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Questions tagged [openzfs]

27 questions
7
votes
3 answers

Syncthing on ZFS a good case for Deduplication?

I've have a ext4 on LVM on linux RAID based NAS for a decade + that runs syncthing and syncs dozens of devices in my homelab. Works great. I'm finally building it's replacement based on ZFS RAID (first experience with ZFS), so lots of learning. I…
clemtibs
  • 191
5
votes
1 answer

Why doesn't ZFS vdev removal work when any raidz devices are in the pool?

First: I'm perfectly okay with accepting that this is the case for now and am not looking for an immediate solution, rather I'm trying to understand the technical limitation for this constraint. I'm working primarily with ZFS on Linux, but my…
Joachim Sauer
  • 912
5
votes
3 answers

ZFS performance: Extreme low write speed

I am running a small home server. The specs are: CPU: AMD Ryzen 5 2600 RAM: 32 GB ECC System drive: 128GB NVMe SSD Data drives: 3x 4 TB Seagate Barracuda HDD The server runs some applications like Nextcloud or Gitea and I want to run 1-2 VMs on…
Philip Szalla
  • 101
  • 2
  • 7
4
votes
1 answer

Erasing Contents of a Parent Dataset Without Destroying Children?

I have a parent dataset under which are stored a number of other datasets that are still in use. In the past I also used the parent itself to store data, as it was part of a directory hierarchy. However, I no longer need the parent dataset's…
Haravikk
  • 417
4
votes
3 answers

Tuning ZFS for bursty sequential writes

This is a follow-up to: High speed network writes with large capacity storage. The setup has changed notably. I have a pool with a single raid-z2 with 6 drives, all Exos X18 CMR drives. Using fio and manual tests I know that the array can sustain…
Emma
  • 414
3
votes
1 answer

What are potential dangers of spanning ZFS RAIDZ over different size disks?

I am redesigning my homelab servers from scratch, and want to try ZFS after experimentation I've done. I know there is a limitation that disks in vdevs must all have the same size, otherwise only the smallest one would be used. That's a problem for…
toriningen
  • 271
3
votes
1 answer

What ZFS pool, vdev and dataset properties should most people use?

ZFS has many different configurable properties for pools, for vdevs and for datasets. Many of those can be changed at any point, but some can only be set at creation time (or only affect data written afterwards so should really be set at creation…
Joachim Sauer
  • 912
3
votes
1 answer

Forcefully forget / unmount ZFS pool after drives disconnected

First off, I made a mistake & I acknowledge that, but now I'm stuck with a "broken" ZFS driver and want to restore it without rebooting my machine. How I can say ZFS on Linux to just forget the existence of a pool (forcefully unmount & "export" it)…
Felix Stupp
  • 143
3
votes
1 answer

rsync "Operation not supported" errors for ACL on ZFS

While migrating our file server to a ZFS file system with rsync -avxHAXS ... I get errors like: rsync: [generator] set_acl: sys_acl_set_file(path/to/file, ACL_TYPE_ACCESS): Operation not supported (95) I've already configured ZFS ACL settings…
Roger Dueck
  • 201
3
votes
0 answers

ZFS: Suppressing reservation on receiving side?

I'm trying to incrementally send changes for a zvol from my working pool (zdata) to a backup pool (zbackup), however I'm struggling to suppress the refreservation property. While I realise that the purpose of this property is to ensure that the zvol…
Haravikk
  • 417
3
votes
1 answer

Are ZFS Automatic Spares Size-Aware when Using "autoreplace=on"?

Max ZFS codebase for pool: zfs-linux (0.7.5-1ubuntu16.11) Imagine a pool that grew unexpectedly, by adding larger mirrors in terms of physical disk capacity. Spares went in tow. New mirror, new spare. SAS Enterprise Grade on HBA. Mirror 0 is smaller…
Louis Waweru
  • 815
2
votes
1 answer

dRAID, Parity 1 + 1 Distributed Spare Better than basic RAIDz2 for 5x12TB HDDs?

Stumbled on dRAID recently and was grokking the docs for OpenZFS on linux and I came away with a conclusion from the chart that I wanted to double check. This is a brand new system that I'm currently building from scratch and trying to plot out how…
clemtibs
  • 191
2
votes
2 answers

Is it possible to repair a ZFS snapshot by re-sending it?

Given two ZFS pools where snapshots from one are sent to the other, is it possible to automatically repair a damaged snapshot using a copy of that snapshot stored on the other pool? I'm hoping this will only ever be a hypothetical question, but it…
Haravikk
  • 417
2
votes
1 answer

Booting a Debian Live ISO on QEMU

Situation: A server: access only via SSH (no physical access, no KVM) a netboot OS (Debian/Jessie) 3 x 2T HDD 16G RAM Final goal: Building a ZFS pool with the local HDD and install Debian on a ZFS root, the netboot OS is missing packages to…
freezed
  • 198
2
votes
2 answers

.zfs folder's missing, but snapshots are still there and mountable (inode trouble?)

$ sudo zfs list -t snapshot | grep childDataset3 a whole bunch are listed as expected (e.g. pool/dataset/childDataset3@today) $ ls /pool/dataset/childDataset3/.zfs ls: cannot access '/pool/dataset/childDataset3/.zfs': No such file or directory I…
S Hunter Simpson
  • 41
1
2