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“And welcome back to now s compares today. I want to talk about right now now a number of you had the probably heard of right. But it s definitely revisiting this subject. But as more and more people are investing in network attached storage or director.
That storage and they don t know about right now right stands for redundant array of independent disks or if you re older redundant array of inexpensive disks. But these definitions have changed over time. And it s very much based on when you grew up around the data storage revolution. But um.
What radius is the ability to have a device filled with data and if one of those drives dies being you know hard drives are the second most fragile item in a data storage around with the psu at first place power supply unit. And if that one of those hard drives dies that you don t lose the data and the way raid. Works is dangerous spread across multiple data drives creating something called redundancy. And what redundancy is its redundancy is an area of failure failure.
It is basically a drives worth of data in most cases. That gives you the ability to lose at least one driver data and not lose any of the data on all those drives so any one of those drives can go. But all the data will still be fine the other thing. This is calculated is something called parity.
No parity is it s the calculation of that redundant and space of data. What parity is it s kind of the formulation of the data on those disks and we will revisit parity later as we go through all of these different raid levels. But let s let s go for all them now some of them aren t on that list now should probably give them an honorary mention straight away the first one is span. Now what span raid is is the ability for data.
It s very similar to a raid zero. And we ll touch on that in a second. The other one is j. Bot joke.
Just a bunch of drives and what that it is drives inside storage enclosure that are all kind of independent. Now people normally go through this so. Though it gives you no protection whatsoever in both in terms of redundancy. And there s no apparently being created what it means is a device that has all their drives in j.
Bot. Just a bunch of drives can then be connected to a raid card or a write system. Which will then conduct to the raid on software or hardware level. And what that in the reason.
That s not this is it doesn t really count as a rate one because it s not really a raid level at all and two because people who use it typically are still going to utilize one of the raids on here in that setup..
It s just off the initial machine. So straight away the first raid that we re really gonna talk about here is raid zero and a raid zero what it does is if you ve got say two drives of space. It just combines all the story together and your system will see one big enclosure. So a couple of full tb drives.
You re going to see itb of available storage. Now once again raid zero and span are kind of the same thing. But it s the way. The data is written across them in a raid zero.
Day data is written across the drives in wave soap drive. One drive to drive one drive to drive one drive to in waves across it and span. It goes drive one and then filter up and it goes on a drive to but ultimately in a raid zero or span. You see one drive the result is if one of those drives dies you lose all the data in a span you can recover it a little bit.
But ultimately in a raid zero configuration you lose all of that data because the data is spread across both of those drives and if one of the drives dies you automatically lose half of all of the entire own written data to the raid zero configuration. So radar is not advice for those of a safety frame of mind that said in terms of read and write. It s actually pretty good because you are both reading and writing to two drives at once thereby effectively doubling the potential read and write beat. So you don t get double.
But the actual work being done is done far quicker now a raid. One is probably one of the most common ones that people find particularly in to day scenarios. What it is is at least two drives or of course two drives look at that and all the data is written to both drives. But identically you the whole system will only see one drive be alone lessee one drives worth of storage.
Even if you ve got two 4 tb drives in a raid. 1. Environment your host system will only see one. 4 tb drive.
Because the other one is acting as that redundancy. So. The data has been written on both of them and read from both of them all at the same time. And if you lose one of those drives you ve still got all of your data on this drive right here.
And what again read and write speeds are improved in a rope on environment over a traditional single drive and once again that is because two drives are being read and written to bias after typically but of course. There are other connections now raid. 5. Is the most common smb small home and business raid.
I ve done so far to say what it does is if you one drive of failure now right fight..
Requires at least three hard drives. What are you maybe go one two three the three drives and weapons is data at once again is written across them like in the other eight configurations. But in this scenario. One one wave goes across it puts date on drive one down drive two and i ll drive three it creates a kind of digital blueprint of the data on the other two drives and popped it on there.
That is the parity data. And the next wave of reading of write goes across and this time it moves the parity onto a different drive. So it right on to the first and the third drive and that second drive this time will hold the parity. The blueprint of the other tip and it will continue going down each wave with the parity moving between each drive weapons is if you lose a drive if you lose one drive not only is your data on the other two drive safe.
