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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6
votes
1answer
171 views

Extreme ZFS slowdowns after several months

I've got a general-purpose server, providing mail, DNS, web, databases, and some other services for a number of users. It's got a Xeon E3-1275 at 3.40 GHz, 16 GB ECC RAM. Running Linux kernel 4.2.3, ...
9
votes
6answers
3k views

File size with zfs compression

I usually estimate the size of a whole directory tree using du -ks $DIRECTOY_TREE_ROOT, but this method cannot be used when zfs compression is on. The total displayed by ls -l is ok for a single ...
5
votes
3answers
870 views

ZFS, raidz1: Why is the volume size (42T) so much smaller than the pool size (50T)?

I have a pool of 28 2TB-disks (56T) in 4 arrays of 7 disks. Since it's raidz1 (~RAID5), I'd expect 1 disk to be used for parity in each array, so the resulting volume should be 2TB*4*(7-1)=48TB, ...
1
vote
2answers
49 views

How can I determine the performance penalty of VT-d vs. baremetal?

I am looking to configure my server in a slight odd way to create a private cloud setup. I have to take the HBA that my storage disks are tied to and pass it into a VM (probably xen) to allow the ...
3
votes
1answer
1k views

ZFS, NFS and Nexenta

Is this message familiar to someone ? zfs-clu-01a rpcmod: [ID 851375 kern.warning] WARNING: svc_cots_kdup no slots free zfs-clu-01a last message repeated 75220 times We have a lot of trouble ...
5
votes
2answers
4k views

zpool import: volume FAULTED with corrupted data, is it possible to save some data?

I was using Freenas 8.2 and decided to upgrade to 9.2. All seem to go well, upgraded zfs to 28 and rebooted. During next boot it seem to take forever and at some point I decided to turn off the ...
-1
votes
1answer
25 views

ZFS in JBOD mode - coping with single drive failure

I want to run ZFS on my small office server. The server is on a tight budget and I have to make do with the hardware (drives) I got, meaning they are all of different size and model. What I want is ...
5
votes
4answers
3k views

How to run a command once a ZFS scrub *completes*?

I would like to use cron to schedule periodic scrubs of my ZFS pool, and at some reasonably short time after the scrub finishes, email a status report to myself. The purpose of this is to catch any ...
1
vote
2answers
52 views

Does the max-80%-use target suggested for ZFS for performance reasons apply to SSD-backed pools?

The Solaris ZFS Best Practices Guide recommends keeping ZFS pool utilization below 80% for best performance: Keep pool space under 80% utilization to maintain pool performance. Currently, pool ...
0
votes
1answer
57 views

ZFS: i/o error - all block copies unavailable

I am trying to install FreeBSD Sparc64 on my SunFire440 machine, I followed the tutorials to Install FreeBSD Root on ZFS using this tutorial link. Only the changes I made is that instead of using ...
-2
votes
1answer
15 views

OpenSolaris/OpenIndiana drive full, cannot boot

While downloading my drive became full and now it is non booting. I installed a new drive in the workstation then installed exactly the same OS. I am now trying to go about a simple way of ...
3
votes
3answers
66 views

Weird ZFS performance with 4K pool block size?

I'm starting to look at ZFS, doing tests with FreeNAS on an old HP MicroServer (N40L). Didn't get extra RAM yet so it's only running with 2 GB, so pretty much no cache. I created a pool on a single 1 ...
3
votes
1answer
60 views

Broken ACLs when “zfs send”ing a snapshot from a Linux machine to Solaris

I'm running ZFS on a Ubuntu machine that hosts our home directories. The pool has the following ACL setting: # zfs get all homes | grep acl homes aclinherit restricted default ...
2
votes
1answer
6k views

FreeNAS, Do I need 1GB per TB of usable storage, or 1GB of memory per TB of physical disc?

