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

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how to check if zfs is using the kernel module

I am having perfomance troubles (transfer rates only about 50MB/s using 6 2TB server hdds WDC WD2003FYYS, each doing app 150 MB/s) with my raidz and was hoping to increase it with the ZFS on Linux ...
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ZFS - Always Out of Memory

I read that ZFS was set to use all physical memory except 1GB on systems that have 4GB or more. Since I have virtual machines running my home-server that is running the ZFS filesystem, I wanted to ...
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33 views

Moving From FreeNAS to Ubuntu Server

So I've just bought and installed an HP Proliant Microserver gen8 and upgraded it to 10GB RAM. I've installed FreeNAS onto a USB key (16GB) as recommended and FreeNAS is working well. Unfortunately, I ...
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2answers
29 views

How much space is required for snapshots in ZFS?

How much space do snapshots use in ZFS? I created a pool and want to create a volume. I don't know how much space snapshots will occupy. Is there any way or formula exist to compute space ...
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114 views

Import ZFS Pool from FreeNAS (not supported com.delphix:embedded_data)

I am trying to import a pool that I exported from FreeNAS. I originally installed zfs-fuse however it was not a new enough version. I removed that and installed ubuntu-zfs from the PPA. Here is an ...
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33 views

Understanding the zfs boot services with systemd on Ubuntu

I would like to understand exactly how zfs is being initiated at boot running systemd on Ubuntu. Although the system boots fine it appears not all zfs filesystems automount, and zpools need to be ...
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62 views

ZFS on Linux “no such device in pool”

I have a pool which contains a disc with only a few errors. I wanted to clear those errors out and see if they came back before I purchased a new disc: me@server:/$ sudo zpool status tank pool: ...
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20 views

ZFS: How does it work? Mirroring on Raid0

I've got a laptop, that I want to migrate to ZFS filesystem. This laptop has 2HDD Drives. My zpool idea is like this: 1 zpool on 2 HDD drives. / - separate subvol /home - separate subvol with ...
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88 views

How to blacklist zfs kernel module during boot?

How to disable ZFS kernel-module before boot in grub? It is mentioned that some modules can be disabled through grub command line in similar question. Unfortunately this method is not working with ...
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2answers
134 views

grub can't find grub.cfg when booting from zfs root

I installed Xubuntu 14.04 on a ZFS-root following these instructions using ZoL's Debian repo: https://github.com/fajarnugraha/pkg-zfs/wiki/HOWTO-install-Ubuntu-to-a-Native-ZFS-Root-Filesystem The ...
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1answer
89 views

cgroups disk IO throttling with zfs

I'd like to use cgroups with my linux containers to throttle disk IO on them. Containers placed on ZFS volume /tank/lxc. I have three containers each in their own /tank/lxc/nodeXX directory. How can ...
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1answer
82 views

Can I import a ZFS data pool from FreeNAS without losing the data?

I'm switching to Ubuntu server from FreeNAS and I don't have a hard drive to back the data up to. Is is possible to import it into Ubuntu even though the data pool is split between two different HDD?
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77 views

ZFS pool import broken after upgrade

I lost my zfs pool while migrating from 12.04 to 14.04. > sudo zpool status pool: srv state: UNAVAIL status: One or more devices could not be used because the label is missing or invalid. There ...
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1answer
94 views

zpool missing after kernel upgrade attempt

I'm running 14.04 LTS with ZFS and tried to update my kernel to 3.17 following these instructions. During this install I got this error: *** Please make sure the kmod spl devel <kernel> ...
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1answer
303 views

What happens in bcache if the cache ssd dies?

I'm creating a NAS and I've been doing a lot of research on the different SSD caches. I have a 120gb ssd which is more than enough for the OS so I want to use most of it as a cache for the md raid5 ...
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59 views

zpool will not mount after upgrade to 14.4

After upgrading my Ubuntu to 14.04 my server wouldn't complete boot. Hooking it up to a monitor I see that it failed to export my zfs and that by pressing the "s" key, I could bypass that. Doing so, ...
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126 views

zfs mountall does not work at boot on Ubuntu 14.04 LTS

I'm not sure how do I go about debugging this. I have the following packages installed - ii dkms 2.2.0.3-1.1ubuntu5+zfs9~trusty ...
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Failed to load ZFS module stack

Have been using zfs on linux (zfs-native/stable) raidz on 14.04 for several months without hitch and decided to move across some more important files as considered it trustworthy or I guess "stable" ...
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324 views

How to make update-grub recognize zfs datasets as root in /etc/fstab and add minimal set of zfs options?