But it can rebuild the data on that third from the parity thereby saving your data of course. There are disadvantages to this looking great system. One your read and write will be a little lower. And this is because of the calculation of the parity.
It s more the writing than the reading that gets affected. But there s no denying it that the write speeds will be lower due to the cpu having to work a little bit harder to write the parity in that right the second disadvantage. Is an a write five environment thing building the raid. 5 takes ages in a raid.
0 raid. 1 they can be built pretty quickly in terms of the truth a system for preparing this configuration. A rate 5 can take upwards of 8 to 12 maybe from 24 hours based on the number of drives in the host system. So it is a big big system to build on top of that if you lose one of the drives and you want to reclaim that data it takes a long time for the right configuration to rebuild one to introduce a new hard drive to replace the it s fun or you can try to read and write from the date that s on the remaining drives using the parity.
But you aren t going to be looking at 10 to 20. Meg s a second and it s pretty terrible now a rate 6 r cubed break. 4 8. 6.
Is exactly the same as of ranked 5 in almost every single way. But it gives you two drives of failure. You need at least four drive to get it running and in a raid. 6.
Environment. Two discs worth of parity are created. So once again the wave goes across it writes it right parity parity. Next.
One it right parity parity..
Right. And then it parity right right parity. And then it just goes on the parity is written across two drives to give you two drives of failure. But of course that is advantages.
One it takes even longer to build it takes even longer to recover. And the right will be even a be a little bit lower than a raid. 5 pistol parity is now being doubled there s twice the work being done by the cpu finally right. 10.
Now right. 10 is a slightly unusual one. And it s made for those that want speed and security. But once again there is a little bit of a gambling.
A calculated risk with a raid 10 in a raid team you need at least four drives got one two three four. You ve got your four hard drives and data is written to two disks and then as much as a raid. One environment right to cross on to those other two disks as well. Which is a combination of a raid 0.
And a raid 1 hence the name raid 10. It s a red one and a raid. 0. Because two drives worth of data are pulled together as one so we have four drives and it suddenly it s seen as two technically and those two are now in a raid 1 environment.
So and then your host system will only see one drive. But it s kind of a layer upon layer of right system for you to see the results are one you ve can technically recover from three disks out of two disks of failure. Because you could lose either one of those two and they ll still be the copy second advantage. The read and write are fantastic in the write.
10. Because of all the multiple drives being read and written to and they and raid. 0. And raid 1 not being typically they re difficult raid configurations the build the disadvantages hugely expensive you re gonna have it two drives of lost capacity second probably a bigger disadvantage is you are kind of running the odds.
Because if you ve got drive drive here being combined and drive drive here being combined and then running a rate one together. The worst case scenario is two discs together being lost. So these two here or these two here. If don t strive to get lost together.
Then you are in trouble because you can t afford to lose paired drives because then you lose all that data together so do better in mind in a r8n environment..
But we will wrap this up there s only two other rate configurations really worth talking about number one shr and number two beyond right now both of these respectively from synology and druther are kind of evolving rate configurations. What they do is they let you mix drives as you see fit and therefore build a raid out of them there all of the rate configurations. We talked about today if you use any of these you have to use the same drives the same type all together in that rate. If you use different drives not only or the system class every single drive visible as the lowest available drives.
If you ve got 480 b. s and 1 2. Tb. They ll all be seen as 2 tb.
But worse than that it will be an unstable raid. Unless all of those drives are the same whereas in shr and beyond rate. You can mix and match drives now. I know on the face of it that seems daft well earth would you want to mix and match drives.
Anyway. If you re buying a brand new system. But think three four five years down the line your capacity starting to get a bit full you know drives. But you know one of your drives might be you know getting a bit shaky.
You want to replace it you want to replace it with a bigger drive you want to increase that right you don t have to replace the entire set up and that s why i think like beyond right and shr are so appealing because they give you the ability to add drives later maybe the drive you ve got off seats production. You can t buy them anymore. Or you just want to get bigger and better drives shr and beyond right. We ll let you include bigger drives.
One by one and it will adapt the raid accordingly to give you that additional capacity. So do bear that in mind. But can be found the video. Helpful if you want to learn more to visit me in nazca pez.
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