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What's wrong with RAID?

Admiral Fear
By Admiral Fear
in Storage Devices
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So, on the most recent WAN show, Linus said how people were getting mad at him for daring to use RAID. Thing is, a friend and I were going to be doing an overkill build in a couple months, and I was thinking to use 2 1TB SSDs in RAID 0 for all primary storage with a large HDD for secondary storage and backup in case one of the SSDs fail. Is this situation applicable to the reason RAID is bad for Linus' server? If it's not then why is RAID a bad idea for Linus' server? From what I know RAID 5 is a good middle ground between redundancy and capacity.

Thanks in advance.

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So, on the most recent WAN show, Linus said how people were getting mad at him for daring to use RAID. Thing is, a friend and I were going to be doing an overkill build in a couple months, and I was thinking to use 2 1TB SSDs in RAID 0 for all primary storage with a large HDD for secondary storage and backup in case one of the SSDs fail. Is this situation applicable to the reason RAID is bad for Linus' server? If it's not then why is RAID a bad idea for Linus' server? From what I know RAID 5 is a good middle ground between redundancy and capacity.

Thanks in advance.

I have my 840 EVO's in RAID 0 and they are more than fast..

PEWDIEPIE DONT CROSS THAT BRIDGE

 

 

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Raid is great but when you are in a business environment and data safety is paramount it is not because of possible corruption. If data on a drive goes corrupt in RAID 6 lets say then you replace a drive or add a drive, there is a chance that the corrupt data will be redistributed onto all drives as the RAID controller can not tell what information is the correct version. This really is notice able in RAID 1 and 10. For the average person RAID is not dead. But for business environments it is getting there. I only know of some small businesses that still use it and the government of Canada.

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It's bad if you're running a very large number of high-capacity hard drives, because then the risk of a drive failure goes way up, along with the time it will take for the array to rebuild. Eventually, with enough drives and high enough capacities, you run a serious risk of losing more drives while the array is still rebuilding, which means your redundancy is compromised.

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Raid is often confused with backups. People think their data is safe because they run "safe" raid. (not even considering Raid 0 here).

Raid is sometimes hazardous in it's own.

- Motherboard (when not using seperate raid card) dies ==> Bad Luck Joe: There goes your data even though you ran a serious raid (1-5-6-10)

- HDD dies. Let's rebuild shall we? ==> **20 hours later** Rebuilding process : 10%.

That time I saved Linus' WiFi pass from appearing on YouTube: 

A sudden Linus re-appears : http://linustechtips.com/main/topic/390793-important-dailymotion-account-still-active/

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RAID isn't bad, it depends on what you use it for. RAID 0 has no redundancy and it's just for speed. RAID 1 and up has redundancy, but only on the hardware level not software. Seriously if a person has just started out into the tech field, it would make them look really stupid by saying RAID is bad just to make themseleves look cool or pretend they know what they're talking about.

 

 

 

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In large arrays, you increase the failure rate exponentially. A raid array of 2 drives is no problem. A raid array of 24 drives is a HUGE issue, especially if they're HDDs which will mean when one drive fails, it'll take a while to rebuild it, and in that window when you're rebuilding a drive if a second drive fails, you're FUCKED and you lose EVERYTHING in the array. Then they went to arrays where 2 failures are acceptable, but it still takes WAY too long to rebuilt a failed drive in a large array which means that a second fails, and then while you're rebuilding that one a third is likely to fail, and so on. HDD's failure rates increase with age (whereas SSDs increase with amount of data written). With SSDs it's better since the time to rebuild a failed drive is very low so that complete failure window is short, but large arrays of HDDs is just asking for a shitload of important data loss.

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To sum up: RAID is better when used with a smaller number of drives with lower capacity. Get into the higher numbers and you are risking data loss because of the time to rebuild an array. Same with doing RAID with an alongside backup. If it takes longer to do the backup, larger window for failure.

PC Noise Hater Level = Linus

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Probably because Logan said RAID is bad on one of the Tek shows. Bunch of sheeple.

As much as I like the Tek, Logan really should learn to study up on the subject he wants to discuss if he doesn't really know what he's on about. It's not the first time he said stuff that is either an incomplete statement or just flat-out retarded.

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So, on the most recent WAN show, Linus said how people were getting mad at him for daring to use RAID. Thing is, a friend and I were going to be doing an overkill build in a couple months, and I was thinking to use 2 1TB SSDs in RAID 0 for all primary storage with a large HDD for secondary storage and backup in case one of the SSDs fail. Is this situation applicable to the reason RAID is bad for Linus' server? If it's not then why is RAID a bad idea for Linus' server? From what I know RAID 5 is a good middle ground between redundancy and capacity.

Thanks in advance.

 

 

Hey Admiral Fear,
 
RAID has its applications and is great for some things and terrible for other. Different RAID types offer different advantages and bring different risks. Some RAID types offer some level of redundancy and some speed boost. Others offer better redundancy with less speed. Some offer a great deal of both but use too much space for the redundancy part and are pretty drive-hungry. It all depends on what you are looking for and how big of a speed you need and risk you are willing to take.
The speed boost of RAID0, for example, makes more sense when used with HDDs as SSDs are already fast enough for most of consumer-level applications, games and everyday work and doubling it would make little difference compared to doubling the speed of a regular HDD.
 
Captain_WD.

If this helped you, like and choose it as best answer - you might help someone else with the same issue. ^_^
WDC Representative, http://www.wdc.com/ 

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The speed boost of RAID0, for example, makes more sense when used with HDDs are SSDs are already fast enough for most of consumer-level applications, games and everyday work and doubling it would make little difference compared to doubling the speed of a regular HDD.

Did you mean as?

PCPP Version | Text Version 

 

 
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Did you mean as?

 

Yes, my bad, apologies. :) Thank you for pointing it out.

 

Captain_WD.

If this helped you, like and choose it as best answer - you might help someone else with the same issue. ^_^
WDC Representative, http://www.wdc.com/ 

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Yes, my bad, apologies. :) Thank you for pointing it out.

 

Captain_WD.

That's okay I was interested in learning more and your answer helped a lot but I got confused and just wanted to clarify :)

PCPP Version | Text Version 

 

 
LTT Beginners Guide | My Build Log | 80+ Efficiency Explained | Mechanical Key Switch Guide
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