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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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How do I prevent ntfs-3g use starving my ZFS ARC of memory?

I have an HP Microserver running OpenMediaVault 2.1.18 (Stone burner), based on Debian GNU/Linux 7 (wheezy). A few days ago, I needed to copy a large number of files from a USB drive, formatted with NTFS. I connected it, mounted it and started the…
Mark Booth
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ZFS and controller level mirroring

If there are more than one SCSI controllers on your machine - there are disks from each controller - is there an option within ZFS to create a mirror of an existing pool so that sub mirror is picked from different controller than that of the initial…
sai garimella
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Missing free space from ZFS pool after migrating from FreeBSD to NAS4Free

I was running FreeBSD 10.0-RELEASE-p4 and migrated to NAS4Free which is FreeBSD version 10.2-RELEASE #0 r286738M: Thu Aug 13 21:32:58 CEST 2015. Now I'm missing free space and I can't delete any files from the pool. Reading files works fine. All…
raspi
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ZFS - Reconnecting a disconnected but fully intact disk

If a disk gets disconnected from a ZFS array, but the drive itself if totally fine, what happens when you reconnect it? For example, if I have a mirror of 2 drives, if one is disconnected, then reconnected, will ZFS simply continue where it left off…
AdorableHoneycrisp
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ZFS: what does it mean if all disks are ONLINE but resilvering takes place?

I have a pool of four raidz1 on Solaris 10, three of which look like this: state: ONLINE status: One or more devices is currently being resilvered. The pool will continue to function, possibly in a degraded state. action: Wait for the…
Pavel
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OpenZFS on OSX filesystem dataset performance issue

tl;dr - My ZFS RAIDZ2 array reads at 7.5+ GB/s and writes at 2.0+ GB/s when I specify a bs=128K or greater with dd. OS X is assuming 1K (as per stat -f %k .) and all my is ~300MB/s; dd gives the same performance with bs=1k. Even a bs=4k gives…
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NFS client, ZFS Server ZoL: cat to changed file ends with not found

We get in trouble since an update from our clients from Ubuntu 12.04 to Ubuntu 14.04. The behavior: On client A I change an existing file foo on a nfs share. On client B I do a cat foo. 1st time after mounting it works. cat shows the content of foo.…
Joerg Ullmann
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Can OpenAFS be used as NFS?

I have an application that only runs on Linux, which will generate ~500TB of data over the next year, which all must be kept and backed up each day. It would be temping to go with ZFSonLinux or btrfs, but they are not really stable. One option could…
Jasmine Lognnes
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Data recover hardware raid vs zfs pool

How does one recover data after disk failure in zfs software raid or Synology hw raid? Is it easier , less corruption in one or other ? Is one more susceptible to write corruptions than other ?
doesnt_matter
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Why is the use of ZFS without ECC RAM "not recommended"?

I've been reading up on FreeNAS and RAID Z, and one of the things people kept mentioning is that you shouldn't use ZFS (or more specifically, RAID Z) on a machine without ECC RAM. I'm wondering what the reasoning behind this is. Is this an issue…
Ajedi32
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What types of workloads require SAS disks compared to SATA?

I am looking to outfit my new server (new to me) with larger capacity disks. The server right now has 4 SAS 146GB disks in it. My original thought was to just buy larger SAS disks and replace or add more disks to the existing configuration. The…
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ZFS on Linux denied access when accessing child dataset on NFS

This is on 12.04 LTS with the latest ZFS on Linux from the ppa. I have two a storage pool named data, and a dataset data/Other with different settings (e.g. compression). I set data to sharenfs and data/Other to inherit sharenfs from data. From…
eengineer
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Rsyncing to a compressed zpool

I've been Rsyncing from an NFS mount to a local zpool that has compression enabled on it. When I rsync, it copies every file over, not just the new/changed ones. Is this because the file size is different on the two due to the compression on the…
Copy Run Start
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Resilvering for data transfer?

I currently have a production server with four drives in raidz2 and a backup server that is identical in configuration and hardware. I'm currently doing a transfer of data using rsync between the production server and the backup server. I'm finding…
John A
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zfs raidz can not read from disk

my freebsd 10 server running on zfs raidz. I have a problem with reading files, test dd of=/dev/null if=/tmp/test/1000mb.bin bs=1024k count=1000 953+1 records in 953+1 records out 1000000000 bytes transferred in 31.144059 secs (32108853…
Tony
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