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Questions tagged [zfs]

ZFS is a modern file system and volume manager originally developed by Sun Microsystems and licensed under the CDDL. It is a copy-on-write file system with support for large storage arrays, protection against corruption, snapshots, clones, compression, deduplication and NFSv4 ACLs. An open-source fork of ZFS can be found at http://open-zfs.org/ , which is supported by ZFSonlinux.org, illumos.org and ZFS developers in the FreeBSD & Mac OS X communities.

ZFS is supported out of the box on a number of operating systems:

  • Solaris 10
  • Oracle Solaris 11 Express
  • FreeBSD
  • NexentaStor
  • illumos - specifically, illumos-based distributions, like:
    • Nexenta's illumian
    • Joyent's SmartOS (server OS with strong focus on virtualization)
    • OmniTI's OmniOS (general purpose server OS)
    • OpenIndiana (general purpose desktop/server OS)

Due to license incompatibilities, the CDDL licensed ZFS code cannot be distributed as part of the GPL licensed Linux kernel. Other alternatives methods are available for running ZFS on Linux:

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Sun Storage Appliance (7110) loss OS

We have Sun Storage Appliance (7110) loss OS. We can not boot to ZFS Application: System update in progress. Updating from: ak/nas@2011.04.24.3.0,1-1.19 Updating to: ak/nas@2011.04.24.4.2,1-1.28 Cloning active datasets .cannot open…
Microwave
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DAS RAID Storage to FreeNAS

I have a RAIDdeluxe storage from RDL family with 42 HDDs inside that is connected to the Seupermicro server with FreeNAS installed on it. FreeNAS server has MegaRAID SAS 9380-8e card. I've read FreeNAS: A Worst Practices Guide for the FreeNAS and…
Sylca
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Unable to detect/mount zfs pool created on different machine

I'm trying to mount a zfs pool created on a different machine. To test out this scenario I have created two virtual machines in Virtualbox. The OS is Ubuntu 16.04.1 server in both cases. Machine1 has 5 virtual disks (one for the OS, the other four…
jules
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zfs remove device from pool

Before you read the title and roll your eyes, I've already read all of the various answers, posts, and articles that say you can't shrink a pool once you've made it. However, I saw this post which claims to do exactly that (i.e. remove a device from…
Ross Tajvar
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How to avoid long list of mountpoints for ZFS exported over NFS for multiple users?

We are running a cluster for about 50 user-groups mapped as Linux groups. Each group has a filesystem allocated from a ZFS storage server which is exported over NFS. This results in a long list of mountpoints that are required to be mounted over the…
Ketan Maheshwari
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How to reuse filesystem subtree amongst multiple jails?

I have a FreeBSD 11 host, and I want to setup multiple jails in it. Official guide suggests hard copying /usr/bin into each of the containers. Having that my jails shall be nearly identical, this seems wasteful for me. It would be nice if I could…
Tracey
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Is there a zpool configuration other than raidz2 which lets me survive ANY 2 out of 4 failures?

I am going to purchase a HP Microserver gen8 system for a home fileserver and it contains 4 drive bays. I will use those four drive bays to create a single zpool for mass storage. My goal is the ability to survive any two drive failures from that…
user227963
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ZFS :: bitrot (in checksum)

As far as I know, zfs uses checksums to protect against data loss caused by bitrot. But what happens if a bitrot affects the data of the checksum. Then, does zfs think the data is corrupt or think the checksum is corrupt? Thx 4 any answer, tbol
tbol
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ZFS: ARC and buffer cache with PostgreSQL

I am using Ubuntu Xenial, zfs and PostgreSQL 9.5 with all updates available atm. All testing is done on EC2 m4.xlarge (8GB RAM) and table size ~4GB. PostgreSQL effective_cache_size=6GB. First scenarion: primarycache=metadata, arc_max_size=1GB…
Vladimir
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ZFS Snapshot showing unreachable inside snapdir

I am using ZFS with Linux 3.19.0-58-generic. I have created some snapshots, but when I cd into these directories after one point it becomes unreachable, what does that mean ? Is there any workaround through which I can solve it.
Shilpi Agrawal
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Can the type of a previously created ZFS pool be changed?

I have a 2-drive zfs pool created in mirror mode. Now I've managed to get my hands on a third drive, and I was wondering if I could add the drive, and change the pool type to raidz, which is pretty much better for three disks.
Roberto Santalla
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zfs: dataset does not exist

I'm not able to set mountpoint to the pool. # zpool import pool: wd-black id: 18120690490361195109 state: ONLINE action: The pool can be imported using its name or numeric identifier. config: wd-black ONLINE …
Vaclav Kasal
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ZFS: i/o error - all block copies unavailable

I am trying to install FreeBSD Sparc64 on my SunFire440 machine, I followed the tutorials to Install FreeBSD Root on ZFS using this tutorial link. Only the changes I made is that instead of using mirror I tried configuring raidz1 with four internal…
Megamind
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Wrong permission when accessing ZFS snapshot over NFS (Solaris server, Ubuntu client)

TL;DR: I don't understand why I can access one file but not an other (in the same directory), although they appear to have identical permissions. I have an NFS server running Solaris 10 10/08 and a client on Ubuntu 12.04. I mount a ZFS snapshot…
Pavel
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ZFS vs WinFS compare

What are main pros and cons of ZFS and WinFS filesystems ?
m1k4
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