In many cases, a sata-ii chipset controller only has sata-ii bandwidth available, so even a RAID-0 request that hits both drives equally will max out at a single sata-ii port speed. The same is true for dedicated hardware RAID cards that are not attached to a fast enough bus. Bread can only be handled and given as fast as the person's brain doing it can coordinate.
Now, if one of your hands gets chopped off, you lose half a loaf of bread forever. It fell somewhere along with your hand. You never have a whole loaf.
That isn't as good a approximation, since you can still eat half a loaf of bread. Here is where technical accuracy deviates somewhat from the analogy.
When your data gets broken in half, it is pretty useless usually entirely. BUT since some mundanes here are concerned about technical accuracy in a post asking for "plain english", I will point out that it is not correct that all the data is lost if a single drive dies in RAID It depends on whether a single "modular" in plain english data object perhaps a file, perhaps not fits within a single stripe, occupying a single drive. If say your stripe is 64K, and your file is 63K, then if it is on the surviving disk, then your file has survived.
It now becomes a job for data forensics and having FS table entries on the surviving drive. It is your decision whether the other half is still usable somehow. Just usually it wont be without a lot of work. In "practical terms", you won't see a lot of benefit from software-raiding two drives together, or otherwise in the device manager. Code usually fits into a single stripe, so only one drive would be active at a time.
The OS will fit mostly into ram. There are only a few circumstances where RAID-0 will give a performance boost. Get an SSD, almost all circumstances are covered. More accurately, it is a bit that checks if two original bits are together even or odd. Say, data bit A on one drive, and data bit B on another drive. Parity P would be a combination of A and B from different drives. RAID-0 has no parity. RAID with parity can reconstruct the missing drive.
There are too many other variables. For instance, without a dedicated controller, you can't RAID-0 your boot drive. That means it has to be a separate partition or drive -- ergo, the OS is not "accelerated".
So will you RAID-0 two data drives for programming? Have big files? Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Ask Question. Asked 12 years ago. Active 8 months ago.
Viewed 40k times. Improve this question. Community Bot 1. Edward Tanguay Edward Tanguay I'm also a developer. If you are working on typical code files not video or raw photos I think the Raid0 isn't your best bet. Go SSD! Add a comment. Active Oldest Votes. Improve this answer. Gaff John T John T k 25 25 gold badges silver badges bronze badges. You might want to note that as the OP was only planning on getting 2 drives. He never said that he's limited to 2 disks. He just wants to know how having 2 can increase performance.
As noted RAID-0 lacks the all important fault tolerance redundancy part. I would steer clear of it unless performance is the ONLY priority and even then it isn't all it is cracked up to be. It is good for copying large amounts of data but access times are not reduced and that is what is usually most noticeable in general use.
Any reasonable SSD will produce a much more noticeable performance boost although with a much smaller capacity. RAID-0 trades reliability for speed. Your throughput speed is very roughly doubled and your fault tolerance is halved.
RAID-0 is great for temporary storage of scratch data and also for your boot system assuming it's well backed up but don't use RAID-0 for long term storage of data you can't replace. I would think it would be more efficient instead of "doubling the chance of failure" -- not something I want to do to e.
Michael Dillon Michael Dillon 1 1 gold badge 6 6 silver badges 11 11 bronze badges. John T k 25 25 gold badges silver badges bronze badges.
Samwise Samwise. Modern RPM drives can't saturate a single bus. The benefits in this case are the splitting of the blocks in a stripe across the two disks — MDMarra. But this answer is still correct in pointing out that the theoretical transfer rates ought to be doubled. But if you're still keen on going for speed then RAID 0 is like this: You have two drives, drive1 and drive2. We're not delving into random read access times yet So that is a super simplified version of RAID 0 and 1. If you want to use it, then thi sis the simplest explanation I can give: Imagine a secretaty writing or reading froma book.
My question is if i want to add more hard drives to my raid 0 configuration , can i add 1 more drive for a total of 3 drives, or do i have to go with 4? Aug 20, 0 18, 3. You can add a 3rd drive, but you won't see much difference. I'd set the 3rd drive up as a backup instead.
Hovaucf Distinguished. May 6, 87 0 18, 0. Make sure all the drives are the same model, have the same FW, and you have cache enabled for best possible performance. Mar 5, 0 18, 0. Well, I'll split the difference between the last two posters. On the down side, with each added disk you increase your odds of having a failure - and thus knocking out your Raid0 array.
As with anything, make sure you make backups periodically so you don't lose any important data if you do have a failure. Aug 10, 88 0 18, 0. I have a gigabyte epds3r, its using the intel raid ich10r controller. How do i enable cahce??? You can enable disk cache it should be enabled automatically.
The chance of failure of HDD these days are not as high as some people boast. If you're using R0 you dont have to worry about the controller as there is no parity, and little work needed to be done by your cpu.
I'd agree that HD's tend to be pretty reliable these days - but having said that, the fact remains that you are increasing your odds of a failure by running in a RAID0 config doesn't stop me from doing it myself - but people should be aware of it and take the appropriate precautions.
As for the benefits of doing R0 - that certainly does depend on the controller and system setup. I'm trying to find a link to an Anand article that showed R0 on mobo controllers perf not worth it - barley better doing R0 with two new Raptors then with a single Raptor for almost all applications. Their conclusion was for that type of setup, its not worth the extra risk.
If you use discrete controllers, things change. Mar 23, 3, 0 20, 1. By the way, you wont just be able to add the 3rd disk without re-creating the whole array on that controller. So if you do an another one, youll have to backup all your data wipe the array and start from scratch. Hey great article on the raid controller cards, seems like there alot better than the onboard intel ich10r controller.
I know i have to wipe out and reformat my drives when i add the 3rd drive, thats ok because i dont have alot of stuff on them now, been playing with memory, hard drives etc, my other 2 samsung f1s come tomorrow so i will try 4 drives check the performance and try 3 drives and check performance, and go from there, but i think a raid controller card is in my near future for sure, thanks for all your great information and advice guys.
Well i have been running 4 samsung spinpoints f1s gb in raid 0 , and im very happy with the performance, outstanding hd tune scores.
Every drive has a limited lifespan and each disk adds another point of failure to the RAID. RAID 1 mirroring Mirroring creates an exact duplicate of a disk.
Every time you write information to one drive, the exact information is written to the other drive in your mirror. Important files accounting, financial, personal records are commonly backed up with a RAID 1. This is the safest option for your data. If one drive is lost, your data still exists in its complete form, and takes no time to recover. Your investment in data safety increases your drive costs since each RAID 1 volume requires two drives.
Your data is spread across all the drives in the RAID along with information that will allow your data to be recovered in case of a single drive failure. At least three drives are required for RAID 5. No matter how many drives are used, an amount equal to one of them will be used for the recovery data and cannot be used for user data.
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