Questions tagged [zfs]

ZFS is an integrated filesystem and volume manager, originally designed by Sun

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installed Ubuntu 20.04 with ZFS enabled, want to add another SSD to pool

I Installed ubuntu 20.04 with the ZFS experimental option enabled, indeed under disks and gparted I can see that most of my current SSD is occupied by a ZFS_member. I have very minor experience with ...
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Ubuntu 20.04 with ZFS, using a mainline kernel version results in “Failed to load ZFS modules”

If I boot with a kernel only a single minor version above (or below) the three shipped with my ubuntu 20.04 I get : [ 0.691104] Initramfs unpacking failed: Decoding failed Failed to load ZFS ...
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Not able to dist-upgrade ubuntu 20.04 with zfs because bpool is too large

I was doing a routine dist-upgrade to my zfs ubuntu 20.04. And the upgrade failed during the kernel linux kernel upgrade. I had to remove several snapshots from bpool in order for the upgrade to ...
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zfs dataset missing after reboot

I have a compressed encrypted zfs dataset that seems to have gone completely missing. There are quite a few google hits for 'zfs missing dataset' or similar, and they're almost always something like ...
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20.04 having trouble booting after recent updates

Running 20.04 with zfs. Started machine and was working normally. Booted into plasma desktop. I tend to update as soon as I notice that the system has some to install. This morning the noticed a long ...
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“Fusion Drive” arrangement

I am coming from macOS and am familiar with Fusion Drives, where an SSD is joined in software to a HDD to provide fast operation. Basically, the whole Fusion Drive storage unit appears to the user to ...
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Miss files after import then zpool upgrade How to Recover files Ubuntu server 20.04?

This is how I come to this. Was use freenas 11.1 then update freenas to 11.3 then move to ubuntu server. Default install of server then add: $ sudo apt update $ sudo apt install zfsutils-linux Then ...
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Ubuntu syntax - 'zfs' vs 'zpool'

Ubuntu/Zfs newbie. I'm trying to setup zfs on a new ubuntu 20.04 install. While going thru countless webpages I noticed that some commands used 'zpool' while others used 'zfs'. I also came across two ...
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Replacing a FAULTED disk in a zpool on Ubuntu 19.10

I have 4 disks in RaidZ0 in a Zfs pool. After upgrading from 14.04 LTS to 19.10 LTS about a few months back, one of the disks started showing errors. After scrubbing, the disk was marked as FAULTED ...
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Do parent file system snapshot reference it's children datasets data or only their onw data?

Data is referenced in as many snapshots you take and it will be deleted from disk only if you delete all snapshots that referenced said data as well as the data from the running volume, this holds ...
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Ubuntu 20.04 with root on ZFS errors after 'apt dist-upgrade'

I've been running 20.04 w/ root on ZFS for a couple of months now, with no major problems. This morning, I ran an apt dist-upgrade, and I got the following errors: mjb@feynmann:~$ sudo apt dist-...
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Ubuntu 20.04 thinks it's out of free space, but it isn't

I started to get "not enough free space" errors when trying to copy files, and at some point I had trouble booting and did a ZFS rollback. I still get space errors despite (according to df and du ...
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reboot takes long after zfs rollback due to “Syncing filesystem and block devices - timed out”

Problem Description Whenever I perform a zfs rollback -R tank/ds1/u18@2005291601; reboot, the reboot takes quite long. systemd-shutdown[1]: syncing filesystems and block devices - timed out , issuing ...
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Ubuntu 20.04 on ZFS can't update kernel, bpool missing

Symptoms Kernel doesn't update. That is after restart, the system is still on the old kernel. Changes to GRUB config aren't applied. Installing a new kernel isn't applying. bpool is missing due to ...
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Upgrading from 19.10 to 20.04 with ZFS on root after modifying datasets

I am running Ubuntu 19.10 with ZFS on root set up on installation. I created an rpool/encrypted dataset, moved my home directory to rpool/encrypted/mario, and added a systemd unit to ask me for the ...
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grub-mkconfig stopped working in Ubuntu 20.04 LTS

XUBUNTU AMD64 installation I am re-building a server to mirror my Ubuntu 18.04 server configuration, having given up on attempting the upgrade process. grub-mkconfig previously wrote grub menu ...
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Does the 20.04 installer set ashift for nvme when using zfs on root?

