I should have said that raid 5 can be expanded (although this does depend on the controller) . But it is risky as you cant expand a raid 5 array without loosing fault tolerance. A rebuild is triggered when expanding raid 5 whilst it redistributes all the data across the disks. Until its finished if a disk fails the array would be lost. Expanding the Unraid array doesn;t require a rebuild or loosing parity. Same with adding a second parity drive.

I wouldn't say the video is long, I'd say it's full! You're a real source of information and a total enabler in the sense that you enabled me to understand and do many things with unraid I never could have done otherwise. Thanks Ed! The timing on this video was great for me, I just upgraded to dual parity and wasn't quite sure how it works,

I keep finding myself looking at your videos over the years. Thanks for the legwork documenting all this stuff.

Just recently i was trying to find a way to explain to my friends how Unraid party works. This came perfectly. And amazingly done as always, thank you for all the work you done for the Unraid community!

This is very interesting, thank you for making this video, would have never imagined someone doing videos about such specific stuff.

While there are plenty of applications a Raid setup is better. I did a lot of research before choosing Unraid and videos like this confirm that I made the correct choice for my needs. I started off almost 2 years with 3 - 8TB ironwolf's (2 Parity 1 Data) and a 250gig ssd cache drive. Now I'm up to 10 - 8TB drives including the 2 parity with a mix of ironwolf, red plus, and n300 and a 1TB cache drive. I have enough room for 3 more drives in my case so I'm begining to plan ahead of time the options if I need to expand farther.

Thanks for the video, all the way up until the end with the XOR explanation even, it all made sense the way you presented it!

Extremely helpful video (per usual). I'm sure I'm not alone in conflating the parity disk function in Unraid vs. RAID, and this changes the way I will approach hardware planning. Very much looking forward to the array shrink video - I have a disk that has started throwing read errors that I need to remove, but have struggled to Unbalance.

Good video! A great primer for those who may be confused about it. It might be helpful to add a video explaining the differences between parity and backup as well as I know lots of new users seem to be confused about that.

Great explanation of how Unraid's parity works

Talk about timing one of my classes just covered parity yesterday! Watching this video really helped solidify those concepts so thank you! :D

Just getting into Unraid with my old gaming pc and some old hdds and ssds. Looking to upgrade my Synology 918+ and I needed to wrap my head around the parity disk and this helped a lot - Cheers!

Very informative & useful video. Great work!

Wonderful stuff! I had a basic understanding but actually learned a lot, thank you! :)

This video is wonderful, thank you.

Great video Ed! Thank you for sharing it with us!💖👍😎JP

Great video thank you for the explanation!

Great explanation thank you

Great explanation. Thanks.

Perfect!!! Thank you!

Didn't realize a second parity disk wasn't just a copy in case P1 fails, good to know going forward. And I suppose I should look for an actual internally rated drive to replace the drive instead of the shucked one in there. Thanks as always, I'm very new to unraid so these core beginner tips are always appreciated.

I love you Thank you for being a great teacher!

Nice video, very informative especially for the people that don't read the wiki before incorrectly associating the kind of parity unRAID does to others.

Great video!!! btw, 25:15, there is simpler calculation for this: 1+1+0+1 = 111, take the last number and we have "1"

Thanks! I get it now! :)

Another Great video. Have to say thanks for all the videos you make on Unraid. I've learned a lot over the years from your videos. Just wonder if you have a video on configuring iSCSI on unraid? That works with Unraid Version: 6.9.2 ?

Love the detail at 2:47 with the Unraid logo, I didn't realize it was getting bigger and moving up the whole time until it was pushed down xD

Great video. Could you do a similar video about ZFS (Z1, Z2, Z3) vs Unraid? Also could you make a video about protecting files that will never change (movies and photos)?

Good video!

i HONESTLY DON'T KNOW WHAT I WOULD DO WITHOUT SPACEINVADER ONE!!!!!!!!!!

Thank you sir

Watching Space Invaders video on a VM he helped make possible, Kudos. Listen to this man.

I don't use unraid, but I learnt a lot from video. Nicely done.

