Need ZFS replacement help

Support
1

Hi. ZFS is dropped. Now there is a task to replace it. My NAS is running Manjaro on SSD and also has two ZFS mirrored HDD for data. Can you, please, advise the way to overcome this mankind-eliminating event? In particular, what to use for HDDs mirroring?

And I am ready to replace HDDs with another HDD pair on occasion. So, to migrate, 2 + 2 HDDs can be mounted simultaneously, I guess.

2

What exactly are you asking?

Do you just want to transfer the files EXACTLY (a file-clone) to another partition that is not using ZFS?

If so, create the new filesystem and use rsync (with correct attributes so EVERYTHING gets copied).

3

btrfs has mostly the same features as zfs, and it’s part of the kernel, so you don’t need any special drivers. It supports mirroring and striping, albeit not RAID 5 or 6.

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4

Thanks, will try. Have not found among Manjaro docs any info how to configure raid1. Hope, Btrfs - ArchWiki will be appropriate.

5

My question was about fs to use, and btrfs is already advised.

6

Strange attitude…
I see no question about what file system to use.
I see this question though:

Also, I suggest you close the tread since you got your questions answered.

But I back off then if you feel I only offend you with my question somehow.

7

Probably sometimes it is a good idea to start with a thread title.

1 Like
8
9

Ok, at the moment /dev/sdb and /dev/sdc are used with ZFS. My steps are:

  • connect new drives (presumable they will be /dev/sdd and /dev/sde
  • create primary partitiions on both with fdisk
  • mkfs.btrfs -d single -m raid1 /dev/sdd1 /dev/sde1
  • some way mount new raid1
  • copy data
  • poweroff, unconnect old drives, power on

At this point new disks will get /dev/sd-names of the old ones. Will it affect raid1 config some way?

10

It is always best to use UUIDs or PARTUUIDs instead of block device names.

1 Like
11

UUIDs - do you mean /etc/fstab?

12

You can use them everywhere. :point_down:

[nx-74205:/dev/pts/3][/home/aragorn]
[aragorn] >  ls -l /dev/disk/by-uuid/
total 0
lrwxrwxrwx 1 root root 10 Nov  6 15:23 1aedac7f-403b-4d85-9643-0d622be75453 -> ../../sdb2
lrwxrwxrwx 1 root root 10 Nov  6 15:23 3f1852bc-be95-4e42-8d46-25bafac4ce79 -> ../../sda3
lrwxrwxrwx 1 root root 10 Nov  6 15:23 6d475769-c92c-4935-b2af-a53d29dcd898 -> ../../sda7
lrwxrwxrwx 1 root root 10 Nov  6 15:23 6e756bf9-2d7c-401a-a0f3-bb4ea3b824a9 -> ../../sda6
lrwxrwxrwx 1 root root 11 Nov  6 15:23 6fbd221f-5d46-40f0-9fbf-4479d73874b4 -> ../../sda10
lrwxrwxrwx 1 root root 10 Nov  6 15:23 8462b14d-4a97-4383-a55d-61fcd136aeb9 -> ../../sda5
lrwxrwxrwx 1 root root 10 Nov  6 15:23 889d4e36-e279-4b82-838a-a5c1d4964e1a -> ../../sdb1
lrwxrwxrwx 1 root root 10 Nov  6 15:23 8de45432-efe5-4d76-beb9-fcb3247a063e -> ../../sda4
lrwxrwxrwx 1 root root 10 Nov  6 15:23 924f11d8-4bec-49a6-852e-033ce5e3d6a3 -> ../../sda2
lrwxrwxrwx 1 root root 11 Nov  6 15:23 bdf6a9f6-a2a7-47a0-ba6f-7bbf71a01a95 -> ../../sda11
lrwxrwxrwx 1 root root 10 Nov  6 15:23 CEF6-EF5C -> ../../sda1
lrwxrwxrwx 1 root root 10 Nov  6 15:23 db2385c9-2715-408e-96b4-52086a0292fe -> ../../sda9
lrwxrwxrwx 1 root root 10 Nov  6 15:23 e3fe76c9-8dea-4a27-8f47-839bb464f022 -> ../../sda8
13

I’m currently working on pre-compiled ZFS modules for all major kernel series we support. There was a problem on how to compile the modules. So lets see how that goes.

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14

A motherboard has got four SATA socket only. So, the first one is used for boot/system SSD, 2d and 3d ones for ZFS mirror, and I need two to configure btrfs raid1. The question: is it safe for data to disconnect one of ZFS drives to free SATA slot?

15

Considering that it’s a mirror, it should be. But I’m not too well-versed on ZFS. :man_shrugging:

16

Probably @philm does know as far as he deals with ZFS modules.

17

That’s not quite accurate. My current board has 6 SATA ports, for example, and the board previous to that had 8 SATA ports. There was a time when 4 SATA ports were more or less standard, but that was many years ago.

That said, it’s not unheard of to find the occasional low budget board with only 4 SATA ports, but they seem few, and far between.

18

Sorry, I’m sure you know my hardware much better than I do. But with the motherboard… Well, you can be sure yourself, it is MSI H110M Pro-D. It isn’t too dated (6G SATA) and is sufficient for NAS.

But what about ZFS drive detaching? Is it safe?

19

Apologies, for misunderstanding your comment:

It seemed to be a clear generalization, rather than referring to your specific hardware. Perhaps I need to take night courses in English.

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20

It should be, given that it’s only a mirror, and that RAID is designed with hardware failure in mind.

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