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.

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29 views

arch linux on zfs root cannot configure grub on bios

as the title suggests I cannot get across the finish line installing arch on zfs. I get to the point where I try and install grub on my /boot after chrooting into my /mnt from the live cd. anyway ...
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1answer
49 views

Can UNAVAIL zfs be recovered?

My zfs pool is UNAVAIL and cannot be imported. I wonder if there would be any possibility that it is recovered or I can take out any data from it? Background I took over management of a server that ...
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How to explain these fio bandwidth results?

Been running a couple of fio tests on a new server with the following setup: 1x Samsung PM981a 512GB M.2 NVMe drive. Proxmox installed with ZFS on root. 1x VM with 30GB space created and Debian 10 ...
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zfs miror with 2 TB drives of slightly different size

I have an old 2TB Seagate Barracuda drive and I want to build a zfs mirror. I don't think I can buy a 2TB drive with exactly the same size (identical number of bytes), but on the other hand the old ...
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Mounting a ZFS backup in a different root directory

I did a backup of the entire zfs root (zroot) dataset from my laptop to my workstation. The backup dataset got all the mountpoints from the laptop. tank/backup 91....
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Pool gone with upgrade to Ubuntu 20.04

I upgraded my server (SuperMicro X11-SSM-F, LSI SAS 9211-8i) from Ubuntu 18.04 to 20.04. The server had 2 zpools, one composed of a single WD Red 10 TB (downloadpool), and the other composed of 8 WD ...
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641 views

slow read on openzfs/Linux via NFSv3 on Debian 10

because of my unanswered question : qemu snapshot exclude device i decided to use NFSv3 for the VM to handle user data. Because of slow performance of BTRFS after maintance-tasks i use now zfs Raid1 ...
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1answer
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nginx with ZFS on linux with 16m recordsize too much arc fill and high io but low throughput

Nginx setup for static large file (100MB-16GB) serving on a CentOs v7.7 with a bound network 2x10Gbps. ZFS on linux is used. Pool size 50TB on 8x8TB disks Max arc size 65GB L2ARC 1TB nvme Recordsize=...
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ZFS and LXC Snapshots issue

Good Morning, I have a question about ZFS, because I'm a beginner. Situation: I snapshoted a lxc running on a zfs disk. Inside the container i saw a root-dir/disk size of 60-70 GB. However after that ...
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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 ...
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1answer
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Expand existing RAID1 zpool into RAID10 zpool

I'd like to expand/convert my existing RAID1 (2x 3TB mirror) zpool to RAID10 zpool by adding 2 more 3TB HDDs without losing (or moving) data stored on my existing pool. The final result will look ...
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How to overprovision an SSD for holding a smaller ZFS volume (ZVOL)?

I have a pair of 480 GB "Datacenter" SSDs (SAMSUNG MZ7LM480HMHQ-00005) that will make up a ZFS pool in a mirroring configuration. The pool's only content will be a ZFS volume (ZVOL) for a virtual ...
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ZFS compression on sparce zvol - space difference

I'm compressing a dd img of a 3TB drive onto a zvol in ZFS for Linux. I enabled compression (lz4) and let it transfer. The pool just consists of one 3TB drive (for now). I am expecting to have 86Gigs ...
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1answer
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How does ReFS deduplication compare with ZFS deduplication?

In terms of memory usage and processor utilization, how does Windows Server 2019 ReFS deduplication compare to ZFS deduplication?
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zfs not using full disk I/O

I have setup zfs on a fresh Ubuntu 20.04. But speed seems awfully slow. The disks can deliver 140 MB/s if run in parallel: $ parallel -j0 dd if={} of=/dev/null bs=1M count=1000 ::: /dev/disk/by-id/...
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Dell H730 in HBA mode - Why are there issues with performance and SMART data? [duplicate]

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 ...
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489 views

Dell R730xd - Best way to configure storage for simultaneous use with ZFS & Hardware RAID

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. Is it ...
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ZFS and Permanent errors - what does it mean?

I need a little help with a problem. I have a raidz1 pool: NAME STATE READ WRITE CKSUM data1 DEGRADED 0 0 0 raidz1-0 DEGRADED 0 0 0 sda ONLINE ...
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Huge IO performance degradation between proxmox ZFS host and WS19 VM

For more than a week, I am trying to determine the reason for the following IO performance degradation between proxmox host and a Windows Server 2019 VM(s). I have to ask for your help guys because I'...
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PosixACL and NFS

Background first, as always. I administer two HPC systems. Both are running the same OS, in the case CentOS 7. They both mount an NFS share that is provided by a server, which has a number of other ...
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Shrink ZFS loop backed image

How to resize (shrink) /mnt/var/snap/lxd/common/lxd/disks/default.img? It's a ZFS storage pool. I have installed LXD and created a container. During the creation it asked me for the size of the ...
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1answer
109 views

ZFS MOUNT is slow

I have a problem with an ZFS problem, and done fair bit of isolating, but getting stuck. Server1 - ZFS host, openbsd Server2 - Workhorse that has ZFS drive mounted, ubuntu An untar operation on the ...
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1answer
67 views

fio numjobs & iodepth Values to Simulate Database PostgreSQL Workload?

I am trying to benchmark a ZFS RAID-10 array of SATA SSDs using fio with settings that are somewhat representative of database workloads like for PostgreSQL. For example, for random reads: fio --...
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ZFS log partition got deleted: how to recover the partition table of this ZFS partition to recover the ZFS partition table?

I hadn't turned on my NAS system for some time, and something regarding ZFS broke when I turned the system back on. The setup for my ZFS pool is three 8TB drives in RAIDZ, with an NVME drive ...
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2answers
713 views

zfs: scrub vs resilver (are they equivalent?)