The title says it all. When setting up free NAS, do I need 1GB per TB of usable storage, or 1GB of memory per TB of physical disc?
3
votes
1answer
49 views

recover data from zfs pool on napp-it openIndiana [closed]

I just inherited a desktop PC with napp-it free (openIndiana), it was set up to work as a sort of NAS, it had two disks on 2TB and one 3TB without any redundancy, one of the drives failed and the pool ...
0
votes
0answers
24 views

Wrong permission when accessing ZFS snapshot over NFS (Solaris server, Ubuntu client)

TL;DR: I don't understand why I can access one file but not an other (in the same directory), although they appear to have identical permissions. I have an NFS server running Solaris 10 10/08 and a ...
0
votes
2answers
1k views

FreeBSD 10: NFS unable to export folder

I am unable to export a folder using NFS. /etc/exports /storage/test -maproot=nobody client /storage/test1 -ro -maproot=nobody client /storage/test2 -ro -maproot=nobody client The first folder ...
2
votes
1answer
5k views

ZFS import unable to find any pools

I had a ZFS pool -- a mirror containing 2 vdevs -- running on a FreeBSD server. I now have only one of the disks from the mirror, and I am trying to recover files from it. The ZFS data sits in a GPT ...
3
votes
2answers
339 views

ZFS 100TB hardware setup

We received a quote for the following server setup : Intel Xeon E5-2609V2 2 x WD RE 2TB SATA III 34 x WD RE 4TB SAS II 32 GB memory (ECC) LSI MegaRAID 9271-8i bulk, 8 x SATA III/SAS II internal ...
6
votes
1answer
56 views

ZFS keeps faulting the same device

Our storage server has some problems, just ago we had a broken disk (WD 4TB RE SAS), though the raidcontroller (LSI MegaRAID 9271-8i) kept the disk online (status : ok). Only Media error showed 1 ...
1
vote
3answers
3k views

How to successfully compile lsof on Solaris 10?

The pre-compiled packages of lsof for Solaris (e.g. from Blastwave or sunfreeware) do not show the ports open, such as when using the options : "-Pni". The wisdom of the creator of lsof is that we ...
1
vote
1answer
1k views

Ubuntu client can't mount Nexenta NFS

I have a Nexenta storage box (Solaris), which exports an NFS share. Mac OS X and older Ubuntu clients can mount the NFS share just fine without any special options. Later version of Ubuntu simply ...
0
votes
0answers
45 views

Xenserver 6.5 (Open Source) VDI per ISCSI LUN (ZFS ZVOL)

In Xenserver 6.5 (open source edition) I want to create VMs with VDIs that are actually iSCSI LUNs shared by a CentOS 7 SAN which are in fact ZFS ZVOLS (the last part should not matter). My problem ...
4
votes
3answers
18k 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 ...
1
vote
2answers
207 views

zpool forgot all data devices of a pool: how to bring them online again?

My Debian server is running ZFS on Linux. Today I had to reboot it two times due to software upgrades. A first reboot because of ZFS update from some 0.6.4-1.2-1-wheezy to 0.6.5.2-2-wheezy, which went ...
5
votes
4answers
11k views

How to determine which disk failed in a FreeNAS / ZFS setup

I'm building out a FreeNAS based server in a Supermicro X6DHE-XB 3U enclosure with 4G of RAM, 16 SATA hot-swap bays. It comes with 2x8 port 3Ware RAID cards, but I'm planning on just using the ZFS ...
2
votes
0answers
34 views

Expanding JBOD with SAS extenders

My project is expanding 24-HDD ZFS box by adding 45-drive box with option to add another 45-drive box later (all are JBODs). Host box (24 HDDs) is Supermicro with single port expander backplane and ...
7
votes
3answers
15k views

How do I recover from a faulted zpool where one device is OK, but was temporarily offline?

I have a zpool with 4 2TB USB disks in a raidz config: [root@chef /mnt/Chef]# zpool status farcryz1 pool: farcryz1 state: ONLINE scrub: none requested config: NAME STATE READ ...
1
vote
1answer
50 views

Access iSCSI block device, setup as ZFS volume on CentOS7 - won't automount on boot, hangs on reboot

I am running CentOS7 on a virtual instance at Softlayer. There is a block storage device available to the instance via multipath/iscsi I have successfully had this block device mounted as XFS. I ...
4
votes
6answers
8k views

MegaRAID JBOD substitute

It seems that certain MegaRAID chips don't support JBOD (unfortunately). I've read online that to make these controllers act as a pass-through, I should configure the disks in RAID0. What RAID0 ...
2
votes
5answers
582 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 ...
11
votes
2answers
12k views

Transparent compression filesystem in conjunction with ext4

I am trying to test a project that needs compressed storage with use of the ext4 file system since the application I use relies on ext4 features. Are there any production/stable solutions out there ...
13
votes
2answers
12k views

For L2ARC and ZIL: is it better to have one large SSD for both, or two smaller SSDs?