I'm having trouble to find out how to make update-grub of grub-efi 2.02~beta2-9ubuntu1 recognize the specification of a ZFS dataset as root device in /etc/fstab and conditionally add a minimal set of ...
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37 views

How to recover a GPT after wrong zpool creation?

I run zpool create /dev/sda instead of zpool create /dev/sdaX. The command failed after ~2 seconds with an error I can't reconstruct or remember. I guess if I had sent SIGINT to zpool it would have ...
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1answer
367 views

Mounting ZFS pool - almost there

I'm having a bit of trouble mounting an ZFS pool I've migrated from a FreeNas system to Ubuntu 14.04. So far I've managed to import the ZFS pool via the zpool import Storage command. I can list all ...
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430 views

How to migrate from ext4 to zfs root filesystem with separate ext4 boot partition?

I'm trying to change my root partition from ext4 to zfs (simple partition, without ZFS volume management functions) by moving all files in a live system (Ubtunu 14.04) from the ext4 partition to an ...
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I cn see 'zfs partition' through the 'disks' app, but there is no option to mount. Details

The Case: I have a notebook with a partitioned HD. I installed Debian in one partition, and the other partition was destined to "/home". About a month ago, the "/home" partition was corrupted, but ...
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1answer
930 views

ZFS pool broken after upgrading to 14.04 LTS

Well, I have been putting off upgrading to 14.04 for fear that I would break something. Actually for fear that it would break zfs (or I would break it). I am bascially slightly better than novice ...
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154 views

Building NAS Server and Need Guidance

I'm building a NAS and using Ubuntu as the OS. I have a few questions and need some guidance on what direction to take. I know I am asking many questions, if you can only answer one of them please ...
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1answer
78 views

ZFS Pool - in dire need of help.

I'm really really new to Ubuntu. Which is probably why I'm facing this predicament... I couldn't load Ubuntu this evening. For whatever reason I could get to the login screen, but absolutely no ...
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1answer
338 views

How to manage kernel upgrades with ubuntu-zfs installed

I have ubuntu-zfs installed. Periodically my system downloads minor kernel updates, but does not rebuild the ZFS module. On the next reboot, none of the ZFS filesystems can be mounted. In the past ...
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247 views

How to mount ZFS drive on Ubuntu?

A friend of mine asked me to back up his drive, but its file system is ZFS. I would like to know how can I mount that on Ubuntu. Thanks.
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1answer
947 views

Booting off a ZFS root in 14.04

I've been running a Debian derivative (LMDE) on a ZFS root for half a year now. It was created by cloning a regular ext4-based install with all the necessary packages onto a ZFS pool, chrooting into ...
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359 views

apt-get in LXC container is very slow on Ubuntu Server 12.04

I haven't had much luck in finding out the source of the issue, whether this "issue" is simply a limitation of LXC or zfs, or whether this issue is specific to Ubuntu. The issue is quite simply that ...
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1answer
1k views

ZFS on Linux: Setting up NFS on Ubuntu 14.04

I upgraded my headless server from 13.10 to 14.04, but borked the upgrade (and stupidly didn't have a backup image - lesson learnt). Hence, I'm reinstalling everything from scratch. I have a working ...
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ZFS on Linux: Setting up NFS on Ubuntu 14.04 with OS X Mavericks Client

I have a working zpool and dataset set on my home server. I want to setup NFS to access ZFS over my home network on my Mac. On the Ubuntu side, I have... # apt-get install nfs-kernel-server # zfs ...
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1answer
166 views

Cannot boot ZFS root on Ubuntu 12.04 after Heartbleed update

I did the apt-get update and then upgrade to deal with the heartbleed vulnerability. I rebooted after the upgrade without checking that everything was good. Now I'm not having much luck. It is booting ...
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1answer
150 views

ZFS mirror with two partitions on the same disk, safe?

