ZFS, which stands for Zettabyte File System, is a combined file system and logical volume manager designed by Sun Microsystems.

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Do ZFS zvols on Linux use the arc cache ?

Is the ZFS arc cache used when doing an open() on a zvol device, or only when accessing ZFS datasets ?
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How replace disks on an existing striped zpool?

I have the following zpool: pool: mypool state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM mypool ONLINE 0 ...
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41 views

On Gentoo, ZFS stops working after 0.6.5 update

I just updated my Gentoo system, updating my world, including ZFS. Everything but the kernel. I figured I'd do a reboot first, then build a new kernel. Currently, it's running on kernel ...
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ZFS: Mirror required on backup system?

I plan to backup some of my file systems to a remote server via zfs send. The pool to which I plan to send the backups to is exclusively set up for the backups of my main system. Do I need to have a ...
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44 views

FreeBSD complains “invalid partition table”—still boots

I've recently installed FreeBSD 10 on my Dell Precision M4800 with ZFS as the root file system. The operating system is installed on an mSATA SSD, a 2½″-HDD is installed, too. On startup, the system ...
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How to distinguish ZFS pool from mounts?

I'd like to zerofill all free space in partitions inside a FreeBSD virtual machine. The virtual machine contains a 512K boot freebsd-boot type slice (hope I got the terminology right here), followed ...
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ZFS Snapshots and low space on zpool

I am trying to backup every hour my zvols. I am using zfs for virtual servers on Proxmox VE. I made myself script, which runs snapshot every hour and then send it to offsite backup, then bookmarks ...
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37 views

Solaris 11 /var used significant space, but I cannot see it on filesystem

I have a mirrored rpool: NAME USED AVAIL REFER MOUNTPOINT rpool 72.1G 1.22G 39.5K /rpool rpool/ROOT 67.9G 1.22G 31K legacy ...
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26 views

inconsistency between format and probe-scsi-all outputs

my platform: SPARC T4-1 Generic_150400-24 sun4v sparc sun4v 1 of the disk is seems different in the output of format when I am on console cli even though relevant disk seems same as others in the ...
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44 views

How to mount /boot from LiveCD (FreeBSD 11 ZFS)

FreeBSD 11 (current) with ZFS I can mount zroot with zpool import -fR /mnt zroot but /mnt/boot is empty (and it's even not a directory) I need to edit loader.conf, how can I do it?
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151 views

Solaris 11.3 upgrade - rpool changes after upgrade disappeared after restart

I have a test server running Solaris 11.2 (on HP Proliant Gen8 Microserver hardware). On October 31st I upgraded the system to Solaris 11.3 as described in Solaris documentation article Updating a ...
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173 views

Btrfs/ZFS Network Replication

Is it possible to replicate a ZFS or Btrfs raid volume in real-time (or as close to as possible, network specs aside) over a network? ZFF and Btrfs are ideal because of their CoW properties. I'm ...
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How to make mdstat ignore specified devices

I have a hypervisor with KVM that uses zvols for virtual machine storage. One such virtual machine was moved from a physical one and has software RAID inside it. Zvols are detected as block devices on ...
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100 views

ZFS disabling sync writes on dataset

I have a freenas box that I use to back ESX VMs to but don't have a SLOG yet and thus speed is poor due to ESX pushing sync writes to the NFS store on my freenas box. If I created a separate ...
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127 views

Why can't I import an ZFS pool without partitioning the data disk with fdisk?

I have a strange situation here, in which I am unable to import an ZFS pool that I brought from another OS UNLESS I fdisk the disk of the pool. I am puzzled as to why this is happening and hoping to ...
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25 views

Server hardware errors?

I have a large data server running ZFS-on-Linux under Debian 6.0.10, which has been running stably for several years. In the last two weeks, however, it's been crashing every few days and throwing ...
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59 views

Recovering data from a UFS drive with bad superblock

I've got a UFS drive that has a bad superblock. I've used mke2fs to find the alternate superblocks. The drive has a zfs_member on it named "james". How can I mount the drive with the alternate ...
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Having a host with ZFS system, how to make it available to other hosts on local network?