Great video. Been wondering what the actual differences between RAID5 & Unraid was. Thanks!

I like the long format of this video. How about a part 2 for the nerds? How parity drive 1 works is simple enough and is explained everywhere. I want a deep dive on parity 2. No one ever explains it at all.

Tthank you.

This is very helpful understanding Unraid vs raid, thank you. What can we do with Zfs now that Unraid has it? should cache pool be zfs?

If I have understood it correct, when zfs is coming to unraid, its for its own pools and not replacing the unraid raid pool

I've been going back and forth new videos and old videos because I'm rebuilding my unraid server. So far I know for sure to use my nvme drive a cache drive but even though I understand this concept you're explaining I'm not sure 1) what size the parity drive needs to be based on my environment and 2) if I'm using raid 1 in a pool does it even matter or is the parity drive just another share drive independently for a safer redundancy.

Great video, I had a question that may be dumb. With Unraid, If you have a 16tb parity drive and say (4) other 8tb drives. Does that ONLY give you access to upgrade the others later to up to 16tb while protecting just 1 failure at a time? Or could the single 16tb disk parity drive it could cover a possible 2 drive failure?

thank you for the fantastic videos that I have watch religiously over the last few weeks while setting up my Unraid server, I hope this isn't asking too much but is there any chance you could do an updated video on rclone? as I cannot wrap my head around mounting a Google drive for Plex, I am coming over from Windows and cannot figure out these damn config files

Who can name a handful of other software packages that offer "all parity on 1 disk" possibilities? It's a very clever method, but is UnRaid the ONLY choice? I love the "all parity on 1 disk", the "add disks at random", the "remove disks at random", the "mix any size/speed disks", the "spin down when not in use", and all the other great features. Why haven't DOZENS of other companies used those features?

I need to setup two drives one to copy the other. Do I set up both drives as disk 1 and 2 or do I do a Parity drive and disk one?

One of my drives failed and i dont plan to replace it as my other drive has space. Also i am transplanting to new pc because i had to give original build to sister for projects. Now im ready to build new machine, whats the step to ensure my ip address isnt in conflict as my old one was 192.168.45, do i try to assigng the same ip address on the router or do i just update unraids ip address because i remember telling unraid what the ip address was when made the usb. Thanks

I watched this video a while back and everything made sense, but now I have gone to dual parity and am wondering how having two parity drives works... I have asked Google, but I don't really seem to be able to find an answer, and that seems to be the same for everyone else that has asked this question. Do you have a video for this?

Hello, which preclear plugin did you use in this video, please?

Does dual parity require 2 identical sized drives plus a matching size in the array?

can i use a partition of the bigger drive as parity drive and the rest of the drive as cache?

Wasn't a "long" video in my opinion. I actually skipped back a couple times. When it's the info I'm looking for there's no such thing as a long video. 👍🏽👍🏽

Can a cache ssd pool be 2 nvme drives?

Hey spaceinvader! Would it be possible for you to create a video on how to use fail2ban with nginx proxy manager on unraid?

One of the reasons I went with Unraid was the limited loss of data in case of a fail.

Can you make a tutorial installing pihole with unbound please

Sry my english is not very good but do i understand that right, when 1 Disk fails the Parity cant restore all that data to a new disk, it only looks for errors?

How frequently should you do a Parity-Check?

Anyone out there running shucked drives as their parity disk? I was just about to build my first unRAID server and use a shucked drive as my parity drive... Now I'm reconsidering!

I seen hard drives fail in the same was as pictured in the thumbnail.

