ZFS is a modern filesystem originally developed by Sun Microsystems and licensed under the CDDL. 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 & MacOSX communities.

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ZFS on FreeBSD panic: allocating allocated segment

My PCBSD (i.e. basically FreeBSD) system won't boot anymore, I'm getting the above error message when importing the storage pool. This is apparently a known issue (see e.g. here, here or even Oracle's ...
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47 views

Prevent HDDs from spinning up before shutdown in Ubuntu/ZoL/SAS2008 environment

I am running Ubuntu 14.04.2 with ZFS on Linux. As I ran out of SATA ports on my Asus M5A78L-M/USB3, I bought a Dell PERC H200 card and crossflashed it to LSI 9211-8i P19 IT mode firmware to ...
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1answer
61 views

ZFS cksum errors on LSI 9207-9i (SAS2308) with Samsung 850 Pro SSDs

I am testing an LSI 9207-8i controller with 8x Samsung 850 Pro 256GB SSDs attached. SSDs are running latest firmware EXM02B6Q, controller is running P17 and has exhibited same issues with P19. Server ...
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2answers
119 views

Convert ZFS mirror with 3 active disks into 2 + 1 hot spare

After installing Proxmox VE 3.4 with ZFS and raid1 using three disks I get the following pool: root@pve:~# zpool status pool: rpool state: ONLINE scan: none requested config: NAME ...
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1answer
106 views

How can I validate a ZFS snapshot image residing on a backup system?

I'm running a FreeBSD host with ZFS. Let's pretend that I am storing a series of incremental ZFS snapshot images on a remote host using zfs send: zfs send -i zpool/data/foo@04hoursago ...
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2answers
35 views

Does ZFS in mirror mode double vdev read performance?

I'm not able to find a clear yes/no answer to this simple question: does using ZFS in mirror mode double the read performance of the underlying vdevs? This applies to either individual requests or ...
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1answer
23 views

Does the LSI 9211-8i add any data structures of its own when used in pure HBA (JBOD) mode?

I'm looking at adding some disks to one of my systems, for which I need to add an offboard HBA. Looking around, I came across the LSI MegaRAID SAS 9211-8i (LSI part number LSI00194) which looks quite ...
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245 views

incomplete recursive snapshots on zfs

I got a bunch of new disks on one of our systems and wanted to transfer an existing pool over to them so what I did was this: zfs snapshot -r old-pool@replicaton zfs send -R old-pool@replication | ...
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1answer
83 views

ZFS shows pool state FAULTED, but all devices are ONLINE; how can I recover my data?

Our 100TB NAS based on FreeNAS 8 was unexpectedly powered off due to power failure. After turning it on back, 100TB zpool "projects" was unmounted with state "FAULTED". I've tried zpool import -fFX, ...
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73 views

Why is the use of ZFS without ECC RAM “not recommended”? [duplicate]

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 ...
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13 views

ZFS raidz1 or raid10 or both? [migrated]

This might be a long post. I am currently building a new server to replace ESXi with SmartOS. I currently have 4 - 2TB drives of uncertain origin in a raid10. I believe 2 are greens and maybe a black ...
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2answers
43 views

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 ...
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2answers
56 views

Convert raidz1 to raidz2 via a temporary drive

I set up a new NAS server a few months ago and set it as RaidZ. I'm re-thinking that decision and would like to grab an extra drive and move to RaidZ2. Before everyone replies that this isn't possible ...
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1answer
57 views

What is a good configuration for a zpool built from 8-10 SSD for a home file server exported via NFS?

So we have a bunch of SSD disks and would like to put them in a zpool on a Solaris 10 system. The file system will be exported via NFS to about 50 Ubuntu clients which will mount it as their $HOME. I ...
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2answers
66 views

Performance for ZVOLs presented over iSCSI?

I have the following setup for testing: HP Microserver N36L (Dual-core low-power Athlon64) 8GB ECC RAM 2-port Intel Gigabit NIC 4x3TB WD Green (5400 RPM?) 1 sata disk for OS image (FreeBSD 10.1) ...
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1answer
23 views

ZFS: how to receive into root of pool?