Having a Linux (RHEL 6) host with ZFS system, how to make it available to other hosts on local network (over LAN or InfiniBand if possible)? what shall be done to ZFS pool to make it sharable? how ...
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zfs dataset constantly unmounting itself after some time, others still available

I have a linux box, that i putty into, which is my backup system. It has a zfs linear span array with 3 2TB drives. Every night i use freefilesync (great program) to sync files to this mount, which ...
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How to install a system on top of ZFS?

I have a clear system with 5 hard drives, bios. No OS installed, no formatting applied to hard drives. I want to install a Scientific linux (6.6 or higher) OS on top of ZFS on it. What are the ...
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267 views

Bulk remove a large directory on a ZFS without traversing it recursively

I want to remove a directory that has large amounts of data on it. This is my backup array, which is a ZFS filesystem, linear span, single pool. The data is in this pool called san, mounted on /san ...
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How to turn default Scientific Linux on top of some file system into linux on top of zfs?

So I have a cluster with an array of hard drives (say 6), currently they are not in any RAID, on top of one of them I currently have my Scientific Linux installed and running. How to migrate it onto ...
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237 views

FreeBSD “Fatal double fault” upon entering ZFS encryption password

I have just installed FreeBSD 10.1 Release i386 on a new computer. I pretty much used the standard installer defaults, except I chose ZFS, RAID-Z1, encryption, and encrypted swap, and I did not ...
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53 views

How do I test or verify ZFS encryption is working?

How do I test or verify that the ZFS encryption is working, especially when running as a Samba share? Like if I create a ZFS pool with encryption=on, how can I tell whether a file is being properly ...
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Solaris 11 and zfs, i don't understand space used

This is the situation. Solaris11 virtual machine on VirtualBox as guest. Virtual disk is 55GB df report Filesystem Size Used Available Capacity Mounted on rpool/ROOT/solaris-8 55G ...
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68 views

Download small ZFS formatted image

I don't run Linux myself, so I'm the odd one out here, but I have hopelessly been searching for a small image file that contains ZFS (e.g. ZFS formatted media). I like to implement ZFS recognition in ...
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136 views

zpool import can't import an online pool

I rebooted my Ubuntu 15.04 server and found that my ZFS pool did not import. I'm puzzled as to why this is happening. Here is the output. root@ubuntuserver:/# zpool import pool: store1 id: ...
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79 views

ZPool export/import error

A backup/clone script of ours was recently ran. It normally only clones the rpool and renames in rpoolA. Something must've changed as it found another one of our pools that it shouldn't have. It ...
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55 views

How to troubleshoot disk controller on Illumos based systems?

I am using OmniOS which is based off of Illumos. I have a ZFS pool of two SSD's that are mirrored; the pool, known as data is reporting its %b as 100; below is iostat -xn: r/s w/s kr/s kw/s ...
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Sample monitoring of ZFS using mrtg

Was wondering if anyone has a quick and simple mrtg hack to monitor a ZFS file system, thought it would be wise to ask before writing one up myself....
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161 views

zpool online doesn't work

I've hard disk failure on this pool. I replace the disk, I don't have any hard error and I can not to put back it online as nofified: :~# zpool status data pool: data state: UNAVAIL status: One or ...
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ZFS Mirror on same drive for redundancy?

The device I would like to use as a home server has only a single 2.5'' internal hard drive bay currently fitted with 1TB. The actual data storage (2x 1TB) will be attached to the external USB 3.0 ...
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Failed umount /home (ZFS) on shutdown

During shutdown I notice an error reported in the logging messages on the screen that the umounting of /home (a ZFS filesystem) failed. (After restart I don't find any respective log entry in the ...
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402 views

ZFS Raid or Hardware Raid in FreeNAS

We bought SuperMicro server "SUPERMICRO CSE-826E16-R1200PB" which will be used for storage. Total HDD 10 - 4TB Seagate HDDs 2 - 60 GB SSDs Now im planning to install FreeNAS on it . And i will ...
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232 views

zpool states that zones are in SUSPENDED mode

Zones are in suspend mode how can I bring them up online? Operating system: SunOS xxxxxxbase02 5.11 11.2 sun4v sparc sun4v While listing the pool in global zone I can see four hosts are in suspend ...
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Does ZFS for Linux over stress VirtualBox?