Main references ZFS L2ARC (Brendan Gregg) (2008-07-22) and ZFS and the Hybrid Storage Concept (Anatol Studler's Blog) (2008-11-11) include the following diagram: Question Should I interpret the ...
9
votes
4answers
15k views

Moving a ZFS filesystem from one pool to another

I am extending a Solaris 10 U8 server with an extra storage pool in addition to the root rpool. What is the most effective / simple / reliable way of moving particular ZFS filesystem(s) from rpool to ...
135
votes
2answers
25k views

What are the different widely used RAID levels and when should I consider them?

This is a Canonical Question about RAID levels. What are: the RAID levels typically used (including the RAID-Z family)? deployments are they commonly found in? benefits and pitfalls of each? ...
0
votes
0answers
35 views

Destroying zfs dataset, migrating data to parent dataset

I have these zfs datasets: pool1 pool1/ds_parent pool1/ds_parent/ds1 pool1/ds_parent/ds2 pool1/ds_other I want to keep all data which is now contained in the datasets ds1 and ds2, but I don't want ...
1
vote
1answer
55 views

ZFS on a single external HDD drive: setup / tutorial and workflow [closed]

There are many tutorials on ZFS but I couldn't find a single one which covers the changes in commands when one uses only a single drive. I know by now that the parameter copies=2 is used but what ...
1
vote
1answer
556 views

How to migrate a regular LXC container to a Proxmox LXC container?

How do you migrate a regular LXC container (from another or the same server) to a Proxmox LXC container, which can be accessed via the Proxmox web GUI? For example, I have a container created by ...
0
votes
1answer
62 views

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 ...
1
vote
2answers
431 views

ZFS on enterprise RAID pass-through, and ZFS on FreeBSD root

We've been running ZFS on top of a single hardware RAID on dell poweredge for years. I know most people are against this, but the snapshot/clone, compression and flexible partition of ZFS served us ...
2
votes
0answers
27 views

Grow ZFS pool to use the whole disk

What's the (if there's any) way to grow a zfs pool that only uses a disk partially to use the whole disk? Background is, zfs is used here on a virtual machine and the Virtual machines disk has been ...
0
votes
0answers
29 views

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 ...
9
votes
6answers
8k views

ZFS Like Alternatives on Windows

Conceptually, and I don't think I am alone here, I love the concepts of ZFS. You can create one big disk, everything is stored on multiple drives, and you can grow and shrink the pool and drive at ...
4
votes
2answers
9k views

How do I add a second disk to my zfs root pool

I am trying to add a new disk to my zfs root pool. Here is my current config: # zpool status pool: rpool state: ONLINE scrub: none requested config: NAME STATE READ WRITE CKSUM ...
3
votes
1answer
95 views

ZFS Performance 80% rule

Does the 80% capacity rule of thumb for ZFS pools apply regardless of the size of the pool? If I have a pool of 10TB, that means I have to keep 2TB free. Fair enough, the loss isn't too great. But in ...
1
vote
1answer
92 views

zfsonlinux, raidz1: two disk corruptions: How I can use dd/dd_rescue and deceive zpool?

I have zfsonlinux (Centos 7), and raidz1. And I have trouble: two disks are dying. The first disk have Raw_Read_Error_Rate failure in SMART and Reallocated_Sector_Ct error (the disk has run out of ...
1
vote
2answers
51 views

Does hot spare limit write speed in ZFS?

Let's say I have a ZFS pool with a fast SSD and I want to add a magnetic hot spare. Will the pool slow down to the hot spare's speed?
0
votes
2answers
438 views

How to find files with top io on solaris ZFS?

I have a Solaris 10 ZFS based NFS server. The physical disks are more or less at their maximum io rates. Performance is very bad - so we will add spindles. The NFS solely serves as storage for ...
2
votes
1answer
94 views

ZFS pool slow sequential read

I have a related question about this problem, but it got too complicated and too big, so I decided I should split up the issue into NFS and local issues. I have also tried asking about this on the ...
2
votes
2answers
192 views

ZFS Datasets dissappear on reboot

I have installed ZFS(0.6.5) in my Centos 7 and I have also created a zpool, everything works fine apart from the fact that my datasets disappear on reboot. I have been trying to debug this issue with ...