Questions tagged [zfs]

ZFS is a combined file system and logical volume manager designed by Sun Microsystems The features of ZFS include protection against data corruption, support for high storage capacities, efficient data compression, integration of the concepts of filesystem and volume management, snapshots and copy-on-write clones, continuous integrity checking and automatic repair, RAID-Z and native NFSv4 ACLs.. -Wikipedia

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741 views

FreeBSD: Samba eating memory

I have a freebsd file server root@vstorage:~ # freebsd-version 11.1-RELEASE-p1 Here's some additional info. root@vstorage:~ # dmesg | grep CPU: CPU: AMD Phenom(tm) 9750 Quad-Core Processor (2400....
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Zfs Replace - How to remove drives after replaced

I have a zfs Z2 (Raid 6 equivalent array) comprising 8 1Tb drives, that previously had been working well for a couple of years. Due to disk problems, I have had to replace at first one drive, then ...
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1answer
427 views

How to downgrade ZFS On Linux on CentOS

I need to do some testing of ZFS on CentOS 7.3 using the 0.6.5 branch, not the 0.7x branch. When I install using the ZoL site instructions for "zfs-release" package I only see listings for the 0.7x ...
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1answer
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Large archival storage laypout [closed]

I am playing with a though of buying into a large redundant storage for all the family data like old photos, causal backups and such. My primary question here is how to layout it so it is safe, ...
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1answer
997 views

How can I detect whether an “NMI watchdog: BUG: soft lockup” is a hardware or a software issue?

Soft Lockup dmesg reports in my laptop, since quite some time now, NMI watchdog: BUG: soft lockup every time I try to use updatedb or firefox. Samples of what is reported posted at https://github.com/...
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Does ZFS reads and writes show up in vmstat -p output

I am aware of ZFS not using the regular file system cache for caching pages for reads or writes (ZFS uses ARC and ZILs). My question is would "vmstat -p" on a recent Solaris machine also reflect read ...
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1answer
868 views

ZFS ARC memory tuning [closed]

Recently we are trying to tune ZFS on a machine which runs on 256RAM memory. Our current ZFS memory variables for the ARC are max 255Gb and min 64Mb. A main issue that we face is that during ...
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2answers
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DEGRADED zpool can't be imported with I/O error

I'm running a personal server at home with a CentOS 7 OS and a 12TB zpool. It's been running for a couple of years and yesterday I noticed some problems so I went in to have a look. At first it ...
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1answer
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ZFS: zpool import - UNAVAIL missing device

For about a year I had a debian server running with data on dm-crypt/ luks-encrypted hdds underneath zfs (pool name zdata), 8 hdds in a mirrored mode, so 4 mirrors with 2 hdds each. A zpool status ...
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1answer
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How to use SSD on ZFS-based system?

I understand ZFS uses / can be set up to use an SSD as L2ARC cache, ZIL, as well as host for a deduplication table. None of these appear to require a fixed minimum size (the deduplication table might,...
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1answer
214 views

Docker container on VM not writing to ZFS dataset

My setup is the following: Physical host with QEMU/KVM -> VM with Docker -> rtorrent Docker container I have a ZFS pool called "main" with a dataset called "data". The "data" dataset is mounted on ...
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Install zfs on debian 9 stretch

I tried to install zfs on debian 9.1, however I'm experiencing some errors. My first installation was only of zfs-dkms however I read on the net that also the spl-dkms is required for zfs-dkms to run....
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367 views

When mirroring a whole root zone rpool, do you have to install a boot block?

I am mirroring a zfs rpool for a whole root zone to move from one storage array to another. I have mirrored the disk, but do I need to install a boot block on the new disk?
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569 views

Does ZFS deduplicates across datasets or only inside a single dataset?

Does ZFS deduplicates across datasets or only inside a single dataset? In other words if I have two nearly identical volumes will they be deduplicated?
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1answer
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ZFS - “Add. Sense: Unrecovered read error - auto reallocate failed” in syslog, but SMART data looks OK

I have a zpool (3x 3TB Western Digital Red) that I scrub weekly for errors that comes up OK, but I have a recurring error in my syslog: Jul 23 14:00:41 server kernel: [1199443.374677] ata2.00: ...
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Can't install zfsutils-linux on newest Raspbian (July 2017)

Yesterday I installed the newest Raspbian on my SD card. Today I wanted to install all the packages needed for ZFSonLinux. First I installed spl-dkms, zfs-dkms, etc. Everything went fine. Then I ...
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Unkillable zombie parent

I sure wish I could kill the parents of these zombies (as seen below) and get on with life without rebooting. As I understand it, the unkillable D state is caused by an uninterruptable system call. ...
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1answer
3k views

Zfs on centos, can't create files?