I would like to create mirrored partitions on a single disk to protect against bit rot. I understand this will not protect against hardware failure. Seeing as ZFS is intended to work with drives, ...
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3answers
3k views

Error when installing ubuntu-zfs

I'm switching from FreeNAS to Ubuntu 12.04 LTS. After a vanilla install of Ubuntu has been completed I run the following commands in the order shown to install ZFS: apt-get install ...
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Which is better for a home media server: zfs or btrfs or LVM/md? [closed]

I'm looking at building a new home server and would like a flexible filesystem. Both btrfs and zfs are interesting. I want to be able to do soft raid and have flexible solution allowing me to expand ...
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1answer
562 views

Home Microserver using Ubuntu and ZFS: about ZFS

I see this topic is quite a popular ([1], [2]) so hopefully I can get nice feedback on what I'm trying to do. I'm buying an HP Microserver with 4x 2TB, and I currently have two computers. I'd like ...
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zpools don't automatically mount after boot

Running ubuntu 13.10 server. Installed and setup zfs from the ubuntu ppa. All appears to work fine after a reboot if I manaully do a 'sudo zfs mount -a', but reading the FAQ on zfsonlinux.org it ...
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2k views

ZFS: Help importing a zpool after Ubuntu upgrade from 13.04 to 13.10, device IDs have changed

I have updated Ubuntu from version 13.04 to version 13.10, only to discover that the SATA disks IDs have changed, and my ZFS pool now fails. On new Ubuntu 13.10 the disk IDs are now ata-* instead of ...
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1answer
686 views

ZFS pool with disks labels /dev/disk/by-id/scsi*** disappeared after upgrade

Recently I have upgraded my home server from 13.04 to 13.10 by dist-upgrade and my zfs pool which was built using .../by-id/scsi*** disk names broke The problem is that scsi*** labels completely ...
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1answer
1k views

Unable to install ZFS (Ubuntu 13.10) [closed]

I'm fairly new to Ubuntu and wanted to setup a server running ZFS/XBMC - The XBMC install went fine, however I ran into trouble getting ZFS working. Configuration : Ubuntu 13.10 (GNU/Linux ...
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808 views

ZFS RAIDZ Pool appears empty after upgrade to 13.10

I upgraded my Ubuntu workstation where I had my home directory linked to a ZFS filesystem. After the upgrade, I can no longer log into the desktop, but I can log in via terminal. When I browse to ...
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1answer
443 views

zpool 'replace' vdev failed after resilvering - can't detach

My one zpool has experienced two successive drive failures. As I was resilvering the first, the second failed and I got two errors, in snapshots. The resilvering finished, and then I used "zpool ...
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1answer
2k views

Activate ACL for zfs pool ubuntu 13.04

i have tested ACL on local folders and i works perfect. But on my zfs pool called "tank" root@datacenter:/mnt# ls datatank test webmin_1.650_all.deb root@datacenter:/mnt# setfacl -m u:casper:rwx ...
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ZFS on >2TB disk in Ubuntu 12.04?

I just got a 4TB disk and I'm running Ubuntu 12.04. http://www.thegeekstuff.com/2012/08/2tb-gtp-parted/ says you need to partition your disk with GPT if you want to use >2TB (and that you can do this ...
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2answers
166 views

use Cron to mail log from a job

I have a weekly script that cron runs to make a zfs snapshot. I was wondering if it is possible to mail a OK mail if the job run correctly and a error mail if something happened and in the content of ...
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142 views

ZFS Raid1-z replace Disk

I inted one of my disk from the lower raid1z setup and i was wondering what is the best way to do it, what a re the steps. NAME STATE READ WRITE CKSUM ...
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3answers
2k views

Activate ZFS Snapshots

I accidentally delete some files from my zfs pool and tried to mount the latest snapshots but i just figured out that i have no snapshots. How to activate the snapshots, how to configure it? I am ...
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2answers
308 views

Which file system supports RAID and is mature enough for a media server?

I am planning on setting up a home media machine with Ubuntu 12.04 LTS or 13.04 (please let me know if this makes a difference). I have 4 hard drives and I am looking for a file system that supports ...
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3answers
8k views

Replacing a dead disk in a zpool

I'm running Ubuntu Server 13.04 64-bit using native ZFS. I have a zpool consisting of 4 hard drives of which one died yesterday and now is not being recognized by the OS or the BIOS anymore. ...