Does the 20.04 installer handle correctly setting ashift=13 (as appropriate) for zfs on root? If not, how to make it do so?
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Ubuntu eoan failure with grub-probe on ZFS root partition

new user here. I tried to install Ubuntu again after a long time and used ZFS as root partition to try it out. Have encountered some issues which manifest when installing software via apt: user@T440S:...
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ubuntu 20.04 with zfs unable to change kernel parameters

I have edited /etc/default/grub and changed GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" to GRUB_CMDLINE_LINUX_DEFAULT="intel_iommu=on mitigations=off" the run update-grub then looking at /boot/...
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New ubuntu 20.04 install, zfs on root — root and boot filling up

I've just installed Ubuntu 20.04 for zfs boot+root purposes. Every morning I've come to the workstation, it's exceedingly slow and unstable, and shows zero bytes free for / . Snapshots completely ...
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ZFS huge latency vs ext4

While testing Postgresql performance on a new machine under 20.04 server, I noticed very bad results when running postgresql inside a LXD container. LXD was running on a ZFS pool. I finally went back ...
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How to generate a grub2 menuentry with update-grub for an encrypted zfs root filesystem?

I'm running Ubuntu 18.04 on ZFS 0.8.4 and am playing around with encryption. I'd like to have a menuentry in grub that lets me boot to the encrypted root. System Setup A checkmark indicates that ...
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What are the zpool create -O file-system-property arguments used for?

The man zpool create page states -O file-system-property = value Sets the given file system properties in the root file system of the pool. See the Sx Properties section of zfs(8) for a list of ...
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Trying to extract files from ZFS image created by LXC

Alright, so on the beginning I’ll say that I’m not a master at Linux and that it is my first post here. If you’ll need me to do anything, I’ll do my best, but I can’t promise I’ll be successful. Also ...
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Using Ubuntu 20.04 with zfs, new install, how can I add a second drive to create a mirror (raid 1 ?)

Just installed 20.04 using ZFS on a system containing 2 1T HHDs. the installer creates 2 pools for /boot and for root. Unfortunately, the installer doesn't seem to know about raid or zraid. So how can ...
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What is the simplest way to backup a zfs file system to a second drive

When I upgraded to ubuntu 20.04 I started using zfs in my root file system. Until now I was using the program backuppc. Now that I have zfs root file system what is the best/simplest way to back up to ...
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How to stop ZFS?

So during installation, I decided to try out ZFS. Initially it looked good, but it is taking up way too much space on my 60 GB SSD. How do I stop snapshots and delete existing ones? I am using ubuntu ...
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146 views

ZFS rpool fails to mount on boot

My system was booting fine, but I was trying to resolve a couple ZFS related boot errors that said: cannot mount '/root': directory is not empty cannot mount '/var/cache': directory is not empty In ...
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ubuntu 20.04 can “ zfs-auto-snapshot” v.s. zsys

The package zfs-auto-snapshot is not installed by default. zsys is a minimally documented/incomplete snapshot management, which is the default. In particular it is unclear how and when snapshots are ...
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My server is eating up ram usage

For some reason my storageserver is always eating up ram usage but only to a limited point not where it gets critical to my eyes. my storageserver is a self made server using an intel xeon e5-1620 ...
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zfs legacy mounts on Ubuntu 18.04

I'm using zfs on a generic Ubuntu 18.04 system. Everything works fine when creating and mounting file systems using normal mountpoints. However, I have a use case that would be helped if I could use ...
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Disable Zsys Snapshots

How can I disable automatic zfs snapshots on Ubuntu 20.04? zsys seems to create snapshots but doesn't remove them anymore, which causes my system to run out of disk space.
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Why does Ubuntu 20.04 on ZFS destroy custom datasets at boot-time zpool import of the zpool.cache?