It seems like it would be an easy question, but I've been looking around for several days and can't figure out a way to do this. Part of the problem with finding an answer seems to be that most ...
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1answer
59 views

GPT partition errors on boot - ZFS FreeBSD

My system appears to be running fine and I'm just trying to clean up errors. That said... On boot, I get the following errors for all drives in a 24 disk storage enclosure: GEOM: ...
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1answer
27 views

Undo adding disks to a RAID-Z Configuration

I've started running out of space on one of my data pool and decided to expand it by adding some extra disks. Below is what it looked like before extending: NAME STATE ...
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66 views

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 ...
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58 views

How to best use Amazon's “ephemeral” SSD devices under Linux? [closed]

Amazon attaches "ephemeral" SSD device(s) to most of the instace-types -- these are included in the cost of VM, are fast, but any data on them is lost, when the VM is shut down. How to make the best ...
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2answers
46 views

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 ...
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1answer
84 views

User permissions/feature limitations of the native zfs smbshare service on linux

I'm using zfs on linux, using the sharesmb=on option to try out the native smb share feature instead of adding the zfs tank path to my smb.conf file. The share has shown up on my windows machines, ...
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1answer
316 views

freenas disc problems - smart error - how to repair zfs raid?

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 causes the problems. The system is booting however reacting pretty slow. ...
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407 views

Slow performance due to txg_sync for ZFS 0.6.3 on Ubuntu 14.04

I am using native ZFS with "ZFS on Linux" installed from the PPA here. Setup was not a problem and I am using it in mirrored configuration with two WD 4TB Red HDDs. Unfortunately I am having ...
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2answers
141 views

ZFS - Recover or repair a corrupted file in a snapshot from backup

A pool has suffered permanent data corruption to file data that's part of a snapshot. If the file data was part of the filesystem (and not part of any snapshot), I could simply recover the file from a ...
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1answer
96 views

Nexentastor CE on Supermicro X10DRL-I

I'm writing here because after 3 hours i'm still not able to install NexentaStorCE on my brand new server. The hardware configuration is: Supermicro x10drl-i Xeon E5 2609V3 16GB DDR4 Kingston I'm ...
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1answer
140 views

ZFS - zpool replace never finishes

I have a 5 x 3TB raidz1 array on a ubuntu 14.04.1 server. Last month, one of the drives died (audible clicking). I was able to replace the drive with zpool replace RAID <dead drive> <new ...
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2answers
64 views

ZFS pool members start sectors overwriten, including partition table and L0 L1 labels. Data and L2 L3 labels intact. How to recover?

Have two identical 2Tb disks in mirror ZFS pool. Unfortunately, overwriten start of disks with errorneus attempt to attach them via HP Smartarray P400 RAID controller as separate RAID0 logical volumes ...
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1answer
40 views

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 ...
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59 views

ZFS pool reports a missing device, but it is not missing

I am running the latest Debian 7.7 x86 and ZFS on linux After moving my computer to a different room. If I do a zpool status I get this status : pool: solaris state: DEGRADED status: One or more ...
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123 views

Understanding zpool status output

I'm having difficult understanding the output after running the zpool status command: NAME STATE READ WRITE CKSUM tank ONLINE 6 0 0 raidz2-0 ONLINE ...
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37 views

Solaris ZFS, cant send/recv to remote encrypted pools?

I'm trying to do a simple task, which is to send a snapshot of a dataset to a remote pool. Both src/dest pools are encrypted. Here is the command I issue: zfs send -R testsnapshot@2014 | ssh ...
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2answers
156 views

How to migrate a ZFS filesystem to use compression?

Question at the bottom. I have several ZFS file system I would like to use ZFS compression, but since enabling the compression will only affect new data written to the file system, I would like to ...
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1answer
33 views

Solaris: Encrypting a zpool NOT a dataset within a pool?

