question for tech-y storage people: I just nabbed 4 extra (used) disks with a 6 TB capacity from a place that re-sells electronics (oregonrecycles.com); I think they did some testing but obviously I dunno what to extent, and also, if it was just limited to stuff like SMART data, well...

anyway, I wanna RAID it, which is fine, but I don't know how much lifetime these have left on them. For four disks with unknown usage, should I use RAID6 or RAID10? It's not job critical data I'll be storing on these (mostly media and such). They'll eventually be migrated into a larger RAID array but that won't happen until I'm stable and can afford to rebuild my server so this is fine for now.

I wouldn't mind the better read/write performance that comes with RAID10 even though it has less parity. I suspect these disks were all used together so they might have similar wear/tear patterns; in that case, I'm wondering if RAID6's double parity actually buys me any extra life? Like, given 4 disks with the same history and a probably known disk failure rate, I'm not really clear as to whether double parity is going to make much of a difference (and that if one goes down, the others probably aren't too far behind).

#techPosting #raid #raid6 #raid10 #storage #nas

I was really worried about why the RAID drives on our new #Linux #server were so noisy. A quick "write" noise every second, like a heartbeat.

Some investigation revealed that a "journal" service seemed to be writing ~512k of data every second, and only when I had that exact amount did my googling/ducking generate a useful result:

When I set up the #raid6 stuff, I did a "lazy" ext4 formatting, so the OS keeps doing that extremely slow and noisy process in the background.

Non-lazy reformat, go!

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...

Anyone have experience deploying #btrfs in #raid5 / #raid6 configurations? I'm aware of the mdadm raid5/6+lv+btrfs approach Synology uses, and I've got a UPS and read-heavy workload so I don't really care about the native raid5/6 write hole but from everything I'm reading the "off the shelf" industry solution appears to be #zfs in raidz/raid2z

Okay, tell me why this is a horrible idea

I have 6x4TB HDDs, and 1x144GiB SSD

I want to take the following config:
- 5 HDDs form a #raid6 #LVM array
- 1 HDD is used either as a hot spare or normal disk (with a USB drive as hot spare)
- 1 SSD used as an LVM #cache

The bare drives will all be encrypted, so LVM on #LUKS. I will then put in 256 GiB swap, and the rest to #btrfs

On top of that I install #CoreOS

@nuron @ij
Ja gerade bei den Stichwörtern "unterschiedlicher Größen" und "flexiblen Verbund" ist #btrfs ein sehr gute und zu Empfehlende Wahl.
Aktuell sollte man halt noch nicht #raid5 und #raid6 nehmen.
Man kann #btrfs aber erst mal mit #raid1c4 gründen und später problemlos umconvertieren.
Aktuell habe ich bspw. ein #btrfs mit 60 HDD von 250G-16T im einsatz, das mal als #raid1c4 gestartet hat und aktuell als #raid1c3 läuft.
Sobald #raid6 stabil ist, convertiere ich das dann online um.

1/x

@schenklklopfer Es geht, #RAID0 #RAID1 #RAID1C3 #RAID1C4 gehen problemlos und #RAID5 und #RAID6 für die DATA Chunks gehen auch; Man sollte nur dann für die METADATA und SYSTEM Chunks #RAID1C3 nehmen.

#100DaysOfHomeLab #Day4of100

So another update from me, because sometimes things go slow. I've booted a #NixOS live image and the #badblocks program is running a check of my four 4TB drives (been running for 86 hrs and done 84% I think the last time I checked).

I did change my decision to use #NILFS2 & #RAID6. After deliberate consideration I've switched my choice to #ZFS with #RAID10.
— no longer NILFS2 because it doesn't have compression and ZFS even includes the kitchen sink
- 1/2

#100DaysOfHomeLab #Day3of100

So after more reading tonight for my *BACKUP* server (that will be its main purpose) I have decided to:
— create a 4 disk #RAID6 array with #mdadm
— have it use #NILFS2 as its file system (with continual #checkpoints and manual #snapshots)
— use @nixos_org as OS

I understand it have a performance hit, from both these decisions, but this will be the biggest part in my backup strategy.
TBD:
— filesystem for OS on SSD