Is a resilver as good as a scrub? If not, why? Use case: during a scrub checksum errors come up. Instead of continuing with the scrub, stop it, replace drive and resilver. Did the resilver do some/...
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ZFS: edit zpool drive order of failing pool on ubuntu

I am a bit lost in what exactly happened and how to proceed with a recently expanded zfs configuration on Ubuntu 18.04. I have a storage server running smoothly for years using ZFS with 2 pools each ...
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1answer
60 views

Recover from “FAULTED” zfs pool. “-F” option seems to be ignored

On Ubuntu, I recently started trying out ZFS on an external USB hard drive. I now seem to have a corrupted zfs pool, which probably happened simply as a result of me shutting down my computer (with ...
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Shrink ZFS Zvol

I have a ZFS ZVOL: zfs get volsize pool1/vm/isp-master NAME PROPERTY VALUE SOURCE pool1/vm/isp-master volsize 1T local It contains those partitions filling less than ...
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1answer
190 views

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 ...
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ZFS-mount.service failing on boot

Fresh ZFS install, compiled from source with make and make install. ZFS runs fine except the pools are not mounted on boot. zfs-mount.service - Mount ZFS filesystems Loaded: loaded (/usr/lib/...
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Replace zfs pool member after reboot reordered disk paths

I created a raidz1-0 pool with three devices. Two where added by their /dev/disk/by-id ID and somehow I decided to use /dev/sdg1 for the third one. After a reboot years later, I can't get all three ...
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3answers
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ZFS on top of a bunch of Raid0 (1 disk) volumes with battery backed write-cache

I'm reinstalling a workstation (not a headless server) with an Intel RAID card with BBU and 4GB internal cache. My current setup uses ZFS on a pair of mechanical disks and a partition on an SSD for ...
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1answer
102 views

Get Array of Latest txg Values and Uberblocks Using zdb on a ZFS Pool

Can import pool. How can I find the a list of older txg values using zdb, so I can attempt to rollback to one of those versions.
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1answer
335 views

zpool fails to import raidz3 pool despite sufficient replicas available

Some users were having issues connecting to this server's share on the pool, while other's who were already on seemed to be fine. After arranging a reboot the pool failed to import once the system ...
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2answers
120 views

Durability of RAID-Z3 vs 4-way mirror

Is there a difference in durability between a RAID-Z3 and a 4-way mirror? AFAIU, both can lose three drives without losing data. Is there anything special with the parity that would make a RAID-Z3 ...
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1answer
255 views

How to change ZFS RAID 1 to RAIDZ-1 (Proxmox)

I have a server using proxmox (6.1) with VM living in a ZFS RAID1 called DATARAID. I have a new hard disk to use there, and I want to expand to RAIDZ-1, that seems to be faster that RAID1 (https://...
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Ext4 vs. XFS vs. Btrfs vs. ZFS for NAS [closed]

My use case: I have Ubuntu Server 18.04 installed on an M.2 SSD. I have a 4TB HDD I want to add as storage. Since it's mostly for large media files and backups, it won't be written to very often. ...
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0answers
57 views

Change ZFS mountpoint property without remounting

I want to replace one ZFS filesystem (volume in a pool) with another ZFS filesystem (another volume in the same pool). Rebooting is okay, but I'd like to avoid single user mode. When I try to set ...
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1answer
60 views

How to delete inaccessible data on root ZFS dataset?

I have a mirrored ZFS array on a FreeBSD that I used for home NAS, consisting of a 6TB internal drive and a 8TB external USB drive. I have 2TB of space occupied that should not be occupied, but I ...
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89 views

Recovering/importing ZFS Linux pool with duplicate pool name

I did something very stupid today in attempting to add a third mirror to an existing Linux zpool named backup. Suffice it to say that I made a couple errors because I don't really do much admin with ...
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1answer
109 views

ZFS deduplication

This is my first post on this website so please be kind with me :) On Centos 7, using ZFS deduplication in the past on a storage pool, I moved all file-systems that dedup was on to another storage ...
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1answer
115 views

How does zfs raidz-2 recover from 3 drives down?

Im wondering what happened, how ZFS was able to recover completely, or if my data is still truly in tact. When i came in last-night i saw this to my dismay, then confusion. zpool status pool: san ...
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61 views

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 ...
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1answer
55 views

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 ...
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1answer
312 views

Is there a way to tell if two identically-named ZFS snapshots are actually identical?

How can you tell if two ZFS snapshots are identical or simply named the same? Say I have two computers named host-a and host-b. Also assume that host-a has a ZFS dataset named /tank/mydataset. On ...
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1answer
25 views

zfs rollback/recovery of snapshot on different server

I have created a snapshot of zroot/jails/jail1 as jail1@2020-01-10T17:31:40 on server1 and sent this snapshot to zroot/backups/jail1 on server2 The snapshot was properly created on the ...
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1answer
104 views

When does “zpool scrub” delete files automatically?

Background is a general discussion about ZFS and the claim that in case of permanent errors to files, it automatically deletes files unless a correct copy is available. That sounded pretty wrong to me ...
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113 views

Samba Issue time with shadow copy

I was wondering if someone else has any experience with this before? Currently Version: 6.1 zentyal and Samba version 4.7.6-Ubuntu The time in the shadow copy does not show correct on the windows ...
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1answer
46 views

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) ...
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94 views

Full-disk encryption with dm-crypt requiring key-file AND password?

I am currently installing Arch Linux on ZFS on a dm-crypt (completely) encrypted drive, using the very helpful Arch Linux wiki pages regarding the subject: Encrypting an entire disk: plain dm-crypt ...

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