I'm running centos7... have 4 x 3tb hdd's, so I installed zfs as it looks like the best solution. I installed and setup via root, but the local user can't seem to write files / folders. And google won'...
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Mount ZFS Pool as Internal Drive

I'm running Debian Jesse with Gnome 3. I've created a ZFS pool named Data and set its mount point to /media/[user]/Data. Below is a screenshot of my /media/[user] folder and the desktop showing how ...
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1answer
980 views

How to make nfs-kernel-server.service initialise when the only NFS exports are ZFS?

I have a number of ZFS file systems intended to be exported: $ sudo zfs get sharenfs NAME PROPERTY VALUE SOURCE zpool0 sharenfs ...
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4answers
2k views

Recover deleted file from ZFS snapshot (still viewable vith lsof)

I have a ZFS volume on a Linux Debian. A snapshot is took each night on this volume. For whatever reason, a big file (virtual disk) was deleted several days ago. This file is still in use (by kvm). ...
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1answer
249 views

Open ZFS : Recently Used/Frequently Used statistics persistence

ZFS cache data into ARC using two information : Recently Used Cache Frequently Used Cache Does ZFS keep this file/metadata statistic somewhere, or does it just do with what has been used since power ...
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1answer
168 views

Progress bar shows incorrect speed when copying files to nfs mounted storage

I have a strange problem with a nfs mounted drive. It's a zfs pool shared via nfs, both server and client use Linux Mint 18.1. What happens is that when I copy a larger file to the server, the ...
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Safe FreeBSD test on system running debian with zpools

So I bought a nice cheap used server in order to turn it into a file server + VM Host, every thing was neat in the prototype VM. But reality comes in, motherboard power control over fans is pretty ...
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2answers
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Recommendation for usb drive pool

I have a server with a large amount of storage. I also have a bunch of large USB drives that I would like to use as a backup volume. My question is, on Linux, is there any reliable way to do a ...
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1answer
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Cifs (samba) Share permission issue (unix + zfs)

I want to give Share permission to my cifs share but I guess unix only able to give file permission like: /usr/bin/chmod -R A+group@:full_set:fd:allow pool/test This is the bad way because I ...
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1answer
443 views

Mapping ZFS pool to partition

I have two ZFS mount points/a ZFS pool in a FreeBSD 12.0 server, that I can see with df: $ df -h | grep zroot zroot/vms 196G 657M 195G 0% /vms zroot 195G 19K 195G ...
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virt-manager permission denied when trying to access .img file on zfs pool

using fedora 25 I can create, but not access (i.e. vm's use) .img files sitting on my zfs pool note: using zfs-fuse (regular zfs will not work on fedora). I was able to get this working using zfs-...
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2answers
120 views

ZFS Pools Nestable?

Coming from Gentoo, I'm still used to partitions, and Logical Volume Management. Having just installed and updated FreeBSD-11-RELEASE, using an entire 500GB disk, like so: % sudo zpool list ...
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2answers
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Reliability of ZFS/ ext4 on ZVOL, used not for performance but for transparent compression, on low memory system?

I have read many controversal statements about ZFS on low memory systems on the internet, but most of the use cases was for performant data storage. I want to use ZFS not for performance reasons, but ...
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1answer
295 views

setting a quota on zfs doesn't work

I'm on FreeBSD 11. In order to set quota on my pool named storage, I enter these configs in terminal: zfs set quota=10G storage zfs set userquota@user1=1M storage The problem is when I connect from ...
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lxc - should zfs-backed container have their rootfs unmounted after being stopped?

I'm using lxc and zfs on Ubuntu 16.04. When I stop a container, the zfs /lxc/containername/rootfs volume is left mounted. Should stopping a container unmount its storage? Do mounted zfs filesystems ...
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1answer
2k views

bash: zpool: command not found

After a lot of hassle, I finally managed to install the newest spl-dkms and zfs-dkms on my Raspbian. Sadly I still can neither use the zpool nor the zfs command to list or change any ZFS pools. Is ...
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1answer
5k views

With ZFS on Linux, how do I list device (vdev) specific properties?

