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Questions tagged [openzfs]

21 questions
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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
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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
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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
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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
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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
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2
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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
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.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
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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
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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
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1 answer

Recreate Dataset Without Any Data?

I have some datasets that are frequently written to, but whose data is non critical (caches etc.). Is it possible to "send" these to another pool without copying any of their data? I realised too late of course that I should have just done this when…
Haravikk
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ZFS checksum error: how to recover from a replica?

ZFS can automatically repair checksum errors if the drive with the error is part of a pool set up with redundancy. What about the case when the checksum error is on a pool without redundancy, but there is a replicated snapshot elsewhere? Can the…
Adam
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How to remove a device from a ZFS pool?

I wanted to add ata-TOSHIBA_DT02ABA400_90D1S0Q2S75H into the raidz1-0. Running zpool add tank ata-TOSHIBA_DT02ABA400_90D1S0Q2S75H unfortunately it becomes: $ zpool status pool: tank state: ONLINE config: NAME …
ロジャー
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ZFS/ZoL: Consequences of increasing zfs_vdev_async_read_min_active (and max)?

Vdev async read queues have min=1 and max=3 by default. All sync read/write queues are defaulted to min=max=10, while async writes get min=2 and max=10. Async reads are described as "prefetch reads" in the docs. So I take it that by design, when i/o…
Tavin
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No files after send/receive of snapshot between systems

I have two separate systems, prime and alt, on the same network in the same rack: prime 192.168.0.100 alt 192.168.0.101 Each system has a zpool running on it, created with the following sequence: > zpool create -O encryption=on -O…
pstatix
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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
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