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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2
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0answers
14 views

zpool import one or more devices is currently unavailable

zfs drives from a FreeNAS that wouldn't power up after a move. Pulled the disks, scrapped the box, now I can't import any pools. I've tried zfs on Linux and freeNAS from shell on my laptop (using ...
2
votes
1answer
21 views

Why isn't my ZFS pool expanding using ZFS on Linux?

I have a ZFS zpool on linux under kernel 2.6.32-431.11.2.el6.x86_64 which has a single vdev. The vdev is a SAN device. I expanded the size of the SAN, and despite the zpool having autoexpand set to ...
0
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0answers
24 views

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 ...
1
vote
1answer
25 views

Persistent ESXi iSCSI datastore from guest VM based target? [on hold]

I'm in the process of building a home lab environment for Cisco and VMware that will also double as a NAS. The system runs ESXi v6.0 bare metal. Part of my design is that I have a Lenovo TS440 with ...
3
votes
3answers
373 views

Is it safe to boot a linux server from a USB drive?

I have an HP DL360 G7 server I plan to install KVM and ZFS on. The purpose is going to be a lab in a box. I have the 8 drive bays in the front loaded with 4 drives and an SSD (for the ZFS ZIL cache). ...
0
votes
1answer
30 views

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, ...
1
vote
2answers
60 views

zfs error behind LSI raidcontroller

So ZFS is reporting some "read issues", so it would seem that this disk is failing, based on the fact nothing given in the ZFS-8000-9P document reports has occurred we are aware of. These disks are ...
0
votes
1answer
82 views

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 ...
1
vote
1answer
21 views

Can I prevent exportfs from from breaking ZFS sharenfs exports?

I'm using ZFS on Linux as a fileserver running Ubuntu Server 14.04 LTS. The ZFS pool shares a number of datasets using it's sharenfs property. Outside of ZFS there are a few additional NFS shares ...
-1
votes
1answer
47 views

ZFS on USB disks isn't mounted on boot [closed]

I have a ZRAID on two disks on a disk hub connected to the server via USB 3.0. The system is FreeBSD 10.1. Now even though the ZRAID gets imported on boot, it doesn't get mounted. I've set a mount ...
1
vote
1answer
19 views

Can I “flush and lock” an Oracle database to do a filesystem backup?

I'm using ZFS to take snapshots of running OpenVZ containers. For MySQL databases I can use flush tables with read lock to put them in a flushed & locked state. This will put the underlying files ...
1
vote
1answer
37 views

ZFS estimated send size much larger than total data size

From zfs send -R -v pool/fs@snap: send from @ to pool/fs@snap estimated size is 6.50T ...but from zpool list: NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT pool 3.62T 2.36T 1.27T ...
1
vote
2answers
35 views

Having trouble mapping solaris drive paths to physical disks

I have a supermicro box with 24 drives in front and 12 drives in back. It's running x86 solaris 10 with zfs. Here is the output of zpool status: NAME STATE READ WRITE ...
1
vote
0answers
28 views

zfs pools unavailable, disks shared with other pools

My ZFS pool called data do not mount anymore after a shutdown. Maybe there was some automatic update on the computer. I Don't know. zpool status returns no pools available zpool import returns ...
2
votes
0answers
35 views

why are zfs on linux transfer rtates reported incorrectly after expanding array?

I have upgraded the drives in a 4 drive Raidz array in a NAS server and the array has auto expanded to the new size. In testing transfer rates from the NAS server now I observe that when performing ...
0
votes
1answer
38 views

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 ...
1
vote
1answer
33 views

How much memory is required to send deduplicated ZFS stream?

Last year I set up a pair of servers for my employer, running FreeBSD 10.1 with a large pool of storage in each server. 12 x 2TB disks, in a zpool configured as two raidz2 vdevs of six disks each. One ...
2
votes
2answers
124 views

Why does a ZFS resilver scan the entire pool?

I have a zpool where I have just replaced a failed disk, and started a resilvering to the new disk. What I don't understand is, why zpool status says it want to scan 129TB, when the size of the vdev ...
3
votes
1answer
50 views

zpool disappears whenever solaris cluster reboot or power cycle

I have following setup Oracle Solaris 10 -> 5.10 Generic_147147-26 sun4v sparc Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit production Oracle Solaris Cluster 3.3u2 for Solaris ...
0
votes
0answers
77 views

External USB disks on FreeNAS

I have a WD external USB disk (it is new), that works just fine on Linux with ext4 filesystem, but then when I use on FreeNAS and mount the ZFS volume I get error while writing into it. ...
0
votes
0answers
21 views

Solaris 10 inherit group write on ACL

I'm trying to get group write permissions to be inherited in Solaris 10. It isn't working. I've set aclinherit and aclmode to passthrough using zfs set. Unfortunately, a group@:w...:deny rule is ...
1
vote
0answers
64 views

smbd processes in uninterruptable sleep

I have fileserver running FreeBSD 10.1. The server's storage consists of two HDDs in a mirrored ZFS pool. This server is running Samba 4.1, as domain member. The domain controller is running on ...
1
vote
0answers
79 views

ZFS (Solaris 11) - SAS controller died & was replaced - pool is suspended

(Note I will amend with zpool status for clarity, when I return to the server) I have a 6x2TB disk raidz2 ZFS pool which I am hosting in Solaris 11 My original M1015 (flashed to IT mode) installed 2 ...
-1
votes
1answer
38 views

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 ...
0
votes
1answer
38 views

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 ? ...
1
vote
1answer
43 views

ZFS, mdconfig, GELI and getting my head around

I want to create an encrypted virtual disk but I am struggling with understanding some basic concepts. Please correct me if any of these statements are wrong: I need a block device that geli can ...
0
votes
0answers
45 views

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 ...
1
vote
1answer
108 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 ...
2
votes
2answers
234 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 ...
1
vote
2answers
251 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 ...
5
votes
1answer
202 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 ...
0
votes
2answers
98 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 ...
1
vote
1answer
80 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 ...
6
votes
1answer
279 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 | ...
3
votes
1answer
241 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, ...
0
votes
1answer
132 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 ...
0
votes
2answers
50 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 ...
1
vote
2answers
135 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 ...
1
vote
1answer
76 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 ...
2
votes
2answers
245 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) ...
1
vote
1answer
38 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 ...
0
votes
1answer
131 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: ...
3
votes
1answer
38 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 ...
0
votes
0answers
126 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 ...
1
vote
0answers
82 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 ...
0
votes
2answers
49 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 ...
4
votes
1answer
195 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, ...
1
vote
1answer
769 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. ...
1
vote
1answer
1k 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 ...
1
vote
2answers
481 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 ...