I am using ZFS since a while now without problems. I am still excited about it, and I highly trust it. But from time to time, new questions come to my mind (in particular after having read some ...
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2answers
675 views

ZFS pool for both common use and LXD, will it work?

I have 2 disks and would like to create one ZFS raid0 pool on Ubuntu 16.04 for everyday use and to keep LXC containers on it. Will it be ok to manage this pool by myself and allow LXD to manage it at ...
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1answer
848 views

How change type of hard disk with the format command of SOLARIS

I would like to change the type of disk form : 15. c2t15d0 <Sun-STK RAID INT-V1.0 cyl 36417 alt 2 hd 255 sec 63> /pci@0,0/pci10de,375@f/pci108e,286@0/disk@f,0 to 15. c2t15d0 <...
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1answer
426 views

How to restore a hardlinked file

I have a filesystem with a series of date stamped archival backups of another filesystem. The backup uses hardlinks to copy only the delta between consecutive archival instances. The drive has had ...
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0answers
135 views

Wrong service startup order when not booting into single-user mode

I'm asking about a Debian Wheezy system running sysvinit and ZFS on Linux. While my problem manifests itself with ZFS, I strongly suspect that the underlying problem is not ZFS-specific. For some ...
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1answer
640 views

FreeBSD encrypted zfs mirror - replace failing drive, including encrypted swap

I have a FreeBSD 11 machine which has three physical drives in a ZFS mirror, encrypted with GELI. All of this was basically magically set up by the FreeBSD installer when I first built the machine, ...
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1answer
2k views

ZFS Ubuntu 16.04 Replace drive with itself

I'm new to the ZFS filesystem. I was using a DrivePool in windows, but I wanted something that would correct errors on the fly as well as create and maintain snapshots. I was using BTRFS at one time; ...
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Do I format the zfs file-system, or just mount and share?

I have a zpool, with some datasets, mounted to this zpool. The zpool was created by specifying zpool create criteria, using 6 drives as a raidz2. Once the datasets are created using zfs create I ...
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1answer
250 views

Help fixing problem drive

I have a 3TB WD drive that had a ZFS pool with another drive making a single 6TB partition. That other drive failed and corrupted the data on this drive, I am trying to recover this drive, not the ...
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2answers
515 views

Can't delete file from samba share + Solaris + ZFS

My disk storage running on Solaris + ZFS and i can't delete a file from my cifs share. I tried from Windows + Solaris nothing works... I was thinking someone is using the file and i close my cifs ...
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1answer
6k views

ZFS on Linux send/receive resume on poor/bad ssh connection

I am using ZFS on Linux, and trying to setup remote replication. But I have bad ssh connection, and zfs send/receive over ssh restarts again. I know there is a issue on ZoL, but I don't know when it ...
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2answers
1k views

ZFS on Linux snapshot recursively volume and subvolumes

I am using ZFS on Linux, and have some question regarding snapshots. I have following structure mypool/HOME mounts /home mypool/HOME/root mounts /root mypool/ROOT mounts none mypool/ROOT/rootfs ...
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0answers
281 views

Account for missing space as reported by ZFS list

This is a question regarding the available space as reported by zfs list that does not meet user expectations. I have looked at similar questions, but I still don't understand the zfs list output. Let ...
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1answer
406 views

ZFS Send to Pigz, to netcat

I am writing a script that opens a netcat process remotely on a server which listens for input and redirects it to a file: ssh $remote_upload_user@remote_upload_address "nc -l -p $remote_port > $...
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0answers
932 views

Why ZFS scrub does not complete?

First off let's start with what I'm running. This is a home media server running Ubuntu 16.10. I have one pool of mirrored 6 terabyte drives that are about half full. I built the system about a month ...
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1answer
1k views

How do I automatically import a non-root encrypted ZFS pool on boot-up?

I’m running an updated version of Arch Linux with the stock kernel, version 4.9.6, and ZoL version 0.7.0, and I want to import an encrypted non-root pool on boot. The pool is a raid 1 mirror. The ...
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1answer
79 views

Any way to make a drive(ZFS) unbootable?

Lets say you can't access the bios to change the boot order of a drive, How would you go about booting from a particular drive. Is it possible to make every other drive 'unbootable' and thus making ...

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