RAID 5 can be expanded, as well as converted to RAID 6, been available at least since the SATA 2 days

🎯 Key points for quick navigation: 00:00 *📚 Introduction to disk arrays and parity for beginners.* 00:22 *🔍 Overview of parity and its role in Unraid arrays.* 00:50 *📖 Definition of parity in computing: checking binary values for errors.* 01:20 *💾 Explanation of binary data transmission and error checking using parity bits.* 02:29 *🖥️ How parity bits ensure data integrity in binary messages.* 03:13 *🔢 Example of using even parity to check data integrity.* 04:20 *⚠️ Parity bits detect errors but can't correct them; need for retransmission.* 05:44 *🔄 Introduction to parity disks for redundancy in Unraid arrays.* 06:12 *💽 Parity disk stores data to ensure even parity across sectors.* 08:42 *💡 Using parity to recover data from a failed disk in an Unraid array.* 10:35 *🔗 Comparison between Unraid and RAID 5 arrays.* 11:02 *🗂️ RAID 5 stripes parity and data across all disks, requiring uniform disk sizes.* 12:41 *🔄 Adding disks to an Unraid array without affecting parity.* 13:52 *🛠️ Using mixed-size disks in Unraid arrays without affecting parity.* 15:58 *⚡ Unraid arrays use less electricity than RAID 5 due to selective disk spin-up.* 17:22 *💡 Uneven wear on disks in Unraid arrays reduces simultaneous disk failures.* 18:46 *🛡️ Unraid allows adding extra data disks and dual parity for added protection.* 19:44 *💨 RAID 5 offers faster read and write speeds compared to Unraid.* 20:11 *🏎️ Use of SSD cache pools in Unraid to improve write speeds.* 21:48 *🖥️ ZFS pools rumored to be coming to Unraid, offering new storage options.* 22:01 *💡 Explanation of dual parity in Unraid: P drive and Q drive using different algorithms.* 22:56 *💡 Explanation of bitwise operations using a truth table.* 23:24 *🧩 Understanding bitwise OR operation through practical examples.* 24:04 *🔄 Introduction to bitwise XOR and how it differs from OR.* 24:32 *⚙️ Exclusive OR (XOR) requires only one condition to be true.* 24:47 *🔍 Applying XOR to parity disk calculation in Unraid arrays.* 25:01 *📏 Example of XOR algorithm for two disks, demonstrating parity calculation.* 25:15 *🖥️ Extending XOR to multiple disks in an array for parity calculation.* 25:44 *🧮 Final parity result using XOR for multiple disks in Unraid.* 25:58 *📚 Summary of how XOR algorithm is used in parity calculation.* 26:11 *🎓 Importance of understanding parity for shrinking Unraid arrays.* 26:26 *👍 Encouragement to like, subscribe, and share the video for more content.* Made with HARPA AI

Just point out a RAID5 can be expanded with more disks... linux software raid mdadm has de --grow flag, most hardware raid controllers allow this and BTRFS RAID with parity (5 or 6) is declared unstable by the developers so it's a big no if you care a bit about your data. The rest of the video is great even though you leave out some details about performance and parity checking or what happens if a disk gets corrupt and spits out corrupt data (with an XOR you can detect 1 error but cannot know which one is wrong or if there are more than 1 error) but seeing you thought it was a long video, I can understand why.

Hi. Your unraid content has saved me ton of times and always your videos come in superior timing. When im after someting unraid related, you have created an beautiful, easy to understand videofor me to follow on. However i have an request which i would really like and hope you to fulfill. Google is suspending free g suite accounts created before 2012, i have used my domain in gmail for decade, now google is planning to make this monthly subscription fee and im not up to it. Im already paying for youtube premium. So my question is if you could make a video setting up an mail server with your own domain name, secured and fully functional. I would love to donate for you, im shamed i havnt already (im poor), but this would trigger the donate button (not a huge amount).

Incorrect details on RAID 5 and adding drives as well as total storage with mixed drives...

Every time I think I've found a video that fully explains "how can 2 parity drives possibly work", it does not. ;-(

my brain went suicide ^^

I never understood why people swear by 'conventional' RAID systems. To me it feels like it has way too many downsides to it. Expandability is very cumbersome and has a high cost to it, since you need to buy and set up a whole new RAID in 1 go. If something fails, a drive or your RAID controller, you lose everything. Your drives will likely fail close to eachother, so the chance of an unrecoverable error is greater. It feels that is has way too many downsides, compared to the upsides. What do I miss? Why is this so popular? I can somewhat understand the use of RAID 0, 1 and 10 in some usecases, but 5 and 6 are beyond me.

That Platter doesn't look good.