After creating the targets of a personal data lake, and filling them with plenty of terabytes through rsync, I was quite surprised at the next reboot, that Ubuntu's ZFS didn't like the datasets, and ...
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Ubuntu 20.04 zsys snapshot management unclear

I have been looking for any useful documentation for zsys. In particular. I'd like to know if there is a policy for removing old snapshots and if there is a way to tweak it. I'd like to know ...
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Upgrade from 19.04 to 19.10 problem

I have Ubuntu 19.04 root on zfs. When attempting to upgrade to 19.10 I run into an issue described here. The solution according to here is to replace initrd_device=$(${grub_probe} --target=device "...
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Is it safe to `zfs snapshot` my entire boot drive from root down?

Can ZFS be used like a virtual machine snapshot? Using, say, VirtualBox or VMM, I can snapshot a non-running VM before running and installing new software on it, and always revert back to a working ...
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Ubuntu 20.04 with ZFS Rpool have hundreds of Cloned filesystems

I have installed the new Ubuntu 20.04 on my server using the ZFS setup. All is working well, but I see some strange things. zsys-gc and zsys-commit services are marked as failed with this error ...
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Install Ubuntu 20.04 on ZFS partition

I read that I can install now Ubuntu 20.04 using ZFS. Unfortunatly I see this option only available if I wipe the complete drive. Thats bad, I want to dual boot with Windows and I don't want to loose ...
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How can I shrink a zfs volume on ubuntu 18.04?

Given an installation on a single disk with zfs, how can I shrink the zfs partition/pool so that I can add a new partition to the disk? Other instructions I've seen indicate setting the volsize ...
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Will the 19.10 to 20.04 upgrade path convert the file system to zfs?

I've read that one new feature of 20.04 is ZFS: https://www.zdnet.com/article/ubuntu-20-04-arrives-with-linux-5-4-kernel-and-wireguard-vpn/ Will the upgrade path also turn existing ext4 file systems ...
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Installing Ubuntu with LVM/ZFS

I don't think I have actually used Ubuntu since I believe Dapper Drake but looking to give it a go now that 20.04 has been released. I'm having issues with the installation process. I have managed to ...
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Unable to upgrade zfsutils-linux on 20.04

So. I'm stuck. This is recent installation of Ubuntu 20.04. All disks are setup as ZFS filesystems. ⚡ root@docker /var zpool list NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP ...
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Is it safe to upgrade Ubuntu 18.04 with ROOT partition installed on ZFS to 20.04?

When installing my Ubuntu 18.04 LTS I followed this OpenZFS guide https://github.com/openzfs/zfs/wiki/Ubuntu-18.04-Root-on-ZFS to install root on ZFS. All went well and my server has been running this ...
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Is ZFS on Ubuntu 20.04 using a ton of memory?

I have 64GB installed but htop shows 20GB in use: Running ps aux | awk '{print $6/1024 " MB\t\t" $11}' | sort -n gives me the largest processes using only a few 100 megabytes and adding up the ...
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Ubuntu fails to boot on Dell XPS 15 (7590)

I have tried this procedure w/ 18.04, 19.10, and 20.04 (Beta). I am installing w/ Root on ZFS, using: https://github.com/openzfs/zfs/wiki/Ubuntu-18.04-Root-on-ZFS I wiped the entire disk (using ...
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How to avoid `zpool import` every time I restarted ubuntu 19.10?

I created a mirror pool on two HDDs with sudo zpool create tank mirror /dev/sda /dev/sdb. After that I can access /tank. But everytime I restarted ubuntu. /tank will be an empty folder. I have to run ...
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What does this icon in Disk Utility mean?

As shown in the screenshot, there are strange icons on two seagate HDD. What does it mean? This is on Ubuntu 19.10 with zfs enabled.
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Recovering a borked GRUB with a Ubuntu 19.10 ZFS root filesystem

After a series of mishaps with Secure Boot (trying to sign VMWare Player kernel modules), GRUB stopped showing the entries corresponding to Ubuntu 19.10, installed as ZFS root (default 19.10 installer ...
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How to format an external disk to ZFS

I am on ubuntu 19.10 and have a brand new external usb disk (WD 14Tb Elements). I would like to try the ZFS and format the disk. Where would one start as I understand that Ubuntu is experimenting with ...
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Deleting zfs.img file in Ubuntu 16.04

Under Ubuntu 16.04, is it safe to delete the file /var/lib/lxd/zfs.img that is taking up 10 Gb of space knowing that I am using lxd containers but only with the DIR storage backend and never used ZFS ...

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