I've been using MD raid + LVM for many years, but recently decided to take a look at ZFS. In order to try it, I created a VirtualBox VM with a similar layout to my main server - 7 'SATA' drives or ...
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49 views

BSD crashing after creating ZFS pool

I've just installed FreeBSD 10.1 on a virtual machine (using Oracle VirtualBox), and I'm attempting to enable and setup ZFS. I did the following commands: # mkdir /tut/ - from root dir # echo ...
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107 views

ZFS allocation algorithm

I'm looking for a way to know which algorithm ZFS is using to find free blocks. By default there are two algorithms: Best Fit First Fit These are automatically changed once a threshold is passed ...
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232 views

How to import ZFS pool with different configuration

After rebooting my ZFS pool was unable to open my main pool. The exact error that I'm getting is: "The pool metadata is corrupted and the pool cannot be opened" When I checked the zpool configuration ...
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393 views

FreeBSD 10: Disable ZFS full disk encryption

I installed FreeBSD 10.1 and chose to encrypt the ZFS root volume and Swap during install. I'm now realizing that on the remote KVM vserver I'm on the encryption makes rebooting harder and probably ...
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332 views

FreeBSD 10: Do I need jails?

I'm in the process of setting up a FreeBSD 10 server with just some services on a KVM server: NGINX webserver w PHP-FPM 2 domains, 3 subdomains Mailserver 3 Email addresses MySQL (or other) ...
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156 views

FreeBSD 10 and ZFS: Methods for encrypting files

I'm in the process of setting up a FreeBSD 10 server on a KVM vserver. I'm really new to FreeBSD in general (coming from Debian Linux). I installed the system choosing ZFS with encrypted root volume ...
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502 views

Can BTRFS stripe RAID arrays?

I've been using an Ext3/4+lvm2+mdadm file system setup for about 5 years on a file server. This has grown (and moved processors a couple of times) and I've moved disks between systems ...
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114 views

ZFS on Linux volume low freespace. Usedbydataset is larger than volsize

I have a storage with ZFS and Debian wheezy. I am always using the latest ZFS from their github. I created 3 different raidz-3 pools. One for every controller. On every controller I have 24x 4T SATA ...
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freenas disc problems - smart error - how to repair zfs raid?

Whats the best way to analyse problems on an freenas raid file server? I have troubles with my freenas 9.2.1. It crashed today. Its running a fileserver on zfs jbod raid 2. I'm not sure what exactly ...
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FreeBSD bootloader won't boot from the correct pool

I've installed FreeBSD 10.1 on a system which has two ZFS pools, and which boots from an other hard disk, which contains only the bootloader. The main pool disks are connected to SATA ports on a PCI-E ...
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609 views

ZFS backup advice with another server

I currently have two servers both have the exact same hardware, disks, etc. One server (server1) is going to be the "main" server. It's basically a server with raidz2 that has SMB shares on it that ...
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273 views

Cannot create new zpool

I'm working on creating a ZFS zpool and I'm getting the following error: # zpool create main_zfs raidz2 /dev/sdc /dev/sdd /dev/sde /dev/sdf /dev/sdg /dev/sdh /dev/sdi /dev/sdj /dev/sdk /dev/sdl ...
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133 views

ZFS ACL (NFS4 ACL)

I'm using Openindiana (Solaris 10) containers and I want to let users upload web content over sftp I'v managed to setup internal-sftp of openssh and lock user under web root. All the files under web ...
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240 views

iostat error counters on Solaris

In a Solaris system i use iostat -E and kstat to identify faulted disks. My problem is that I don't know if the problem is on disk, on controller, on bus or on the filesystem layer (ZFS). The key is ...