Questions tagged [zfs]

An advanced file system that can span multiple disks, heal itself from data corruption, deduplicate data, encrypt, etc.

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How to repair the encryption hierarchy of encrypted datasets produced with send -w and received with -d

In https://github.com/openzfs/zfs/issues/12000 I have described a case were replicating encrypted datasets allows to load their keys, but does not allow to mount them. This was previously known as ...
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ZFS convert from RAID10 to RAID1 (mirror)

I have a ZFS array with 4x4TB, configured in a RAID10 so that it's two mirrors striped together. I want to convert this to 2x10TB, so I want only one mirror that consists of the two disks. Is there a ...
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How exactly do btrfs/ZFS (and related filesystems) prevent bit rot?

It seems that, since btrfs development began, various communities have touted both it and ZFS as inherently more advanced filesystems for preventing corruption, bit rot, etc. What features of btrfs or ...
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Is ACL inheritance only at file creation time on zfs?

I'm having trouble understanding how ACLs work on ZFS as compared to how they work on a Windows NTFS system. (In particular, I'm using a TrueNAS 12.) I create a SMB share ("smbtest"), and I ...
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Filesystem/LVM config that will prioritize “wearing out” smaller drives first

I've built a janky NAS box for myself that has a wide range of storage device sizes (20GB to 4TB) and all mashed together with BTRFS on Debian Linux. I've noticed that BTRFS will prioritize writing to ...
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ZFS disk always busy

Like many, I run ZFS on my home server with some random disk I had lying around. My setup looks like this: NAME STATE READ WRITE CKSUM rpool ONLINE 0 0 0 sdc1 ...
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ZFS Pool Config: VFX Studio

I am in the process of building my first ZFS NAS with TrueNAS Core and am looking to make sure what I have planned couldn't be done in a more efficient way. The NAS is to serve a VFX studio comprised ...
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Smartctl vs zpool

I have a 4 drive zfs raid. The zpool shows 12 read errors on a drive, but I ran smart scan (long, took about 6 hours) and that reported the drive as being ok. Does the drive need replacing or is there ...
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Cannot boot alternate boot environment in openindiana

i have installed two boot environment on my openindiana hipster 202004 server, rpool and rpool1. These are the steps i followed for my second boot environment: zpool create -f rpool1 c5t3d0s0 beadm ...
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ZFS does not recognize new drive after resilvering

I tested my ZFS resilvering on my new NAS which has a 3-drive mirror zpool. So I attached another 4TB drive to the server in an external USB SATA dock and ran zfs replace /dev/disk/by-id/ata-<...
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FreeBSD data lost after reboot

im not able to store the data after reboot. kindly suggest me the steps how to persist the data root@mfsbsd:~ # lsblk DEVICE MAJ:MIN SIZE TYPE LABEL MOUNT ada0 ...
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zfs mount points are disappearing on reboot. how to fix it?

my zfs mountpoints are disappearing on reboot but able to get it back after import. please suggest me the solution? root@mfsbsd:~ # zpool import edjstorage root@mfsbsd:~ # zfs list NAME ...
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ZFS Pool on internal ssd partition disappears after reboot, pre-existing partition (whatever it is) pops up instead

Mojave 10.14.6, OpenZFS installed with brew (OpenZFS on OS X 1.9.4 Mojave.pkg) By "disappears" here I don't mean "it's not imported", I mean actually, really disappears (no output ...
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DEGRADED disk is back ONLINE after reboot

I had a degraded disk on a ZFS volume in my FreeNAS server [build 9.10.2-U1 (86c7ef5)] and before trying to replace it, I rebooted the server. What does the following mean and do I have an issue with ...
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best zpool properties and features for hdd zfs

which properties and features should I use for the normal and mirror pool? (on ZFS on Linux on Ubuntu/Arch/Manjaro) I have two 4TB HDDs and I want to create two pools: normal (RAID0): with first 500G ...
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ZFS prevents server to shut down as it keeps disk active

I have a small home sever running with Debian Buster where I have a ZFS filesystem (ZFS: Loaded module v0.7.12-2+deb10u2, ZFS pool version 5000, ZFS filesystem version 5) with a RAID. As the server is ...
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Proxmox and Hardware RAID, which storage type

Proxmox and Hardware RAID, which storage type must use? I have been building a "Production environment" for apps 24x7, 3 IBM server, LSI raid card for RAID 5 on each one (for fault tolerance ...
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How to create a storage pool of drives (with existing data) without using RAID?