What is the way in Solaris to encrypt a zpool? All the documentation supporting ZFS encryption talk about using "zfs create" and specifying a dataset WITHIN a pool. I just became SA for several ...
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4answers
170 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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2answers
470 views

Inplace migrating ZFS RAIDZ with 3 drives to 4 disks, when pool has more than 1/3 of free space

On creating my RAID-Z pool on ZoL I assumed, I could easily just drop-in additional disks later on. Meanwhile I learned that this is yet not possible. But... I had a similar problem on creating my ...
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3answers
171 views

Does a NetApp NAS provide features with VMware compared to a ZFS based NAS?

Are there feature advantages from a VMware point of view to use a NetApp nas instead of a ZFS based NAS running e.g. OmniOS? Another way to formulate the question: Are there features unlocked when ...
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1answer
248 views

ZFS on Linux + KVM Steals Memory

I'm having an issue with a CentOS 7 server where I have a single ZFS pool created along with (currently) a single running KVM VM (CentOS 6 guest). Top is reporting that the VM is using about 50% of my ...
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1answer
246 views

Linux ZFS does not buffer writes to write buffer (SLOG/ZIL)?

When experiencing write I/O, the log column in zpool iostat -v does not show any ZIL activity, ever. This results in higher than expected wait times when writing data to disk (sometimes over 80ms ...
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3answers
160 views

Long running VMWare snapshots are bad… but what about VMDKs on a ZFS\LVM snapshot?

The VMWare KB and multiple blogs state that long running snapshots are bad for both performance reasons and integrity. They have valid points. Granted this is not with ESXi but rather ...
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2answers
144 views

Virtualized Storage for other VMs on ESXi host [duplicate]

This question is two fold. Part 1: Is it a bad idea to virtualize a storage solution and run VMDKs off of that as opposed to the original VMFS datastore. Essentially lets assume I have 2 TB worth ...
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2answers
642 views

Alternative file system/volume manager for ZFS w/ non-ECC RAM?

It's not recommended to use ZFS for a computer without ECC RAM. So, what's a good alternative then? Or is the risk the same, so it doesn't matter what manager I use, it'll be the same problem if a bit ...
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103 views

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 ...
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1answer
255 views

best way to create perfect mirror of zfs based backup server

The existing system: I have a FreeBSD based backup/archive server, which pulls the backups from the live servers via rsync every night and does a zfs snapshot to archive the backup contents for a ...
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0answers
100 views

Why is ZFS not doing anything with my disk's duff sector?

I was under the impression that if an I/O error occurs during a read from a ZFS pool, two things will happen: The failure will be recorded in either the READ or CKSUM statistic of the relevant ...
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2answers
595 views

Is it possible to detach and reattach a ZFS disk without requiring a full resilver?

I have a ZFS mirrored pool with four total drives. Two of the drives are intended to be used for rotating offsite backups. My expectation was that after the initial resilvering I could detach and ...
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2answers
178 views

Solaris 10 ZFS ARC Maxed Out and CPU's Overloaded

We've been running ZFS for a couple years now on Solaris 10 on Oracle M5000 Enterprise server with 32 CPU cores and 256GB of memory. We are running a database/application on this server which appears ...
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1answer
231 views

FreeNAS zfs zraid two failing disks

I have a FreeNAS 8.3 file server with ZFS running four 3TB disks in raidz. camcontrol devlist: at scbus0 target 0 lun 0 (pass0,ada0) at scbus1 target 0 lun 0 (pass1,ada1) ...
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2answers
306 views

ZFS RAIDZ2 read and write speeds really slow?

I'm running 3 Samsung HD103SJ 1TB and 1 Samsung HD103UJ 1TB under Lubuntu with zfs raidz2, using a HP ProLiant N54L (AMD N54L, 4GB RAM). Moving a 10 GB file between 2 folders on the pool takes 15 ...
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3answers
3k views

ZFS - Is RAIDZ-1 really that bad?

I have an NAS server with 4x 2TB WD RE4-GP drives in a RAID10 configuration (4TB usable). I'm running out of space (<1TB usable space left). I have $0 to spend on bigger/more drives/enclosures. I ...