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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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Can you add two non-mirrored disks to a zfs pool?

Is there a way to do something like this? zpool create newpool raidz /dev/disk1 /dev/disk2 ( /dev/disk3 + /dev/disk4 ) Assuming disk1 and disk2 are larger, and disk3 and 4 are smaller. You can get the end result (presumably with a performance hit)…
James Moore
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Mitigating risk of Disk Failure + Some corruption?

So my understanding of one scenario that ZFS addresses is where a RAID5 drive fails, and then during a rebuild it encountered some corrupt blocks of data and thus cannot restore that data. From Googling around I don't see this failure scenario…
AaronLS
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Nexenta - unknown trap type 8 in user mode

I'm trying to install NexentaStor 3.1.4.1 on Ubuntu 12.04 LTS KVM on AMD64 platform. During the install I encounter the following exception : "unknown trap type 8 in user mode" Can anyone point me what can be the issue ? Thanks.
user175100
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ZFS import pool ahcich0: timeout (NanoBSD 8.2 -> 9.1)

Many times when I had to make changes to the system, I boot from the USB drive to the new build NanoBSD then import the pool to the system. In the transition from 8.2 to 9.1, I do the same - boot from the USB drive new build NanoBSD 9.1. When I…
Allan Sundry
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Netatalk 3.0.1 disconnects with Bad file descriptor on FreeBSD

I am having trouble with my netatalk server 3.0.1 on FreeBSD-9.1 RELEASE. Netatalk was installed from the ports collection and is sharing some directories over the network. Update also netatalk version 3.0.2 has the same problems on my…
GorillaPatch
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How to mount zfs pools created on a different disk

I Upgraded my kernel and the driver letter changed so I lost my zfs disks (this is a test system). So I wanted to know how to recover them.
kkron
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raidz plus mirror on the same disk different slice in 2 pools

I need a little assistance. I have 6 2TB disks. I'm planning to assign approximately 500GB to my root pool slice 0 mirrored with another disk, since one disk isn't used up I then decided to do a raidz pool with 5 of the disks including the left over…
user156594
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Migrating data from software raid mirror to ZFS mirror

With a setup with two disk is there a way to migrate from software RAID1 to ZFS mirror ? This kind of procedure would be inspired by the migration that is possible from a disk stored on a single drive to software RAID1 : setup the software RAID in…
Arthur Lutz
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zfs pool error, how to determine which drive failed in the past

I had been copying data from my pool so that I could rebuild it with a different version so that I could go away from solaris 11 and to one that is portable between freebsd/openindia etc. it was copying at 20mb a sec the other day which is about…
Kendrick
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How to find maximal value for "zfs set quota" without changing quota?

How do I find out how far I can go extending the quota on a ZFS file system (Solaris 10)? I was told to set zfs set quota=none and then set it back to the original value, but I'm not allowed to do it. Is there any other way to find out what is the…
Pavel
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ZFS terminology: does 'root file system' accurately describe the file system at the root of a pool?

I began using the expression root file system. Recently in search engines I see, that three-word expression has different interpretations in relation to ZFS. To avoid future misunderstandings: if not 'root file system' (the first answer below),…
Graham Perrin
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Zpool list showing blank values

My problem is that when I call zpool list it gives this blank output.... NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT - - - - - - - - However a zfs list shows that syspool is imported NAME …
Awalias
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ZFS Pool (Raidz2) of 23 disks + 1 spare. Good/Bad?

I'm creating ONE Raidz2 Pool with 23 drives and a hot spare. (I know the hot spare isn't fully supported yet but thats fine) Is it a bad idea to use this many disks in a single pool? What would the consequences be if I did do this?
David Vasandani
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zfs mix raid levels in one pool

I've read that "It is not recommended that RAID types be mixed in a pool", which implies that it is possible. Why is it not recommended? It would be very desirable in my setup, which consists of a mix of very-important, important and not important…
Adam Ryczkowski
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NAS4Free disk encryption and ZFS error

I have installed a NAS4Free on a VM, and as recommended, I installed it on a 1GB virtual disk, and assigned another disk 500GB to this VM for file storage. I have created the disk, encrypted it, created a ZFS virtual disk, and then a ZFS storage…
Mentor
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