So I currently have an Ubuntu 20.04 machine that I'm running as a Plex Media Server. It has a 32gb SATA SSD used for boot, swap, /, and /home, as well as a 2TB M2 NVME SSD that I store my media on (...
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ZFS on Linux - one of four drives removed

I have a small server with 4 drive bays in the front, all have an identical 3TB drive. Now ZFS reports one drive is removed. The machine sees the drive but I can’t get the drive to become not removed. ...
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140 views

Cache configuration for PostgreSQL/TimescaleDB VM on ZFS with proxmox

I have a proxmox cluster of a single node and I want to start a new VM with a PostgreSQL and TimescaleDB and after a lot of reading about how to tune ZFS volumes for this purpose I still have some ...
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New QEMU images on NVMe: ZFS, or MDAM+LVM+LUKS+VDO?

I'm wondering if someone has experience with one or both options being considered, in the context of NVMe and/or VM images - and if the additional complexity of MDAM+LVM+LUKS+VDO is worth any ...
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ZFS and RAID configuration in a personal virtualization Proxmox 6.2 server

I happen to have this unused computer, and I upgraded its hardware a bit so I can use it as my personal platform for virtualized small servers. I plan to put Proxmox 6.2 on it but, before I install it,...
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pfSense with ZFS using physical raid

I am installing pfSense with ZFS. I have physical raid, and I don't want to use software raid. Should I just use stripe or Raid1 (mirror)? I am asking as when choosing stripe it asks me to select on ...
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Use ZFS boot drive on other PC

I have an Ubuntu boot drive that uses zfs, and I'd like to use it on another computer. When I try this though the pc just stays at a blinking cursor, I believe this is because of zfs' 'This pool has ...
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ZFS pool I/O is currently suspended due to disk mountpoint change (sdb to sdc). How can i fix it?

the HDD on which was mounted ZFS pool was physically reconnected and the result is that the zfs can no longer find the device at old location /dev/sdb as the drive got new name /dev/sdc. $ zpool ...
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Shrink ZFS deduplication table (DDT), disable dedup for good

I could not resist the temptation of giving ZFS deduplication a try, and now I want to get rid of the daemons of the past. Or in more technical terms, I have this... dedup: DDT entries 1481316, size ...
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55 views

FreeBSD ZFS: missing top-level device in zpool

As a result of 2 stupid sysadmin tricks on a FreeBSD 10.4 machine, I have a non-importable zpool in this state: # zpool import pool: v id: 5630710617833891462 state: UNAVAIL status: One or ...
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How to decrypt octal encoding from zfs diff output?

zfs diff replaces some of the characters in files names with \xxxx (in an octal encoding). Can I decrypt it back with awk or sed or any other common utility (without resorting to a perl or a python ...
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Disk layout: First 512 bytes are intentionally not used by filesystem(ext, xfs, brtfs) and volume management(lvm,zfs,brtfs), is this a design rule?

I suspect that all modern filesystem(ext, xfs, brtfs..) and volume management(lvm, zfs, brtfs...) intentionally avoid using at least first 512 bytes of the disk or partition, is this true? I know it ...
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rsync: chown “/some-destionation-path/.somefile.jpg.pY2TRG” failed: Permission denied (13)

I'm doing rsync -rlptoghv for transferring a folder from XFS to ZFS. Usually, no problems arise. But sometimes, for some files (and I can't find a pattern), rsync fails to sync file permissions and ...
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68 views

ZFS Scrub Errors even after replacing RAM?

I noticed my computer having a lot of ... weird issues. Crashes during compilations that were not reliable, etc. Finally, I noticed ZFS reporting data errors. I ran a memory test and got flakey, ...
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How to move a zone from one zpool to another on same machine?

