Redundancy Strategies and RAID - CompTIA Security+ Performance Based Question
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- čas přidán 1. 05. 2023
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"Radio Selectors" are referring to the "yes and no" options under which raid configuration to use to protect data. It's a term used in web developments.
Thank you, you have been so helpful, I am so happy I stumbled upon your videos my exam is in 15 days and been spinning my wheels a bit on key areas.
Most people don't know that when you do a multiple choice test, "radio selector" is the term for the bubble you fill in on the test. This is a poorly worded question, in my opinion, because you shouldn't compose questions that have terms not known to the general population. If you make tests all day long, and you compose test questions, then "radio selector" is a term you will use as a professional all the time. The test composer should use "choose the bubble" or something like that.
Thanks for sharing this. I didn’t know what radio selector was.
Having ADHD, I have the ability to remember stupid shit and I share it when its needed. @@lertub 🤟
I took the test a week ago!
The test is FULL of terms the general population does not know
Like controller selector for tv input …. No one literally uses controller selector to describe tv input
The test definitely needs to be looked over … it’s unnecessarily misleading and tries to trick you with every question
Thanks!
The RAID 5 question and the 'correct' answer seem nonsensical to me. If any two disks fail, you still have Bit 1 and Bit 2 on the one remaining disk with an unnecessary parity bit. How is this not just triple mirroring like the RAID 1 image above with a useless parity bit on each disk (notice that it's exactly the same with just one parity bit added to each disk)?
Here's how the setup should look like for RAID 5:
Disk 0:
Row 1: Bit 1
Row 2: Bit 3
Row 3: Parity Bit (for 5 & 6)
Disk 1:
Row 1: Bit 2
Row 2: Parity Bit (for 3 & 4)
Row 3: Bit 5
Disk 2:
Row 1: Parity Bit (for 1 & 2)
Row 2: Bit 4
Row 3: Bit 6
With this setup:
If Disk 0 fails, you can recover:
Bit 1 using the parity on Disk 2 (Row 1) and Bit 2 on Disk 1.
Bit 3 using the parity on Disk 1 (Row 2) and Bit 4 on Disk 2.
The parity of Bit 5 & 6 isn't needed for recovery in this scenario.
If Disk 1 fails, you can recover:
Bit 2 using the parity on Disk 2 (Row 1) and Bit 1 on Disk 0.
Bit 5 using the parity on Disk 0 (Row 3) and Bit 6 on Disk 2.
The parity of Bit 3 & 4 isn't needed for recovery in this scenario.
If Disk 2 fails, you can recover:
Bit 4 using the parity on Disk 1 (Row 2) and Bit 3 on Disk 0.
Bit 6 using the parity on Disk 0 (Row 3) and Bit 5 on Disk 1.
The parity of Bit 1 & 2 isn't needed for recovery in this scenario.
This demonstrates how only one disk can fail. In the CompTIA question, two disks can fail which is not typical of a three disk RAID 5 setup.
you are the man
I jave seen a lot of questions in the past involvinf RAID 0 also, full stripping with no mirroring
The RAID 1 entry in the All-In-One Sec+ book says, "...copies the data from one disk onto two or more disks. If any one disk is lost, the data is not lost since it is also copied onto the other disk(s)." (Pg. 209)
That is a weird way to phrase it to me. It seems to imply that you have your actual storage disk and then two additional backups? I assume they just mean your storage disk and a backup is RAID 1....maybe.
Or is it more typical at the enterprise level to maintain more than one backup copy of things - it would make some sense.
Great question! If you were going to have three or more disks available, then there are better RAID options available. That's why you don't often see a RAID 1 with more than two disks. Plus, explaining RAID 1 with more than two disks is very confusing. The simplest explanation is that a RAID 1 is a simple copy of one disk to another.
At the enterprise level, an organization would implement a more advanced backups strategy, such as full/incremental or full/differential backups. So, an organization might not even incorporate RAID into their backup strategy.
in raid 5 disk 2, is there a particular order of choosing Bit order?
Im wondering the same thing. The whole soduku thing confused me. I have a strong feeling it does not matter.