RAID Technology

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12 hours 9 minutes
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this is less than 5.5. We're gonna talk about Ray Technology,
an overview of raid zero
15 and rate in.
Let's go and get started.
Okay, so let's have a brief ray technology overview. Then we're gonna talk about the rate levels in detail, and we're gonna finish off talking about the hot swappable drives this. Let's go ahead and get started.
Raid Ray Technology Raid. Redundant array of inexpensive discord drives or redundant array of independent disc however you want to call it, it is a data storage virtual civilization Technology that combines multiple physical disk drives component into one or more logical units
for the purpose of data redundancy, performance, improvement or both.
Raid by works by placing data on multiple disc and allowing input output operations toe overlap in a balanced way. Improving performance because the use of lights will disc increases the meantime between failures or MT. BF. Storing data re definitely also increases fault tolerance.
Rada rays appear to the operating system as a single local hard disk raid employs the techniques of disk maring ing more dis striping, mirroring copies. Identical data on to more than one Dr Striping petitions
each drive store spares you into units ranging from a sector of 512 bytes
to several megabytes. The stripes of our disk, our inner inner 11 and addressed in order.
Now Ray technology is one of my favorite topics to talk about, discuss and use. I've used rate for many years in many different situations with us for desktop as well a server applications. And believe me, raid is one of those technologies that
once you learn a little bit about it and start using it
when you look or half on application, that needs data to be saved. Or you can not do without that data. You want to use rate, it will save you. It will save you a lot.
Okay, so first, before we jump into the rate levels, let's talk about ah, hardware versus software raid. There's two kinds out there, and both have its advantages, and some have. His disadvantage is so hardware raid versus software rate in hard word rate.
The drive's connect to a ray control a car that's inserted in the fast P C i E.
Slot on the motherboard. And there's PC III again, that critical component of a lot of systems this works the same for larger service is when his desktop computers, many external ray driving closers, have ray control the cars built right into him. So those nasty vices, or those separate
ray controller stores, devices that outside of the server the PC they have our control, a car built right into them.
So hard word Rain works through a ray control the car built right into the server. And that's what controls the raid or give you the ray functionalities and depending on that type of card and the vendor would be the levels of rain that you can manipulate the drives with.
I've seen some rate cards that has pretty much all the ray levels or limited to just certain certain runs. And a lot of times they would have their old certain software interface, where you can connect those rates or configure those rates, um, pros to rate hardware rate. It's
It's a standard across many operating systems, meaning if you had a server with a rake controller card, you could install many different operating systems, whether it be a windows based or letting space. Those raid car hard word cards will work with those many in different operating systems.
One of the cons about array control a car. It tends to be a little bit more expensive. You talk more more
hardware, high cost hardware. So those the pros and cons off the hardware raid application
software rate storage drives are connected directly to the computer or server without a ray controller. A raid configuration is managed by utility software in the operating system, which is referred to as a software rate. Set up numerous operating systems support rate configuration, including those from Apple, Microsoft, various linen flavors as well as
open BSD, FreeBSD, Net, BSD and Solaris, UNIX
pros and Cons. You don't have a high cost. A sw. Far, as with a dedicated ray controller card, the operating system can control that rate. Cons about suffer rain is because you don't have that control of card. You have a lower price point, but however, you may be limited
to the flavors of Ray that you can use in that system. The software may only support one and 00 rate or raid one.
It may not support the entire line of levels that you may be needing, and it's also operating operating system specific, say friends. If that's a window specie that you're using that software rain on, you may not be able to get the same functionality out of an apple or micro are Lennox
because it's suffer based. So those are the pros and cons, and depending on your application, you would have to choose what's best for you in your application.
So let's go ahead and step through the ray levels here and talk about these for a little bit.
Raid zero Known as striped Just this configuration is the least redundant. This corporation has striping but no redundancy of data. It offers the best performance but no fault tolerance. If one Dr fails, everything is lost.
One of the benefits here and raise zero is that it's fast. The performance here is a very good performance,
but you would only want to use this situation if your system is doing frequent backups of the data somewhere else. Off of the often disk drives here, um, again, it writes the both dist
really, really fast situation. But if you want this fails, you lose that data
raid one, also known as disc mirroring. This configuration consists of at least two drives that duplicate the storage of data. There is no striping. Re performance is improved since either Diskant be read at the same time. Right performance is the same as for single distort. If one drives fail,
an identical copy remains on the surviving Dr,
and this is probably one of the more, um, say the go to rates is raid one, because again you can use it with two drives. One dis fails. You have your data still there on the other Dr Bare minimum basic rate at its best right here.
Raid five. This love was based on block level striping with parity. If you remember what parody is, it is Eriko detection. Back from the memory lessens the parody information stripe across each dr, allowing their rates of function even if one dr were to fail.
The Rays architecture allows, read and write operations to span multiple drives. This results in performance that is usually better than that of a single drive, but not as high as that of a raid. Zero array. Raid five requires at least three disc, but it's often recommended to use at least five disc for performance reasons.
One of the most secure ways to set up disk
now. Icahn to raid five. This is probably one of the most expensive, too, because of the required five disc that's little generally expensive cost, depending on the application s Oh, that's Raid five. Now let's look at Raid 10
or raid one plus zero, Combining Raid one and Raid zero. This level is often referred to as rate in, which offers higher performance than raid one, but at a much higher cost and raid one plus zero. The data is mirrored and the mirrors are striped,
so you have mirroring and striping going on and raid one plus zero.
And I've used this one on a lot of different applications. And because you get the possible of both worlds, you get mirroring and striping.
So let's talk about how swappable drives. A feature of Rada raising system is being able to hot swap drives or the system is hot swappable. What this means is that any event of a hardware failure and a drive is no longer functioning. You can replace that drive while the system is running, maintaining 100% up time.
Drives are able to be inserted into the chassis is in removed without
any downtime whatsoever. So if you have a high critical environment in your system is running operations that cannot be cut down and you do have a rate
and you have your system set up. That way, if a drive fails with hot swab or hot swappable drives, you can replace that drive without taking the system down, thus causing your company or your customers downtime to do maintenance. You can hot swap them right there on the spot while the machine is running. This is a very, very, very bad,
beneficial and valuable feature
of raid arrays.
Okay, so we have talked about a ray technology overview, and we've stepped through the ray levels that you would need to know for the camp. Tia es plus rate zero rate one, raid five and raid one plus zero or rate 10. Also, we talked about hot swappable and that particular feature.
that is it for this lesson. We will see you in the next lesson.
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