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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 2.0: How can I lower CPU-load on write with very slow disks and weak CPU?

I have a small 32bit-ARM-based board with three disk attached via USB 2.0. This has been running fine with ZFS 0.7.1 and 0.6.x for a long time, and I do not mind the reduced disk performance. (I am using ZFS elsewhere, I like to have this…
Martin
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ZFS raidz3 on proxmox having IO issues

I'm running Proxmox 6.2-11 with 256GB ECC RAM and the following raidz3 pool: pool: rpool state: ONLINE scan: scrub repaired 0B in 0 days 15:25:14 with 0 errors on Sun Jan 10 15:49:29 2021 config: NAME STATE READ WRITE CKSUM rpool ONLINE 0 0…
Stanimir Stoyanov
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In running iSCSI, Disk I/O get worse when default gateway is connected

The server has been running iSCSI service for the diskless client, and I have noticed that the connection of server's gateway(internet connection or a fake gateway) made iSCSI performance worse. Is there anybody who has experienced this OR who could…
sohnman
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How to easily give all available space for "zfs create -V" command?

I need to create an ext4 fs over a zpool. I wanted to use all (or almost all) available space, as shown below. # zpool list NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT nat2012 1,81T 124K 1,81T -…
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file shared on SMB on zfs on linux cannot be read over network

The file can be opened locally. I think the problem is related to attributes or permissions somehow, but I do not know how to check them. The files are GoPro videos in a particular directory, and originally were saved onto my MacBook. I transferred…
Steven Lu
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Cannot see the right and used space on a ZFS dataset

I have set up a vm with debian buster and ZFS. Initially the machine booted from first hard drive, but added x4 20Gb hd and transfered the system to zfs for testing purposes. It works, so I added some datasets to see how it grows. But when querying…
ppk
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ZFS entering D-State at random

I am running ZFS on Ubuntu 20.04 LTS ontop of hyper-v. At random, currently every 2-3 days, ZFS gets stuck. Samba is non-responsive, File I/O via smb to the ZFS volume ceases and actions on the shell on the volume makes the shell freeze. Ubuntu is…
user3829915
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Similar ZFS performance on HDD and SSD

I've created two zfs pools (one with ssds, the other rust) and run bonnie against each to try to understand their performance but I find the output somewhat confusing as the performance seems practically identical. I was wondering if I'm…
James
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Is using mbuffer safe on a public network for zfs send raw encrypted data?

I use ZFS send and receive to send incremental snapshots of an encrypted dataset in raw mode over SSH to a backup server using mbuffer over the internet. Using this strategy the transferspeed increases greatly. Only using a 10 year old Core 2 Duo, I…
Crestop
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ZFS send/receive fails consistently with "Input/output error"

I have a ZFS disk with deduplication turned on. I have copied data from many other old hard disks onto this ZFS disk, ultimately with the intention of getting rid of all the original disks. I need to make a backup copy of the ZFS disk though, but…
Pryo
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Barman: rsync wal archival stalls on some files

I'm archiving wal files from a postgres server via rsync, most of the time the archiving works fine and is quick, the speedtest for the connection is here: (this goes via the internet) [ ID] Interval Transfer Bandwidth Retr …
Thoro
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Remove a ZFS attribute instead of setting its value to default?

I added a ZFS property which was not included by default. Instead of setting it back to true (default value), is there a way to "remove" the attribute I created? root@library:~# zfs get all | grep false library/secure com.sun:auto-snapshot …
ensnare
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With a ZFS root install, which partitions need to be `canmount=noauto` and why?

With a ZFS root install, which partitions need to be canmount=noauto and why? I am looking at a fresh installation of Ubuntu 20.04 with ZFS on root. I am using these instructions on the openzfs site, but there is one thing that I don't get which is…
Stonecraft
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Which docker storage driver for new server with NVMe drives?

I am building new server for GitLab CI jobs. Currently we already have one home-made. It's using classic HDDs + SSDs for caching so I chose ZFS storage driver which is not performing optimally. New server will consist only of two NVMe SSDs so I…
user3063800
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Dell H730 in HBA mode - Why are there issues with performance and SMART data?

I recently purchased a Dell R730xd that came with an H730 RAID card. I would like to bring an existing 6 disk ZFS pool to this server as well as create an additional 6 disk hardware RAID. In my research, I have read that the H730 DOES support HBA…
TJ Zimmerman
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