What is Erasure Coding – A Shield Against Data Loss

https://www.simplyblock.io/blog/what-is-erasure-coding-a-shield-against-data-loss/

@madeindex I did have a #fedora box but over a year and a half ago I made a terrible mistake at stupid o'clock. One disk had a SMART error (bad sector) so I replaced it .. but then I thought to self: why not make /boot #raid5 like the others (server is #raid6 and #raid1)? I was not thinking ... /boot was messed up. Couldn't salvage it. And I haven't been bothered enough to repair it. #anaconda is pathetic with md+lvm and I have the laptop so not worth it to me for now.

Random update that hits both my #photog and #sysadmin roles; I ran out of disk space for my raw #photography recently. I have a home-made #NAS box with a pair of disks in #RAID1 running Rocky Linux and I needed to get more space. I spent an evening shopping around for the best value I could get in local disks and that required driving to three Canada Computers locations to pick up one drive at each so I could build a #RAID5 array and not deal with this again in the near future. [ continues ]

Ok: this is the foundation of my new #raspberrypi #arm64 based #kvm infrastructure. Will do #RAID1 on the #nvme storage for the VM data and back it up via #iscsi on #nas with #raid6
Still working on the migration strategy for the x86 VMs ...

Finally got my NAS setup

Just cloning my google drive to finally abandon it!

6tb raid 1 (12tb raw)
#NAS #HomeServer #DataStorage #RAID1 #BackupSolution #DataSecurity #TechSetup #SelfHosting #CloudBackup #GoogleDrive #StorageTech #Cybersecurity #Programming #TechLife #TechDIY

Ich brauche nochmal #Brainpower der #EDV #Bubble 🤣

Da mein bisheriges, betagtes, leistungsschwaches 1-Bay #QNAP #NAS sehr langsam ist, z.B. beim #rsync, habe ich inzwischen das #Ugreen #NAS #DPX2800 gekauft, mit 32 GB #RAM aufgerüstet und 2 #NVNE mit je 2 TB eingebaut.

Azf den beiden M.2 ist #Proxmox im #ZFS #RAID1 installiert. #Homeassistant und #TrueNAS laufen je in einer #VM.

TrueNAS soll nun einen #Datenpool in Form eines verschlüsselten ZFS RAID 1 auf 2 16 TB Festplatten bekommen. So weit so gut.

Nur: Wie bekomme ich die #Daten vom alten NAS, die in einer verschlüsselten #LUKS #Partition liegen, in den Datenpool?

Über #Netzwerk kopieren ist keine wirkliche Option. Das ist für ~ 10 TB Nutzdaten viel zu langsam.

Bitte #Boost für mehr Reichweite. 🙏

予備機が正しく機能している #RAID1 #ホットスタンバイ #二重系 QT: 石破首相、予備機を使用　政府専用機に不具合：時事ドットコム https://www.jiji.com/jc/article?k=2025061800992

Excited for Btrfs RAID1's "preferred read device" feature in Linux 6.14. This allows to have one fast device, example SSD backed bcache device and other slow cheap hard drive. We can set the bcache deice as preferred read device so reads are always fast.
It also wears down only one disk reducing the chance of both the disks evenly wearing out which increases the chances of both of them failing around the same time.

From the pull request:

> more read IO balancing strategies (experimental config), add two new
ways how to select a device for read if the profiles allow that (all RAID1*),
the current default selects the device by pid which is good on average
but less performant for single reader workloads
- select preferred device for all reads (namely for testing)
- round-robin, balance reads across devices relevant for the requested IO
range

Source: https://lore.kernel.org/lkml/cover.1737393999.git.dsterba@suse.com/

#btrfs #linux #linux_6_14 #filesystems #bcache #raid #raid1 #nas #selfhosting #selfhost

Oh boy, setting up this #RAID array is gonna be an overnight ordeal 🤪

Last time I manually set up raid (specifically #raid1) was with two 4 Tb drives. Which I do not recall taking too long; maybe an hour or two. Now I am doing four 12 Tb in #raid5. Good thing I am on summer break 😅

@var it’s nice to have a separate dedicated computer for managing the backup. You really need to have all backup disks attached to SATA. USB is not reliable for backup purposes because is likely to lose data when a sudden power outage occurs. So if you have (for example) 4 disks that all attach to SATA, that is a lot of IO happening, which you really don’t want when you are using your computer for other things that may need that IO, especially games or multimedia. You’ll notice the performance hit if it is backups are happening on a computer that you use for other things.

Also, it’s nice that the NAS comes with software that takes care of things like software RAID-1 or #ZFS for you. Some #NAS products will do #RAID1 in hardware for you.

#tech #hardware #selfhosting

Time to sort out my data backups accumulated over time and purge the unneeded old ones 🙃

I was also thinking replacing them with SSDs but don't see much benefit atm, only cost.

Better if I make a NAS from the old miniITX system laying around (even if it's quite underpowered and missing some parts 😬 ) and use 2 of those HDDs in a RAID1... When I will feel myself not too lazy ofc 😀

#springcleanup #databackup #hdd #ssd #NAS #raid1

So ... I've been looking for a small machine that I can slap two SATA SSDs in for a long time. And I never even considered Mac Minis before. But apparently their "Server" range has space and cabling for two SATA3 disks. Do I have anyone "in reach" here who has experience with these boxes? Looking at "Late 2012 Server" right now because it has USB3 as well. Are they prone to overheating or otherwise exploding? Do they take Linux reasonably well? #macmini #raid1 #apple

and this is what happens when a #lizard waltz around your #SATA cables :)
here a #repairing #scrub from the #RAID1 #BTRFS array of #HDD .

#Beware the lizards!! 🦎
#computer #computers #systems #linux #FS

How I switched us.slackware.nl from lilo to grub

Today I finally switched my US server from lilo to grub as its bootloader.

The reason for doing it now, is that I usually do not have a remote IP console (KVM) to that physical server which is located in a US datacenter whereas I live in Europe. This server's storage is configured as software RAID1

https://alien.slackbook.org/blog/how-i-switched-us-slackware-nl-from-lilo-to-grub/

#Slackware #Software #gdisk #gpt #grub #lilo #mbr #raid #raid1

Trying to get some decent perf out of an old HP Microserver with hybrid Linux #RAID1 (ssd+sata). It can be done!

https://www.nux.ro/Hybrid_RAID1_performance_tests/

@samurro
I had to ditch LVM. You just can't remove a drive and boot without manual intervention in initramfs.

The complete process is described here: https://dahlem-consulting.de/install-debian-on-raid1

#debian #raid1

I tried this solution https://serverfault.com/a/1144562 at least the installer goes through without a grub error, but the system still doesn't boot after the installation is through. Installing #debian 12 on a software #raid1 with #uefi seems like a high ask of the debian installer...

@robertdahlem The question is how do I get a raid on my installation partition going. I want to have a #raid1 across two smaller disks where root is installed, the installer now fumbled (grub error) when I tried to do it manually.

I am looking for a tutorial/advice/best-practice on how to setup a #debian server with multiple disks on #ext4. Machine for now should just be used as a fileserver until we integrate the #infrastructure into #proxmox. Still I am unsure how to format the disks. Looking at previous setups we used #raid1 for the root partition and #raid6 for all additional disks. I am just not sure how or where #lvm should come into play...