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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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ZFS: i/o error - all block copies unavailable -zpool unavailable

A server restart produced this output on the console: ZFS: i/o error - all block copies unavailable ZFS: failed to read pool zroot directory object qptzfsboot: failed to mount default pool zroot FreeBSD/x86 boot ZFS: i/o error - all block copies…
James B. Byrne
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Recover/move ZFS pool to a new server

I have a Ubuntu server set up with a 14-disk ZFS raidz2 pool. My boot device has become corrupted and I'm not able to mount its file system from a recovery live CD, so I will need to reinstall Ubuntu on a new boot drive and bring back my ZFS…
David Chappelle
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What is a recommended way of thransferring am iocage jail from one host to another

Source iocage thick jail running on FreeBSD-12.0p12 Destination FreeBSD-12.1p1 Both hosts are using zfs. What is the recommended method to transfer an existing iocage thick jail from the source to the destination? Is it as simple as: rsync -aqz -e…
James B. Byrne
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No files after zfs send receive

I've ran zfs send -Rv old_pool@snapshot_20190106 | zfs receive -Fd new_pool, but there are no files created in new_pool after the transfer finished. I've tried the same command in a VM (fresh install) and the files are there, copied over to…
Shira Ishikawa
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Is DL360 G8 w/ P822 w/ internal 12x3,5" cage suitable for ZFS backup machine?

I know there was similiar post but it was more about external disc enclosure. Smart Array P822 with HBA Mode? I would like to use internal 12x3,5" cage of the DL360g8. If P822 8i RAID card in HBA a mode connected to the expander of the cage, which…
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Any benefits of ZFS over EXT4 for data stream processing on top of HDFS?

I'm working on a data stream processing project in which i will be using Apache Flink and Apache Spark and I want to use HDFS for storage. The development and testing will be done on a single node cluster with multiple physical disks. I have already…
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Has anyone ever considered using a second partition on a disk in a ZFS mirror when that disk is known to be faster (SATA+NVMe)?

I was reading this question where I felt obligated to comment and poison the sanity of system administrators everywhere. Then I had an interesting idea. Lets say that you have a laptop with a one SATA and one NVMe interface. The only way to achieve…
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ZFS Recover from 2 dead drives on Raidz1-0

I've got a ZFS pool I'm trying to import to a new install, and I have what looks like 2 dead drives out of 4. Considering I have no back up (I know, this array was my backups) is there a chance of recovering from this? See below for zfs import from…
Phill
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importing ZFS pool from mirror child

I created a ZFS mirror from two disks. Then, without exporting the created pool I moved one of the disks to another system. How can I get back the data from that mirror child on a different system? I used the zdb command to get information about the…
Yassine Fadhlaoui
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Cannot re-add cache device to zpool

I have a cache device that fell out of the zfs array because of errors. Im pretty sure it was something i did - messing with cabling or something. It checks out fine, plus its just a cache device. When i try to readd it, it fails with the…
Devnull
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Solaris 11 - Extend/Grow ZFS Pool

At present, we have a Solaris server which is using ZFS as storage for the zones. The storage is presented from a SAN via LUNs. I have a zpool that is 500gb in size (provisioned from a 500gb LUN from the SAN). I want to make this zpool 1000gb in…
Banana
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FreeNAS too many errors on disk

One disk of my FreeNAS has failed, the zpool only contains a virtual machine. When I call zpool status -v, I get: root@freenas:/ # zpool status -v pool: freenas-boot state: ONLINE scan: scrub repaired 0 in 0 days 00:02:08 with 0 errors on Fri…
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LXD + ZFS on one-disc systems

I'd like to experiment with LXD on a dedicated NUC. Among other options, LXD supports ZFS. But I have the following questions: Case 1: Assume my NUC has one disc, say 256 GB, that supports the OS. Can I use this? If so, how should I configure it?…
Lloyd R. Prentice
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Does (when?) OpenSolaris support ZFS deduplication and l2arc

Deduplication and L2ARC in ZFS would be nice to have. Does OpenSolaris support them? I can't quite figure out which version of Solaris they are in, and how that maps to OpenSolaris. Are they there? If not, do you know when they are scheduled.
Brian Carlton
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Installing a WD Red NAS drive on a bare metal Freebsd 11.2 machine with ZFS

WD Red NAS drives come with built in firmware (NASware 3.0). If the drive is not going to be used in a conventional NAS device, such as a Synology or FreeNAS machine, are there any special procedures required to install it on a bare metal Freebsd…
user393947
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