pop the cherry tongue.gif
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post #5 of 12
Thread Starter 
Yeah I would go for the Caviar Black, but this is just for my own PC. Plus 4 of these come out to ~$350, 4 Caviar Blacks come out to over $700.
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post #6 of 12
From what I've heard and read from quite reputable sources, these drive's do not work well in RAID's because they park their heads more often than standard drives do and as such the life is greatly reduced on these drives when using them in RAID's, I've heard reports of between 1 and 2 years of use in RAID before complete drive failure. I have seen people who put them in a RAID and within 6 months we're already reporting 50% of life or less in S.M.A.R.T. now I realize S.M.A.R.T. isn't always the most reliable thing but still that would be pretty concerning for me.

I personally bought 2 green drive a few months back and had serious performance issue's etc. I finally returned them and bought 2 Seagate Barracuda's to replace em and haven't looked back.
post #7 of 12
Will they work? Yes. Will it be fast? No. Although, if you're really worried about data loss/corruption I think RAID 1 would be a better choice.
Quote:
In the event of a system failure while there are active writes, the parity of a stripe may become inconsistent with the data. If this is not detected and repaired before a disk or block fails, data loss may ensue as incorrect parity will be used to reconstruct the missing block in that stripe. This potential vulnerability is sometimes known as the write hole. Battery-backed cache and similar techniques are commonly used to reduce the window of opportunity for this to occur. The same issue occurs for RAID-6.

Source.

EDIT:
Quote:
Originally Posted by g00s3y;12563825 
Now RAID 0 is where its just all data and no 'backup', correct? With RAID 1 would it be 6GB as data space and 2GB for some backup, or is it half/half. This is where I was getting a bit confused when reading up about how much space is backup. I thought that only RAID 5 would be able to handle 4 or more disks?

It's funny I know a ton about PC's and putting it together, but I have never once messed with RAID, finally going to pop the cherry tongue.gif

Raid 1 mirrors, so with four of those 2TB drives, you'd only have 4TB usable space. However, recovery would be easy, and complete. There's no reconstructing through calculations like there is with RAID 5.
Edited by BlackOmega - 2/28/11 at 8:41pm
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post #8 of 12
Thread Starter 
Quote:
Originally Posted by BlackOmega;12563889 
Will they work? Yes. Will it be fast? No. Although, if you're really worried about data loss/corruption I think RAID 1 would be a better choice.

Raid 1 mirrors, so with four of those 2TB drives, you'd only have 4TB usable space. However, recovery would be easy, and complete. There's no reconstructing through calculations like there is with RAID 5.

I am a bit worried based upon what I hear and read, but I have only had WD drives and all of them have been good, so I personally can't say anything bad about them. But I would be pretty pissed if I lost it all. Like I said its only storage, nothing I actually "run" will be on the drives. Only when I'm watching a movie, or playing/streaming music will it be in use pretty much. Would it be better off to just keep the 4 drives separate and not even put them in RAID? I just like the idea better of having everything of mine under 1 drive letter instead of 4 different ones.
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post #9 of 12
Quote:
Originally Posted by g00s3y;12564029 
I am a bit worried based upon what I hear and read, but I have only had WD drives and all of them have been good, so I personally can't say anything bad about them. But I would be pretty pissed if I lost it all. Like I said its only storage, nothing I actually "run" will be on the drives. Only when I'm watching a movie, or playing/streaming music will it be in use pretty much. Would it be better off to just keep the 4 drives separate and not even put them in RAID? I just like the idea better of having everything of mine under 1 drive letter instead of 4 different ones.

The question of whether to use a RAID array or not is: are you ok with the possibility of losing your data forever?

If there's data on there that you definitely don't want to lose then you'd be better off running in RAID 1. Granted you're paying double the money for half the space. But as I mentioned before, recovery from a drive failure is relatively painless with no possibility of data corruption.
So that is up to you whether or not you want to run it.

As for WD drives, I too have used them for years and have never had an issue. I have also used Seagate, no problems there either. The only drive I have ever had die on me was a Maxtor.
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post #10 of 12
The Western Digital Caviar Green drives are not advised to be used in hardware or firmware RAID. The issue is not over head parking as such (the drive will do that anyway) but instead it's the drives response time when asked to wake up - it can take too long, causing the RAID controller to drop the drive.

Additionally, this behaviour will be repeated if the drive hits a bad sector and goes into deep recovery mode, and since TLER cannot be set on these drives to avoid a 30 second deep recovery, they have every chance of dropping out of the array. Apparently, the latest generation of Caviar Black (FAEX/AAEX) are certified for "desktop RAID applications".
Edited by parityboy - 3/1/11 at 9:47am
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