I'm having a really hard time figuring out zfs, zpool, zones. I just got SmartOS installed on a PC, on the primary SSD. Then I created a zone without specifying a zpool then a zpool on a new disk. Now ...
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322 views

zpool cannot properly import missing pool after system crash

I have a raidz3 zpool on Ubuntu 18.04 with the Ubuntu built-in zfs features, there was a system crash recently, I guess it's caused by an unavailable(failed) disk, and after rebooting, the pool was ...
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ZFS modules suddenly stopped loading - Debian 10

My ZFS modules have mysteriously stopped loading at the point during boot when you would usually unlock the pool with encrypted ZFS on root (Debian 10). It drops into busybox and suggests loading the ...
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Preparing a ZFS based setup for a potential future upgrade

I want to try ZFS on some personal server. From my understanding, it's not possible to add disks to a vdev after it's creation, only to add new vdevs to a pool. Also, it's considered bad practice to ...
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291 views

ZFS of whole disks with ashift=12 vs of aliagned partitions?

About to create zpool made of 14 hdd disks, and I see options: can simple do zpool create -f -o ashift=12 DATA raidz2 disk1 disk2 ... or can use eg parted to create one partition on each drive ...
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incremental zfs send without “old” (common) snapshot

consider two machines A and B with zfs filesystems. I took a snapshot of A (let's call it syncsnap) and synced it over to B successfully. Now, I want to incrementally update B. Unfortunately, I ...
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87 views

Directory of an exported zfs pool comes back after removal

When i export a zfs pool, the folder where the the pool was mounted still exists with only some of the datasets the pool has contained before. Before re-importing I delete the directory where the pool ...
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restore zsys history in grub for ubuntu 20.04 (or revert to a previous state in command line)

I have installed Ubuntu 20.04 with Zfs on my Dell XPS-L702X, on extreme portable sandisk ssd. is it possible with zsys to revert the machine to a previous state (I mean a complete state, of course, ...
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How to I automatically mount a ZFS pool on an external drive automatically on boot

I recently moved an external/USB 3.0 hard drive on an ubuntu 19.04 desktop system from ext4 to ZFS. Previously, the drive would mount automatically to /media/user/drive_label on boot. If memory serves ...
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496 views

ZFS dedup performance optimization

I'm running a VDI server. Many of the VDI users are installing the same apps on their desktops, so zfs set dedup=on vdipool/myDesktop comes in handy. How can I optimize the performance impact of zfs ...
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368 views

ZFS zpool cannot be imported, cause panic if not imported as readonly

After a reboot, ZFS pool never stopped trying to import the pool. It was blocking the boot-sequence and I had to rename the /etc/zfs/zpool.cache to another name, in order to boot the system. There was ...
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ZFS reporting different disk usage, which one is correct?

I am trying to figure out how much space on disk is used by ZFS, with deduplicaiton eabled. I have only enabled deduplication, not changed chunk size or anything else. But depending on the command I ...
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307 views

Mounting zfs network shares in Ubuntu LTS 20.04 using cifs- mount error(2): No such file or directory

I have 3 Thecus NAS servers: a N5500 (Firmware: 5.03.02), a N5200XXX (Firmware: 5.03.02), and a N5550, (firmware 2.06.02.5.cdv) each configured as RAID 5. The N5500 and the N5200XXX are using zfs and ...
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439 views

ZFS broken on Centos 7.8

I am using ZFSonLinux under CentOS 7, and after a restart, the kernel updated to 7.8. the ZFS modules were not loaded and modprobe zfs said the modules were not found. dkms status was empty and having ...
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150 views

ZFS to boot ubuntu in 20.04 for SoHo server. Is this a good idea?

It seems ZFS is much more robust than ext4, specially for handling power failures or bad-blocks/media-corruption. There's old literature from 2013, 2014... here and there about ZFS as a boot ...
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601 views

ZFS Unmount Entire Pool

I'm getting issues when mounting my zpool. Some zfs aren't mounting because "directory exists", aka the subfolders that the subdataset is stored in. Such as tank/media/movies. It says that that /...
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Is it good idea to horizontally partition groups of disks into different ZFS vdevs?

--------------------------- +-------+ -------- | | | part | vdev 1 | | no redundancy -----------...
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Not sure if ZFS issue / ATA Linux controller issue?

I've been using ZFS for a few years now, but since moving to a new NAS I've been having a weird issue that I'm not even sure is ZFS-related. I run a RAID-Z with 4 4TB disks, and every week or so (...
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518 views

Grow ZFS RAID-Z[123] without degradation?

I know that on ZFS, the only way to grow a RAID-Z (or RAID-Z2 or RAID-Z3) vdev is to replace the disks with larger ones; there is no way to change the geometry. However, is it possible to do so ...

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