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Non-enterprise HDDs and RAID

post #1 of 11
Thread Starter 
I recently read someone saying on another forum that enterprise drives aren't needed when running software RAID ie. no card.

Is this true? I assumed there was no difference between hardware and software RAID in the respect that you run a higher risk of your drives being dropped occasionally when running non enterprise drives because of their lack of TLER, CCTL, or ERC, depending on the drive manufacturer.
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post #2 of 11
Hard drive manufactures will also not give support if there is a failure or the drive does not work correctly due to running a non RAID drive in RAID - that being said, I've never had any issues running my WD Caviar Blacks in Raid-0
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post #3 of 11
Thread Starter 
Quote:
Originally Posted by appleg33k85 View Post
Hard drive manufactures will also not give support if there is a failure or the drive does not work correctly due to running a non RAID drive in RAID - that being said, I've never had any issues running my WD Caviar Blacks in Raid-0
Well I run RAID1, but the drives are just a mirror image of each other and can be run independently after a failure. I always assumed there was no real trace left over since there was no striping or parity data written.

Anyone else know more about traces of running in a RAID being left behind from RAID1?

Also, anyone have anything firm about the non enterprise drives in software RAID?
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post #4 of 11
I'm using MDADM to manage the following drives in a RAID 5 linux array:

2x WD Black 750 GB
2x Samsung Spinpoint F1 750 GB
2x Hitachi 1 TB (whatever the cheap one is on newegg).

No issues with reliability or performance (knock on desk).
Quote:
beers@fs:~$ sudo hdparm -tT /dev/md0

/dev/md0:
Timing cached reads: 1804 MB in 2.00 seconds = 901.99 MB/sec
Timing buffered disk reads: 982 MB in 3.00 seconds = 327.25 MB/sec
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post #5 of 11
Thread Starter 
Quote:
Originally Posted by beers View Post
I'm using MDADM to manage the following drives in a RAID 5 linux array:

2x WD Black 750 GB
2x Samsung Spinpoint F1 750 GB
2x Hitachi 1 TB (whatever the cheap one is on newegg).

No issues with reliability or performance (knock on desk).
That F1 is enterprise, but the other four aren't.

Thanks.
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post #6 of 11
Quote:
Originally Posted by Kaldari View Post
That F1 is enterprise, but the other four aren't.

Thanks.
That F1 is a consumer-grade drive, just like all the others.

The F1R is the Samsung RAID-specific drive.
post #7 of 11
Thread Starter 
Quote:
Originally Posted by the_beast View Post
That F1 is a consumer-grade drive, just like all the others.

The F1R is the Samsung RAID-specific drive.
Ah, I thought all F1s were RAID drives.
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post #8 of 11
i am using to western digital black 500Gb drives in mobo raid 0 no issues at all so i wouldn't say you need enterprises drives.
    
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post #9 of 11
Thread Starter 
Yeah, I know you are capable of RAIDing them, I was just wanting someone knowledgeable that could explain why it is that you don't need TLER, or similar things on other brands, when running software RAID. Why is there a difference between hardware and software RAID as far as that goes, assuming that's true?
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post #10 of 11
It's a half-truth. Hardware raid controllers usually have a pretty limited configuration window for command response timeout (like, 2-20 seconds), while software raid is generally more flexible. Hardware raid controllers sometimes fail to process pending commands to the entire raid volume while a command is pending for a single disk, which means that the entire system will lock up and probably crash during the disk's EC cycle. Software raid, if properly written, should hopefully never do this, unless the disks are in a simple raid 0. In that case, the software raid will probably return an unreadable file error, which could cause the system to crash anyway.

Limited-duration error recovery cycles still help guarantee smooth functioning of a software raid and will prevent spurious disk dropouts. I don't think any reasonable person would suggest that you should use disks with long error recovery cycles or aggressive internal spin-down times in a software raid.

However, you don't need enterprise disks - any disk known to have a relatively short error recovery timeout (ie, Hitachi/Samsung) will do.
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